I~\)~

IIItIIII

PIO,ECT NAMf:

mLE:

£.OMSTAFF PROPRIETARY LIMITED

INTERIM REPORT 00 THE RAMSAY ARE!EL 5/63 PART 2

096001

"REA NAME/S. STATE 1: 250,000 SHEff NOtS • COORDINATES:

Tin Tungsten Copper Lead Zinc

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COMMODITYliES:

TfXT P"CES NO:

ftAN NOS,

TAiU NOS:

AUTHOR/!':

DATI:

35

as detailed

14

G F pigott

April 1980

•Burnie Sheet S 55/3Metric co-ordinate 5397500 372500E

AUSTRALIAN ANGLO AMERICAN LIMITED

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CONTENTS

IN'rRODUCTION

LOCATION AND ACCESS

PREVIOUS WORK

WORK COMPLETED

4.1 Geological Investigations4.2 Geochemical Surveys4. 3 . Geophysical Surveys4.4 Statistics

GEOLOGY

5.1 Lithologies5.2 Structure5.3 Metamorphism

GEOCflEMISTRY OF STREAMS

6.1 Tin6.2 Lead6.3 COpper6.4 Zinc6.5 Nickel

GEOPHYSICS

INPUT FOLLOW UP GRID CAE

e.l Geologye.2 Geochemistrye.3 Geophysicse.4 Anomalous Responses

INPUT FOLLOW UP GRID CAL

9.1 Geology9.2 Geochemistry9.3 Geophysics9.4 Anomalous Responses

INPUT FOLLOW UP GRID CAF

10.1 Geology10.2 Geochemistry10.3 Geophysics10.4 Anomalous responses

INPUT FOLLOW UP GRID CAJ

11.1 Geology11.2 Geochemistry11.3 Geophysics11.4 Anomalous Responses

RECOMMENDATIONS AND WORK PROPOSALS

REFERENCES

LIST OF PLANS

096002ILt- J.-1"

Page No

1

1

1

2

3

11

14

15

19

22

27

29

34

35

APPENDIX 1

APPENDIX 2

APPENDIX 3

APPENDIX 4

WORK PROPOSALS

ROCK ANALYSES

PETROLOGICAL REPORTS

SOIL SAMPLE STATISTICS

IIII

096003

INTERIM REPOR'!' ON TIlE RAMSAY ARI!:A EL 5/63 PM'!' 2

1. IN'1'ROIlUC'l'ION

'rIlis report reviews the ""'rk carried out in the R.....ay Area (EL 5/63

Part 2) during 1979. The area concerned ia outlined on Plan TAS 2/1799.

Following a review ot previous "",rk carried out in this area, the 1979

work progr........ is outlined. A resume of the geology ia followed by the

presentation of results from the regional stream sediment sample surveys.

Then· the geology qeochemistry and geophysics of the input follow up grids

are presented and put into a regional context. A summary of results

achieved with proposals for further work concludes the report.

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2.

3.

LOCATION AND ACCESS

The area under review forms the western sector of EL 5/63 Part 2

(Plan TAS 2/1799). The northern boundary of which lies 10lcm south west

of Waratah. Acces.. i .. provided by a four wheel drive track from the

Corinna-Waratah Highltay. This track progressed 13 Jan to CAP and was

..topped at the onset of winter. Walking tracks were constructed to give

access to the grids CAE and CAJ. Access to the eastern sector of the

area is provided by a four Jan track from the Associated Forest Holdings

road (Hstfield Road) •

PREVIOUS WORK

The southern part of the Ramsay River and some of its tributaries were

geologically mapped and sediment sampled during the 1971/1972 Summer

Field Sesson (Rugless 1972). 'rIlis (1979) work follows on from that

programme to some extent. Rugless's geological observations have been

confirmed particularly that of his recognition of two distinct sequences

in the Ramsay River group of rocks.

The area was included

anomalies identified.

in the Input E-M survey of 1975 and a number of

Two of the anomalies CAB and CAI were followed up

but in both cases no firm conclusions as to their importance or

significance were formed. CAB lies on part of the wow grid and has

been confirmed on the qround by anomalous geochemical responses and a

minor crone E-M response. CAI lies on part of the Ott creek Grid but

its position on the ground is doubtful. An Input follow up grid was

established to find CAI on the ground but it appears to have been cut

too far to the north. However a strongly positive crone E-I'I response

was found associated with anomaloua Cu, Zn aoil geochemistry on the grid •

• • •2.

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096004

2.

4. 1iORK COMPLETED

4.1 Geological Inve.tigations

Access tracks, sections of the Ramsay River and selected creeks

were geoloqically mapped. All grid lines and tie lines were

m_apped utilising rock chips brought up by hand auger aampling.

Appropriate rock samples were submitted for petrological

description from their sections and for geochemical analysis.

4.2 Geochemical Surveys

Stream sediment sample values obtained from previous surveys were

plotted on the 1 : 5000 base sheets. This highlighted areas of

poor coverage and drew attention to areas of anomalously high

values. Sediment sampling on this programme was designed to

fill in and to follow up the previous results. Sediment from

the active stream channels and base of slope soil samples were

collected. C horiz:on auger samples were collected from the Input

follow up grids except CAJ. This was con.idered to be the most

appropriate soil sampling method as there are no glacial deposits

and the relief on some of the grid lines is high. Ao samples

were collected on CAJ as some of the grid is overlain by Quaternary

sediments. A portion of the Ramsay access track was channel sampled•

4.3 GeophYsical Surveys

The po.itions of the Input anomalies in the Ramsay area were

checked by the photoqeoloqist (M.H.) following some doubts as to the

accuracy of the 1 : 5000 base plans in the region. The positions

were replotted On more recent aerial photographs (1978) using the

original flight strip negative.. The anomalies were positioned on

the ground using tape and compass surwey data combined with aerial

photo interpretations.

Input follow up grid. were established at CAE CAL CAF and CAJ.

Crone E-M and proton procession magnetometer surveys were used

to locate the anomalous sources.

4.4 Statistics

Geological MappingThin section analysesRock geochemical analysesstream sediment samplesBa.e of slope soil samplesSOil samplesGrid lines cutAccess tracks bulldozedwalking tracks cut

tracks ,grid25 samples72 samples

237 samples129 !lamples856 samples19620 m17080 m3450 m

lines and creeks ­45,050 metres

•.• 3.

• - - - - - - - - - - - - -TABLE 1

AGE NAME UNIT TIIl:CKNESS LJ:'l'WLOGJ:ES

Ouarternary AlluviUlll 0 - 10 m Boulder and cobble gravel, sand

Tertiary Basalt 0 - 25 Alkali olivine basalt, basal qravel,sand.

f--- -- -- -- -- -- -- -'- -- -- -- __ .L.-unconformity -- -- -- -- -- -- -

Upper Devonian

to Meredith Granite

Lower Carboniferous

I-- -- -- -- -- -- -- -,.. -- -- -- -- -r-- intrusive -- -- -- -- -- --Crimson Creel< Basic to intermediate volcaniclastic

Lower Cambrian Formation Greywacl<e Sequence 800 - 1200+ m greywacke, tuff. siltstone 7 argillite;pelite (possibly dolomitic); cherticonqlam.erate 1 minor basic sills, dyl<eslavas.

f--- -- -- -- -- -- -- - -- -- -- -- -~ unconformi ty -- -- -- -- -- -- --.

upper Proterozoic Ramsay Group Sandstone/Shale 800+ m Carbonaceous sandstone, phyllite andSequence shale, micaceous sandstone, siltstone;

conglomerate; breccia; carbonate.

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096006

3.

5. G1!X>LOGY

The rOCKS in the Ramsay area may be grouped into quite different discrete

sequences (see Table 1), dependi~ on lithology, degree of deformation,

and age relationship. The interpreted distribution of these sequences

is sho~ on plan TAB 2/2029, 2030 and 2031. These plan. were compiled

from the 1 : 5000 field maps on which all geological observations are

recorded. The detailed geology of the various grids are shown on

separate plans, CAE on Plan TAB 2/2099, CAL on Plan TAB 2/2100,

CAF on Plan TAB 2/2101 and CAJ on Plan TAB 2/2102.

5.1 Lithologies

Ramsay Group. RoCKS of the Ramsay Group outcrop in the Ramsay

River Val1.ey and underly sections of Grids CAE CAL and CAJ. The

Group consists of darK grey carbOnaceous phyllite, metasiltstone and

shale; micaceous semi pelite and peUte; micaceous qusrtz wacke and

psamm1te, feldspathic ssndstone and siltstone. Generally the rocks

are thinly bedded with soft sediment deformation, scour and fill

texture and rhythmic bedding developed. The lower part of the

group has undergone two, possibly three, periods of deformation,

and is strongly cleaved.

The upper part of the Ramsay Group, below its contact with the

crimson creek Form,ation, includes carbonate and conglomerate units.

Calc silicate rocks with interstitial sulphideS and secondary

goethite have been mapped on grid CAL and east of CAF. The rocks

are heaVily metasOlllatised with relict features obliterated, but

with a faint banding barely recognisable. They are made up of matted

and granular aggregates of calc silicate minerals mainly tremolite

and diopside with minor sphene, feldspar and quartz. COarse angUlar

conglomerate has been mapped in situ and as float. The uppermost

unit of the Ramsay Group where exposed in OsbOrne Creel< is an

argillite-chert-quartzite co~lomeratewith minor sulphides (Pyrite)

in a siliceous matrix. Float of pyritised conglomerate has been

mapped in the Ramsay River north of CAL. It consists of poorly sorted

pebbles of pyritic quartzite and carbOnaceous meta siltstone in a

siliceous matri~ with interstitial pyrite/marcasite. In Green

Creel< float of gossanous shale breccia has been recorded from this

contact zone.

• •. 4.

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096007

4.

The Ramsay Group is regarded as being Upper Proterozoic (possibly

to Lower cambrian) in age. and although poly folded in sections.

the rocks are relatively unmetamorphoaed. The rock sequence is

comparable to the Bischoff series exposed at Mount Bischoff and

to the Oonagh Formation exposed west of Renison Bell. It reselllbles

the Success creek Group in li thologies but not in degree of

deformation. 'file Ramsay Group therefore may be regarded as

forming part of ths Proterozoic basement to the C~ian Dundas

Trough and is expesed' in the Ramsay Valley as an inlier similar to

those which occur at Mt Dundas and Mt Bischoff. Its relationship

to the Success creek Group is not clear. Recent 1Ilepping by

GeOlogical Survey GeOlogists north of Renison Bell indicatea that

the Success creek Group is the earliest trough unit and it rests

unconformably on rocks of the Oonagh Formation (A. Brown personal

co....unication). Rocks similar to those of the Success creek Group

outcrop north of Rosebery in. the Rosebery Group - n81llely the Stitt

Quartzite. These rocka may represent shelf-type shallow water

facies which fo~ed at the bsse of and marginal to the fault

controlled. rapidly subsiding Dundas Trough (Pigott 1978). It is

quite possible that rocks of the Success creek Group are represented

at Ramsay below the boundary with the crimson creek Formation. but

because of the similarity of lithologies it has not yet proved

possible to distinguish them.

Crimson creek Formation. Rocks of the crimson Creek Formation

form a thick unfossiliferous succession of basic to intermediate

volcaniclastic greywacke. tuff. siltstone. argillite. calc silicate

pelite. chert and conglomerate with basaltic sills dykes and lavas.

Overall there appears to be sn increase in the propcrtion of basic

rocks from north to south with a progressive increase in grain

size. In the northern part of the area the CeIlIbrian sedilllents are

predominantly flat lying to steeply dipping fine grained homogenous

siltstone and argillite with interslratified tuffaceous sandstone.

The rocks are finely bedded to well laminated. Southwards the

sequence is predominantly made up of tuffaceous greywacke (or

SUbaqueous tuff)which forms distinctive fine grained grey-black.

poorly sorted labile clastic units. They are predominantly

tremolitic rocks follOwing the effects of regional green schist

metamorphism. commonly the clastic rocks are magnetic due to the

presence of detrital magnetite. The c~ian sediments at CAF

comprise interlayered volcano1llict sandstone. basic tuff. basic lithic

wacke. argillite. siltstone and pelite. Further to the south at CAJ

the sequence includes basaltic lava. mLcrodolerite and basic tuff.

IIIIIII

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0960085.

Fine grained, predominantly argillaceous, units occur within the

greywacke sequence at CAL and CAP. They comprise pelite, meta

do~te, breccia, chert,acid tuff and meta -siltstone. Characteris­

tically the rocks are finely bedded, brecciatted and are heavily

metasomatised. The rocks are thought to be meta dolomites or at

least semi calcareous and as such represent quite a different

facies from the turbiditic sequences. There is, in addition,

evidence from thin section examination that there is an acid

volcanic component in interlayered bands. Fine grained tourmaline

(dravite) is a COlDIDCn sccessory mineral in these fine grained rocks.

Essentially the rock sequence is similar to that mspped in the

Renison Bell area as crimson creek Formation and is therefore

assigned to it on the basis of correlation by lithology. The

tremolitic tuffaceous greywacke units resemble the Deep Creek

"tuffs" mapped at Cleveland as being the footwall rocks to the ore

bearing horizon,

Meredith Granite. The emplacement of the post kinematic Meredith

granite pluton took place in the Late Devonian - Early Carboniferous.

It appears to be a composite intrusive complex with adamellite asthe major rock type. The level of intrusion is thought to be deep

subvolcanic. No associated acid volcanic rocks are known but there

are numerous porphyritic dykes in the Proterozoic and Cambrian

sediments of the region.

Although the granite has not been studied in detail, three facies

have aO far been recognised:-

Feldspar - biotite granite: this varies from being densely

porphyritic to being coarsely crystalline in texture. It

forms the main granite type mapped at Mount Ramsay and on the

main access track south from the South Bischoff Mine. It is

composed of phenocrysts of potash feldspar and quartz in a

matrix of plagioclese, quartz and biotite. Biotite pheno­

crysts up to 10% of the rock may be present.

PprphyritipAdamollite: this varies from being fine grained

with very scattered phenocrysts to containing 50% phenocrysts

in a medium grained matrix. It occurs north of Wombat Flats,

at the South Bischoff Mine and along the contact with the

sediments on Mount Ramsay. The phenocryst phases inclUde

potash feldspar! quartz ~ biotite, and are set in a fine

••• 6.

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0960096.

to medium grained homogenous quartz-plagioclese-biotite

matrix. The potash feldspar phenocrysts are subhedral to

anhedral and are randomly arranged. The qqartz phenocrysts

are less common and are anhedral to ovoid in shape. The

relative proportion and type of phenocryst phases sa well aa

the proportion of matrix feldspar are both sUbject to randomvariation.

Microgranite: this is a fine to medium grained non

. porphyritic granite. It occurs on the road north of Wombat

Flats and as minor dykes east of the South Bischoff Mine.

It is a homogenous granite with an aplitic texture.

Tourmaline and quartz aggregates OCCUr within particular

zones in this rock type. The tourmaline fills joints and

fracture surfacea and displays a radially pseudo-dendritichabit.

Tertiary Basalt. The Tertiary Basalt cover is not as extensive

as first thought. Basalts and gravels do occur within ths areas

outlined but are somewhat intermittently developsd. The thickest

deposits with the most Widespread development occur over the

granite-sediment contact zone north of CAB, across the headWaters

of Green Creek and into the Ramsay River. In the area south of

Wombat Flats Tertiary rocks occur on a thin veneer of boulders

and cobbles set in red clay or as deposits infilling pre Tertiary

topographic lows. The underlying Cambrain sedimentary rocks are

often exposed in road cuttings and creek beds. Drainage and soil

samples collected from such areas probably accurately reflect the

elemental values in these underlying rocks.

The typical Tertiary basalt is grey to black in colour and exhibits

marked textural and mineralogical variations. It is an alkali olivine

basalt which has a fine grained homogeneous matrix and is often

sporadically vesiculated. Feldspar and olivine are generally

represented as phenocrysts, and a pr imary flow fa bric can be

distinguished by the orientation of the feldspars •. Amygdales

contain cryptocrystalline quarts, chlorite, carbonate and clay

mineral. Rarely observed are olivine megacryste and quartz xenoliths

with complex reaction rims. AcCeSS~ry fine grained magnetite is

common giving the rock measurable magnetic propsrties.

,. •• 7.

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0960107.

Quaternary Alluvium. Deposits of sands and gravels occur in

the area, mainly over the Meredith granite but also in sections

alonq the major water courses. These have acted as trap aites

for heavy mineral concentrates such as cassiterite. They form as

poorly sorted deposits with boulders and cobbles in a sandy matrix.

The limited depth and aereal extent of these deposits preclude them

from forming viable exploration targets.

5.2· Structure

The area mapped Ues along the western limb of a major snticline.

Rock units in both the Ramsay Group and the crimson Creek Formation

dip and face west. The inlier of Upper Proterozoic rocks occupies the

axial zone of this anticline. These rocks were affected by the

Penguin orogeny - a late Proterozoic period of deformation (Rugless

1972) which folded the units on N-S axes. Only one period of

deformation - the Tabberabberan Orogeny - affected the overlying

Cambrian rocks. This major orogeny is dated as between Early and

Middle Devonian and produced the main fold and fault patterns in

the area. The main trend is northwest to north north west.

This phase of deformation was followed by the emplace.....nt of the

Meredith Granite which was accompanied by brittle fracturing of

the deformed sedimentary envelope. It is quite likely that the

emplacement of the Granite was structurally controlled. A major

crustal weakness probably occurred at the western margin of the

fault controlled Dundas Trough which would have allowed a rapid

rise of granitoid columns to a high crustal level.

This brittle fracture pattern gives rise to a large number of

lineaments and fault blocks. Many of the contacts between

different lithologies and sequences are fault controlled. North

north west, north and north north eastern trends predominate

with associated northeast, east and southeast tension fractures.

Reference to the photogeological interpretation (Plans TAS 2/2026­

2028) indicate that the granite contact zone is strongly fracture

controlled as far south as CAF. This may account for the general

absence of granitisation or high temperature metamorphic effects

in the sedimentary rocks adjacent to the granite.

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096011

B.

The intensity of fracturing together with the fact that

generally the beds dip and face into the granite make the

eastern contact zone with the granite highly prospective.

Pault structures. bedding planes and fold axes could have acted

as conduits for hydrothermal mineralising fluids While porous

or chemically reactive units could hoet replacement mineralisation.

5.3 Hetamorphi.m

The effects of dynamic and thermal metamorphism are wideapread in

the area ....pped. The ubiquitous develo~nt of mica in rocks of

the Ramsay Group may have resulted from regional metamorphism

during the Penguin Orogeny. The only possible contact metamorphic

effects noted in these rocks are the intensity of quartz veins

and the development of fine dravita. Tourmaline is a common

aceeBBary mineral in carbonaceous micaceous quartz arenite units,

but is also seen to occur in veins and fractures. Purther aouth.

in the area yet to be mapped in detail east of CAP. tourmalinisation

is more widespread. There,interlayered argillaceous units contain

fine crystalline green tourmaline which can form up to 60% of the

rock. Tourmaline also occurs within quartz sandstone units as fine

grained green crystals concentrated in bunches and stringers.

There is therefore an apparent increaae in probable contact

metamorphic effects within the Ramsay Group from north to south

apparently reaching a maximum development east of CAP.

The rocks of the Crimson Creek Pormation are pervasively

metamorphosed. and like those of the Ramsay Group. show an increase

in grade from north to south. Insufficient samples have been

collected for metamorphic isogrades to be drawn. But the

metamorphic assemblages clearly depend on the bulk chemistry of

the rock and therefore vary according to rock type. Overall

however the mineral assemblages formed under conditions of upper

greenschist to lower amphibolite facies. The main rock types -

the basic tuffaceous greywackes, are extensively tremolitised. In

the northern part of the area mapped the contact with the granite

is almost ''1<nif8 edge" sharp with no apparent increase in metamorphic

grade. The rocks are dense with few persisting primary features

and consist of tremolite with minor talc. saussurite. csrbortate.albite

biotite and magnetite. Further south. w.st of CAE. similar rock

types. adjacent to the granite are s.en as biotite-tremolite hornfels.

The biotite content is 10% but the rock also contains albite. and

•. . 9.

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096012

9.

patches of chlorite. These are medium grade (albite-amphibolite

facies) contact metamorphic rocks. The greywackes on CAP are

similar being generally massive albite and/or cordierite-biotite­

tremolite hornfels.

Pelitic rocks. on the other hand. contain variable mineral

ass_blaqes. The argillites and siltstones. which may be

considered as fine silty-pelitic equivalents of the tuffaceous

qreywackes. show little evidence of contact metamorphism where

mapped north of CAE. except for fibrous patches and veins of

amphibole. On CAP such rocks are seen as spotted slates composed

of cordierite and biotite. Relict bedding is well preserved mainly

due to the presence of thin chert layers.

Units of pelitic dolomites have been mapped on grids CAL and CAP.

These rocks have undergone fairly intense metasomatic replacement.

on CAL the rocks consist of fine calc-silicate minerals mainly

tremolite and diopside with tourmaline and sulphides. Similar

mineral assemblages have been mapped on CAF in dolomitic units

IOOOln from the granite contact. However where a dolomitic pelite

is in contact with the granite a banded complex mafic-calc-silicate

hornfels is developed. These skarn rocks on CAF represent the

highest grade of metamorphism yet seen in the area. The mineral

assemblage represents an upper amphibolite facies within the contact

metamorphic aureole. The calc silicate minerals are predominantly

diopside with cordierite. albite quartz and epidote. More mafic

bands or layers consist predominantly of hornblende with magnetite

snd pyrrhotite. while interstitial fluorite and tourmaline suggest

a partly pneumatolytic genesis.

Pneumatolytic modifications of the granitic rocks include a)

greisening b) tourmalisization and c) argillisation.

a) Greiseninq. Greisens are not extensively de~eloped in the

Ramsay Area a Muscovi te grei sen occurs in the porphyritic

adamellite in the granite cOntact zone on CAP. Its distribution

has not yet been mapped in detai I but it does appear to be

confined to this granite type which at CAP is a contact

injection phase. Further north on the road at CAL the rocks

are partially granitised along fracture planes. Other frscture

controlled greisen zones are exposed at a number of stations

along the Ramsay Road. typically on a north north-western trend.

They consist of anhedral patches of quartz with aggregates of

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IIIIIIIIIIIIIIII••

09601310.

hydromuscovite. Brown to 9reen chlorite qreisens occur at the

South Bischoff Mine and at Cundy's Mine north of wombat Flats.

They are structurally controlled with sharp contacts against

the enveloping granite, which in both cases is porphyritic

.granite. The sulphide-cassiterite mineralisation at these

mines is apparently confined to the greissoised rocks.

b) Tourmalinisation. Tourmaline mineralisation is fairly wide­

spread along the eastern contact zone of the Meredith Granite.

Generally it occurs as an aceessary mineral, ae aqqreqates

filling joints, or as veins. Distinctive black and white

quartz-tourmaline rocks ocCur On the access road west of CAE

(Home Track), the south west corner of CAL and on CAF. The

tourmaline occurs characteristically as radial aggregates of

black needle-like crystals (schorl). On the road at Home Track

this style of mineralisation is pervasive but dies out north

and south into discrete dyke like masses. At CAL it is

closely associated with muscovite greisenisation giving rise to

vuggy quartz-tourmaline-muscovite rocks. Sections of the raod

from 6480 m to 12640 m were channel sampled to test if

casserite mineralisation was associated with the tourmaline.

The results are listed in Appendix 2. certainly on the road no

sn values of interest were recorded. The highest W value of

90 ppm comes from a 20 m channel sample l1760-l1780m in an area

where anomalous soil responses have been recorded.

Quartz tourmaline mineralisation occurs along the granite contact

on CAF. It appears to be a separate last stage pneumatolytic

phase. Veins, dykes and pod like masses occur in the skarn

rocks and within the porphyritic adamellite. Analyses of grab

samples collected from outcrops indicate that no mineraliaation

of economic significance is associated with them. The rocks

simply represent massive, pervasive quartz-tourmaline mineral­

isation which post dates the qreisen and skarn development.

c) Kaolinization. Argillisation and the formation of clay

minerals appears to be fairly restricted in this area. It

occurs at the granite marqins exposed alonq the main access road,

over short widths. The most widespread development is seen on

the road north of CAF from 12494-1258Om. The rock consists of

kaolin, sericite and quartz and is cut by ferruginous quartz­

tourmaline veins. Channel samples through the zone did not

indicate cassiterite, wolfram or sulphide mineralisation .

• • • 11.

IIIIIIII

I

09601411.

6. GEX>CH~STRY OF STREAMS

The results from the stream sediment sampling have been assessed. The

integration of values from samples collected on previous surveys with

those obtained from samples carried out during this programme proved

difficult in some cases. Problems arose due to the imperfect knowledge

of sample locations and by the different analytical techniques used.

Old and new values are distinguished on the 1 : 5000 base sheets. but

are grouped for statistical appraisals and selection of anomalous zones.

Table 2 below gives the statistical break down of the values and lists

the critical points observed from cumulative frequency curveS.

TABLE 2

Stream Sediment Sample Statistics

Range of Mean Standard No.oeviationElement Values <m) (0'> 111+2 Critical Points Sample

Sn 0 - 1080 74.76 93.88 262.5 42. 85, 150 498

Pb 5 - 76 23.45 15.42 54.3 54 308

CU "5 - 170 34.26 22.35 79.0 75 410

Zn 5 - 470 89.49 52.44 194.4 49, 160. 295 406

Ni 2 - 285 71.39 54.10 179.6 160 395

AnomalOUS sample petterns are shown on plan TAS 2/2032-2034.

6.1 lli

A large number of sediment samples collected in the Wombat Flats

area were only analysed for Sn. This means that there are more

sample results for appraisal, and a greater coverage than for the

other elements. Tin was analysed by colorimetric techniques on

the previous programme and this method realised lower values than

the currently used XRF technique.

A number of anomalous tin zones may be derived from a stUdy of the

can be satisfactorily related to the regional geology and seem to

indicate several prospective areast-

II

data. These are designated on the appropriate plans. The zones

a) Main Zone. A clearly defined "'one of anomalous patterns 1IIay be

traced northwards from CAE, through Green Creek the Ramsay River

and on to the creeks south east of Wombat Flats. The patterns

sre associated with the Ramsay Group-Crimson Creek Formation

••• 12.

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096015

12.

contact zone and indicate that Sn mineralisation may be present.

The upper part of the Ramsay Group with congloDlerates and

calcareous rocks and the lower part of the crimeon creek

Formation coDtprisinq dolomitic argillites and pelites could

fOrDI a suitable zone for the formation of replsc8Dl8nt cassiterite

sulphide mineralisation. The fact that this prospective contact

zone gives rise to Sn anomalous patterns makes follow up work in

the area a matter of some priority.

b) Eastern ZOne. A recognisable anomalous zone oeeurs east of the

Main Zone. It may be traced froDl CAE northwards slong the

R....say River and tributaries. The anomalous values in the river

east of CAE may be due to concentrations within the Quaternary

al1uvium~ otherwise the zone maybe associated with calc silicate

rocks within the R....say Group. The main Ramsay River samples

have a generally higher Pb content than the tributary samples.

and the eu values overall are higher than those in the Main

Zone.

c) Western Zone. A distinct zone of anomalous patterns may be

traced fram west of CAE. through Green creek and northwards

into the Ramsay River. These patterna are considered to be of

leaser priority than those above. Some have associated

anomalous base metal values in eu and Pb and may have their

aource in rocks of the Crimson creek FOrDIation currently

covered by Tertiary Basalt. Other anomalous values with

coincident Ni may be associated with the base of the Tertiary

Basalt itself. and could represent alluvial concentrations within

gravel and sand.

d) South Bischoff Area. The area incorporating the South Bischoff

mine ""rkings is clearly anomalous in Sn. All creeks draining

the area contain enhanced Sn values including the highest yet

recorded. Obviously some of the high values are due to alluvial

concentrations but this sector of the granite is highlighted by

the results. The granite type over most of this zone is potash

feldspar-quartz porphyritic adamellite. Chlorite-muscovite

greisen occurs at the South Bischoff mine and is seen as

float in the creeks. Primary Sn minerslisation may be more

widespread in this area than was at first thought. There could

be. for example. Sn in pervasively greisenised or stockwork

veined sectionSa

'I1111I

•

IIIII

•

09601613.

Two other anomalous responses are of note:-

e) There is an anomalous value in a creek draining ~he Ramsay

Group rocka rior~ Bast of· CAL. This is considered to be of

conaequence because 1. it drsins ~e contact zone between

the Ramsay and crimson creek rocka and therefore forma a

8Ou~ern extenaion of the Main Tin ZOne (a) and 2. pyritic

conglomerate float has been mapped in the vicinity of the

anomalous value.

f) AnolIIalous valuea occur in the Ramsay River east of CAF. This

is the area' where the "Ramsay Gossan" has been mapped - a ma.s

of goethite and lilllCnite associated with an altered breccia or

conglomerate. The source of these values may either be 1. from

alluvial concentrations wi~in the Ouaternary sediments or 2.

from a primary source - possibly calc silicate rocks or frscture

zones on the weat side of the Ramsay Valley. The Ramsay Group ­

crimson creek Formation contact zone outcrops on these steep

weatern slopes and associated altered carbonate rocks have been

found containing sulphide mineralisation.

6.2

Analysis for Pb was not carried out on many of the previously

collected samplee. This means that much of the nor~ern part of the

area has not been adequately assessed. The only definitely anomalous

values occur in the "Ramsay Gossan" areal particularly in creeks

draining the eastern side of the Valley, and from a creek draining

the Ramsay Group- crilllson creek Formation contact zone north of CAL

(aince n2QUed Fu creek). The Pb anomalies at the "Ramsay Gossan"

may reflect a geochemical zonation around a hydrothermal source with

Sn passing east into Pb and Zn. The values in Fu creek are associated

with Zn and Cu in an area where basalts and basic tuffs have been

mapped•

6.3 Copper

NO definitely anomalous population can be defined from the ststistical

analysis but values over 75 ppm may be considered as possibly

anomalous. Enhanced values oocur associated with the Western Tin

Zone and with certain creeks draining rocks of the crimson creek

Formation. '!'he anomalous values in Howard Creek and in creeks 700 m

to the sou~ may indicate sulphide mineralisation. Harnfelsed

••. 14.

The Input

and CAJ.

ground.

Table 3.

t~IIIIII

II

14.

096017tuffaceous greywacke and altered basic rocks exposed on the

access road contain 5-10% sulphides. mainly pyrrhotite but also

chalcopyrite.andaeu value of 540 ppm has been recorded from a

rock analysis. However there are no associated Sn values.

Other anomalous values occur in samples from Gandalf Creek. A

simi lar source to that above is indicated. with the Crimson

Creek rocks here being basic tuffaceous greywackes containing

minor sulphides. Further south in Fu Creek the enhanced eu values

are associated with Pb and Zn.

6.4 Zinc

Only one definitely anomalous zn value of over 295 ppm has been

recorded. Thie occurs associated with the Pb ana.alies in a creek

draining the eastern side of the Ramsay Valley near the "Ramsay

Gossan". The possible significance of this value is mentioned in

6.2 above. Otherwise enhanced values occur in clos. association

with Ni.

6.5 Nickel

No definitely anomalous nickel values have been recorded. The

enhanced values that do occur are closely associated with Tertiary

Basalt. Evidently these are neither ultramafic bodies nor mafic

bodies outcropping in the area aampled associated with the

Proterozoic or Cam~ian rocks.

7. GEOPHYSICS

anomalies followed up on this survey were CAE(21. CAL CAF(2)

All anomalies except CAJ were successfully located on the

The details on the Input anomalies in the area are listed in

TABLE 3

Description of Input Anomalies

Flight Fiducial Channels Ratio Altitude M~netic8Anomaly Line Indicated Source

CAEN 248W 63.60 6 13/2.3 130m BOOnT Bedrock FairCAE S 247E 69.12 4 5/0.4 1BOm 20nT Bedrock PoorCAL 244E 132.40 6 B/l.3 130m 400nT Bedrock PoorCAFlf 241AE 215.55 4 3.5/0.3 135m 100nT Bedrock PoorCAF E 24IAE 215.B4 5 3/0.6 150m 350nT Bedrock PoorCAJ 237AE 017.84 6 4/1.0 215m 620nT Bedrock PoorCAl 234Alf 015.68 6 8/1.4 130m 160nT Bedrock FairCAM 234AW 016.97 5 2/0.3 200m n.r. Surficial PoorCAG 228AW 121.63 4 1.5/0.2 155m 30nT Surficial Poor

IIIIIII

IIIIIII

096018

15.

The plotted positions of the anomalies are shown on Plans TAS 2/2029-2031

along with. where applicable. the ground geophysical responses. At CAE.CAL

and· CAP the ground EM response is 100-15Om east of the Input anomalies.

At CAJ the ground response is west of the plotted Input anomaly. It is

possible that this anomaly lies further west. Poor flight recovery in

this area makes accurate positioning on the ground very difficult.

No anomalous drainage sample values occur in the vicinity of an Input

anomaly ... except in the cZlise of cAl.. 'Whi 1e the anOlllalouB Sn zones can

be satisfactorily related to geology their relationship to the Input

anomalies is not so clear. The Input responsea lie within Ramsay Group

or crimson creek Formation units in the vicinity of the contact zone. The

drainage anomalies occur along strike fr~ them suggesting that while the

prospective zones or facies may hsve been located. follow up work along

strike is required to locate the mineralisation.

8. INPU'r FOLLOW-UP GRID CAE

8.1 Geology (Plan TAS 2/2099)

Most of Grid CAE is underlain by rocka of the upper part of the

Ramsay Group. which here is inte:rpreted as belonging to the Success

Creek Group or its equivalent.

The geological mapping established the presence of the Success

Creek Group - Crimson creek Formation contact zone, which here is

considered to bean unconformity. It may be traced northwards

through Green creek. and southwards beyond CAL into the Ramsay Itt-rer.

Massively bedded quartzite with interbedded carbonaceous quartz

sandstone and phyllites outcrop in the Ramsay River and on the

eastern portion of the grid. These rock typea pass west into flaggy

micaceous quartz sandstone, siltstone and carbonaceous phyllites

with interlensed pyritic carbonaceous shales. Facing directions.

Cleavage bedding relationships and sedimentary structures indicate

that the sequence faces and dips to the west but is tightly

isoclinally folded. The change from massive to flaggy micaceous

rocks may not only be due to differing sedimentary facies. i.e. the

onset of a turbidite style of deposition hut also may reflect a

higher grade of metamorphism.

The western section of the gridded araa is underlain by hornfalsed

graded tuffaceous greywacke. siltstone and argillite. The rocks are

extensively recrystallised. so much so that the bedding is virtually

obscured. hut clearly belong to the crimson Creek Formation. and

comprise a turbidite sequence with basic volcaniclastics.16

The proximity of the Meredith Granite is illustrated by the

hornfelsic nature of the rocks and by the presence of minor

veins of phlogopi te-actinoli te with arsenopyrite. chalcopyrite

and pyrite. The Crimson Creek rocks being essentially of

bssic composition were readily recrystallised within the granite

aureole. but there is no evidence of tourmalinisation.

The contact between the Success Creek GrOUp and the Crimson Creek

Formation is not exposed either On the grid lines nor in the

creeks but can be positioned fairly accurately by inference from

mapping and ground magnetics. In Green Creek north of CAE the

lowermost rocks of the crimson creek Formation are seen as

magnetic basic volcanics. Floaters of gossanous breccia and

chert-argillite conglomerate have been observed which may indicate

a basal clastic facies. The gossanous rock comprises pink

argillite. chert and quartz angular clasts in a matrix made up of

silica. 7 carbonate and oxidised sulphides. A similar rock has

been observed in the 'Ramsay River south from CAL, and south east

from wombat Flats alluvial mine.

I~~

IIIIIIII

16. 096019

IIII

IIII

8.2 Geochemistry

The C horizon soil samples were analysed for Cu Pb Zn and Sn.

The results are presented as profiles on sections (Plan TAS2/1825­

1827. 1829-1830 and 1927) and on Plan (TAS 2/2050-2053). Contour

intervals were selected from a statistical apprsisal (Appendix 4)

and from cumulative frequency plots. The patterns were defined

from a stUdy of the stacked profiles.

The geochemical pattern over rocks of tbe Ramsay Group are quite

distinct from those over the Crimson Creek Formation. This difference

in responses may be considered as diagnostic of the contact zone

between the two groups of rock units.

Sn (Plan TAS 2/2053): Values over 12 ppm may be regarded as

anomalous. The only anomalous response on the grid occurs over part

of the Ramsay alluvial channel and is probably due to secondary

concentrations. A high response occurs in -sample collected on

HOme Track (Plan TAS 2/1927). This may reflect Sn mineralisation

and requires checking.

••• 17 •

]

IIIII

096020

17.

CU : The value may be grouped into three populations (Plan

TAS 2/2050). An anomalous pattern is apparent in the southwest

section of the grid, where the high values are coincident with

zn. In this area Crimson Creek magnetic greywackes and volcanic­

lasticshave been mapped with phlogopite-actinolite veins carrying

minor pyrite and pyrrhotite. The CU values probably reflect the

high background values of these rocks.

The anomaly in line 5240N is coincident with enhanced Pb and Zn

values but requires checking as the values appear to be unusually

low over the Crimson Creek rocks on this line. The anomalous

response at the eastern end of line 5000N cannot readily be

explained. There may be a concentration of quartz veining in this

area and there ia evidence of a north west trending fault structure

cutting the rocks from the photogeological study (Plan TAS 2/2027).

IIIIII

~: Values over 56 ppm may be regarded as being anomalous

(Plan TAB 2/2051). The few high values are diSpersed Over the grid

but the patterns appear to be controlled by lithologies. Cerbonaceous

pyritic shale units in the Ramsay Group give rise to anomalous

patterns which may be traced from line to line.

~ : The values may be grouped into three populations (Plan TAB

2/2052). They ar~ closely sympathetic with Cu. The populations

reflect different bedrock chemistry with the lowest values occurring

over rocks of the Ramsay Group and the higher valuea occurring over

rocks of the Crimson Creek Formation. AB with CU. attention ia

drawn to the south west sector of the grid. to the anomaly on line

5240N and to the response at the eastern end of line 5000N.

8. 3 Geophysics

The ground magnetic traverses over the CAE grid clearly illustrate

the Succeas Creek Group - Crimson Creek FOrmation boundary (Plan

TAS 2/1806). The magnetic signature of the quartzites and shales

is a consistant plateau while that of the turbidites and volcanic­

lastics is erratic with a higher background. The contact is marked

by an anomalous low adjacent to an anomalous high. Thia pattern is

similar to that obaerved at the aenison Bell mine where it is

regarded as diagnostic of the "Msrker Horizon" which contains the

stratabound dolomitic ore bodies.

• •• 18.

IIIIIIIIIIII

096021

18.

Crone anomalies are seen on these lines (Plan TAS 2/1902) Ion

5240N at 4950£

5l20N at 4980£

and on 5000N at 5025£

forming a distinct EM anomalous zone. The lSOurce is regarded as

a -good conductor, clearly locating the two Input anomalies. The

dip direction on the two northern lines is to the east with ao

magnitude of over 50. The best response is on line 5240N where

the conductor appears to be at a depth of 30m or leu. The source

may have a southward plunge since the amplitudes decrease to the

south.

8.4 Anomalous Responses

The Crone anomaly on line 5240N is supported by anomalous Pb Zn

and Cu in the soil samples but has no associated ground magnetic

response. It lies within rocks of the upper part of the Ramsay

Group east of the contact zone with the Crimsol\ Creek Formation.

The anomalous soil sample values do not extend to the lines on

either side, and there is no evidence of an anomalous fN response

on the line to the north. Photogeological evidence indicates the

existence of an east-west fault traversing the grid in this area.

Such a fault could truncate the EM anomaly, while associated fault

controlled mineralisation could be reflected in the soil values.

The magnetic response at the Ramsay Group - crimson Creek Formation

boundary is distinctly anomalous, but may be formational. There

are no EM or soil sample anomalies associated with it. Because of

its similarity to the Renison Bell mine sequence, this contact

zone, particularly Where this magnetic pattern occurs, must be

regarded as highly prospective for cassiterite-sulphide mineral­

isation.

The cu/Zn soil anomaly in the BOuth west sector of the grid is

probably due to the higher background chemistry in the rocks

(Section 8.2 above). This also accounts for the Cu anomaly in

the stream sediment samples collected in Gandalf Creek.

• • . 19.

IIIIIII

IIII

09602219.

9. INPtrr f'9I.!.QW UP GRIp CAl.

9.1 Geology (Plan TAS 2/2100)

Grid CAL has been established over the Ramsay Group - crimson

creek Formation and crimson Creek Formation - Meredith Granite

contact zones. The granite in this area outcrops within 350m

·of the Ramsay Group rocks. The sedimentary units lie within the

contact metamorphic aureole of the granite and are tourmalised

with concentrations of tourmaline in the pelites and calcareous

argi11ites.

!tenured dips on outcrops at CAL indicate that the rock sequence

dips and faces west into the granite. The rocks exposed at the

eastern end of the grid comprise carbonaceous phyllite. micaceous

semi pelite. carbonaceous quartzite and pyritic quartz psammite.

The rocks are cleaved and contorted. and the sequence is assigned

to the upper part of the Ramsay Group. Westwards below the

crimson creek Formation contsct sequence passes up into a 10-3Om

wide carbonate sub-facies made up of massive to faintly layered

aggregates of tremolite and diopside with pyrrhotite. arsenopyrite.

prehnite. sphene and siderite which cDllll1lOnly envelo~s the sulphides.

Clastic te ures are barely recognisable. but together with the

abundant fine grained sulphides and the magnetic property serve to

distinguish the rocks in the field. It required thin section

examination to identify the rocks as carbonates.

To the west the basal section of the overlying crimson Creek

FOrmation comprises essentially fine qrained, sometimes laminated,

metasomatised argillite and siltstone. Conglomerates are exposed

to the south in Osmond creek. This sequence paues up into

metasomatised fine to medium grained tuffaceous greywackes with

interlensed argillites and siltstones. typical of the Crimson creek

Formation. Within this sequence units of heavily altered fine

grained rocks have been mapped. These comprise finely bedded

metadolo~te, pelite, breccia, met880matised chert, acid tuff and

flow banded acid (1) lava. There is pervasive hydrothermal alter­

ations within these rocks with extensive replacement by diopside.

tremolite. tourmaline and sulphides. Similar rock sequences are

expcsed on CAF (see below). There may be only the one unit of

this type on CAL folded into a northerly plunging asymmetric

syncline.

• •• 20.

IIIIIIIIII

096023

20.

The contact between the Crimson Creek Formation and the granite is

not exposed but may be interpreted from the vegetation and drainage

pattern. The granite is mainly holocrystalline and is a coatse

grained biotite-feldspar-quartz assemblage. The feldspar is predom­

in8I1tly plagioclase so it may be a granodiorite. however. there are

few mafic minerals. Quartz-tourmaline schorl with sulphide veins

is exposed on the road. the contact zone generally is moderately

tourmalinised.

The dolomitic pelite horizon. apparently forming a fold-noee in the

narrow portion of Crimson Creek Formation rocks containa up to 10%

sUlphides - pyrrhotite. pyrite and arsenopyrite. Although there is

no evidence of cassiterite mineralisation it is considered that this

horizon is similar to the host rocks at the Cleveland mine which also

appear to be within a fine grained calcareous facies segment of the

Crimson Creek Formation.

9.2 Goochemi,try

The C horizon soil samples Were analysed for Cu Pb Zn Sn and W while

samples collected over possibly mineralised horizons were also

analysed for As. The results are plotted as profiles on sections

(Plans TAS 2/1821-1824) and on plans (Plans TAS 2/2045-2049). Contour

intervals were selected fram cumulative frequency plots and from

statistical analysis of the data (Appendix 4).

Rock sample analyses indicate that the base metal contents are fairly

low (Appendix 2) although As is clearly anomalous due to the presence

of arsenopyrite •

.in ' (Plan TAS 2/2048) The soil values may be grouped into three

populations 0-12. 13-43 and greater than 43 ppm. Values greater than

43 ppm are definitely anomalous. There is a clearly defined soil

anomaly at the west end of 4760N over greisenised and tourmslinised

granite. The -road in this area was channel sampled but no anomalOUS

values were recorded, suggesting that the zone cuts out sharply to

the west, and dies out to the north.

An anomalous pattern of Sn soil responses occurs at the eastern end

of the grid. This may be formational as it overlie. rocks of the

Upper part of the Ramsay Group.

• •• 21.

IIIIIIIIII..

9.3

09602421.

~ : (Plan TAB 2/2049) Tungsten valuea in the soils are generally

low with most below the limit of detection. There is a definitely

anomalous response coincident with the Sn anomaly at the western

end of line 476ON.

~ ,- (Plan TAB 2/2045) No definitely anomalous value. were recorded.

The values may be grouped into three populations 0-30 ppo over the

granite; 31 - 100 ppm over the greywacke. and Ramsay Group sandstones,

greater than 100 ppm over the meta dolomites and pelite units within

the Crimson Creek Formation. An enhanced Cu response occurs on all

grid lines along the granite contact with the sediments. There is

a possibly anomalous pattern of Cu values coincident with the crone

and ground magnetic anomalies on the three northern lines.

.Bl , (Plan TAS 2/2046) Anomalous Pb values are aesociated with the crone­

ground magnetic anomaly in line 5l20N and with the SnM anomaly in the

south west section of the grid.

All , (Plan TAS 2/2047) The Zn patterns are similar to Cu. The

lowest population 0-27 PPO occurs over the granite. Definitely

anomalous values, greater than 370 ppm occur associated with the

SnM/Pb anomaly at the western end of 4760N and coincident with the

crone/ground magnetic anomaly on 5l20N•

Geophysics.

The ground magnetic patterns are quite different from those seen on

CAE (Plan TAS 2/1900). The magnetic signature of the granite is

typically flat while tbet of the Crimson Creek rocks to the east is

erratic with a high background. The characteristic pattern over the

Ramsay Group/Crimson creek Formation boundary ,sone seen on CAE is not

seen here. It may be that the grid lines do not extend far enough

eastwards. for the baCKground response over the Ramsay Group to be

measured.

There are two zones of anomalous magnetic patterns. The western zone

is coincident with the Crone anomaly where disseminated pyrrhotite has

been mapped in the hornfelsed greywackes and pelites. The eastern

response occurs over the basal Crtmson Creek unit., again where

pyrrhotite has been mapped as concentrations in tuffaceous and

arenaceous beds. Here however there is no associated EM response and

no anomalous geochemistry.

• •• 22.

I

096025

A distinct Crone anomaly is seen on three lines (Plan TAS 2/1901) I

on

forming a distinct zone which is almost coincident with the

inter~eted fold axis. in the dolomitic pelite unit. The anomaly

amplitude decreases northward. which indicates a northward plunge.

The interpreted depth of burial on line 5120N is 40m and the dip is

600 to the east. The response on line 51200 is coincident with a

definite Cu/Pb/Zn geochemical anomaly and with an anomalous ground

magnetic response.

IIII

and on

48800

5000H

51200

at 5040£

at 5040£

at 5030E

I•

9.4 AOpmflous Besponses

The Crone anomaly with coincident ground magnetic and geochemical

responses. particularly on line 5l20N is a potential drill target.

It appears to be associated with a dolomitic pelite unit which

forms a tight aaymmetric fold in the Crimson Creek Formation. The

rocks are hornfelsed.metasomatised and contain sulphides (up to 10%

modal content). However there is no evidence of Sn mineralisation

either in the rock or soU sample values. It may be that Sn is

developed within the zone to the north as there is an obvious increase

in the geochemical response from south to north, and pyritised mineralised

conglomerate float has been mapped in the Ramsay River north of the grid.

The strongly anomalous Sn/W/Pb/Zn soil anomaly at the western end of

line 47600 has no related magnetic or EM response (Plan ~S 2/18211.

Sulphide veins within greisenised and tourmalinised granite is the

suspected sourCe as indicated on the road. However the proximity

of earbonate rocks within the crimson creek Formation does not preclude

the development of skarns in this area. Follow up sampling and mapping

are required to investigate this anomaly to the south •

10. INpuT FOLLOW UP GRID CAF

10.1 Geology (Plan TAS 2/2101)

Grid CAF is underlain by Crimson Creek Formation rock sequences in

contact with the Meredith Granite. It lies west of the Ramsay Group ­

Crimson Creek Formation contact ZOne. The Crimson Creek sequence

consists of basic volcanoclastic greywacke. siltstone and argillite

with tuff and interbedded pelite. Measured dips and facing directions

indicate that the rock sequence dips and faces westwards into the

granite but there is some drag folding and faUlting. Two horizons of

••• 23

somewhat different facies have been mapped within the greywacke

sequence and they comprise fine grained meta-siltstone, argillite and

pelite with acid tuff and chert intercalations. The eastern most unit

is heavily silicified and contains calc silicate minerals indicative

of calcareous rocks. This unit is interpreted as being within 100m

of the Ramsay Group - crimson Creek Formation contact. A metadolerite

sill or altered intermediate lava is associated with these rocks and

outcrops on the three northern lines and on the tie line.

I~~

IIII

23. 096026

IIIII.....II

A dyke of leuco adamellite cuts the sequence. It has been mapped on

the access road and on line 52405. There appears to be no mineral­

isation associated with it. The granite over the western sector of

the grid is mainly coarse grained non porphyritic and holocrystalline

but towards the contact with the sediment it is fine grained and

porphyritic. A distinct potash feldspar porphyry occurs along this

contact. It is heavily tourmalinised in parts (See section 5.3 b» and

is patchily greisenised.

A zone of muscovite greiaen, quartz tourmaline mineralieation and

magnetite-amphibolite skarn development may be traced through the grid

along the granite-sediment contact. Outcrop within the zone is poor

and is best seen in a southward draining creek near line 488ON. It is

characterised by a well defined magnetic response which strangely waa

not located on the airborne survey•

On line 4760N these rocks are mapped between 4370E and 44l0E in a

thickly vegetated swampy gully. Float of magnetite veined and banded

amphibolised sediment, banded pyroxene hornfels, quartz-tourmaline

vein material and muscovite greiaen have been observed. On 4880N

outcrops and float material occur between 43008 and 4420E comprising

coarse crystalline amphibolite skarn. bornblendite, fine grained

brecciated banded pelite. banded siliceous-magnetite skarn. quartz

tourmaline veins and greiaen.

The rock mapped as skarn was confirmed as such by thin section

examination. (Appendix 3) A sample collected from CAF 48805/4360E

is described as a thinly banded complex mafic-calc-silicate hornfels,

with altered cordierite. epidote. diopeide hornblende. interstitisl

fluorite, accessary sphene, tourmaline, trace ? zeolite, minor pyrite,

pyrrhotite and msgnetite. The petrologist (I.R. Pontifex) regards the

rock as being a contact metamorphosed sediment. either of argillaceous

chloritic dolomitic and/or fine basic tuff facies. He adds that the

rock represents the highest grade of metamorphism seen in the rocks

submitted for examination.

• •• 24.

The zone appears to be truncated by a fault north of 5000N but

may be traced through a number of old workings northwards to

line 5240N as a narrow (30m) unit of mainly greisen and quartz­

tourmaline. However it remains open ended to the south. Tin

and tungsten geochemical anomalies with coincident high copper

values occur over the skarn but there is no recognisable EM

effect. Samples were collected from the old workings for

examination and analyses. Pyrrhotite is the main sulphide

species present with minor Chalcopyrite and pyrite. Magnetite is

usually seen as coarse qranular veins. particularly in the

coarse amphibolitic rocks. Rock analyses indicate anomalous Sn W

and eu values. F was not analysed but is probably high. The

mineral originally sought in this area was probably cassiterite

but it probably has a greater potential for tungsten mineralisation.

IIIII

24. 096027

1I

III-

10.2 Geochemistry

All e horizon soil samples were analysed for Cu Pb Zn Sn and W

While those collected over the qranite contact zone were also

analysed for Au and Bi. The results are plotted as profiles on

sections (Plans TAS 2/185l-1856). The geochemical patterns were

interpreted by appraising the data on the stacked profiles and

incorporating a statistical anslysis with cumulative frequency plots

(Appendix 4).

Base metal values over the grid are low with the exception of the

skarn zone. This issomeWhat surprising as pyrrhotite and pyrite

are common accessary minerals throughout the sedimentary rock

sequence •

.§D. , (Plan TAS 2/2038) The Sn soil values can be divided into

three popUlations: - 0-10. 11-35. greater than 35 ppm. The skarn

zone. particularly on lines 4880N and on 5000N. gives rise to

anomalous responses over a maximum width of 100m (Plsns TAS 2/1851­

1853).

!!: , (Plan TAS 2/2039) The W soil values can also be divided into

three populations 0-10. 11-48. greater than 48 ppm. Apart from

some scattered sporadic enhanced values, anomalous responses are

confined to the skarn/greisen zone. The W soil anomaly coincides

directly with the Sn soil anomaly (Plans TAS 2/1851-1853). indicating

that if Sn and W mineralisation is the source then it occurs in the

same rock units.

• •• 25.

IIIIIIII

IIII

0960282S.

~ , (Plan TAS 2/203S) NO definitely anomalous values were

recorded and the cumulative frequency curve is very siGdlar to

that for CAL. Four populations may be discerned from the values

0-24. 2S-42 , 43-8S and greater than 8S ppm. The 24 ppm contour

outlines the boundary of the granite with the sediments on lines

SOOON northwarde to S360N. and the edge of the skarn zone on

lines 4760N northwards to SOOON, A series of trough and ridge

patterns may be traced from line to line. The patt..rn near the

access road may reflect minor chalcopyrite mineralisation in

pelitic rock units.

Pb , (Plan TAS 2/2036) Although three populations may be defined

from the values viz, 0-11, 12-90 and greater than 90 Ppm1 no

anomalies occur. The pattern is quite different than CAL. Like

Cu. the value appears to occur in' ridge and trough like patterns

in the Crimson creek rocks.

~ , (Plan TAS 2/2037) Four populations may be discerned in the

values, 0-14, lS-37, 38-140 and greater than 140 ppm. The

distribution and patterns of values are similar to those for CU.

The 37 ppm contour outlines the granite margin. Otherwise like

CU and to some extent Pb, the values fall into a series of ridges

and tro'O.ghs over the sedimentary sequence.

10.3 Geophysics

A substantial qround magnetic anomaly occurs over the skarn zone on

lines 4760N, 4880N and SOOON. The source of this effect can be

readily explained by the content of pyrrhotite and magnetite within

these rocks. East of the skarn zone two somewhat disjointed zones

of anomalous magnetic responses may be traced through the grid

(Plan T~S 2/1898). The central magnetic anomaly directly coincides

with the EM conductor On lines 4760N and 4880N but persists

northwards past the EM location to line S120N. It appears to be

displaced westwards about 150m on this line and increases in

amplitude to the north until itis truncated at the edge of the

granite. The tuffaceous greywackes which form the major rock type

in this zone include pyrrhotite concentrations beth in bedded

layers and in cross cutting fractures. So this pyrrhotite may be

regarded as being the cause of the magnetic response. The

displacement on line S120N may be' due to an east north east trending

fault with a sinistral displacement.

• •• 26.

III

09602926.

The magnetic pattern in the eastern magnetic zone 1s more

disjointed. There does appear to be some correlation with the

EM conductor on line 4760N but it is displaced to the east on

line 4880N. The displacement between lines 5000N and 5240N may

be due to the crOss cutting sinistral fault mentioned above.

Minor to trace amounts of pyrrhotite in amphobilitic patches and

veins have been mapped through this zone and are the probable

cause of the anomalies.

and open to the south.

The cAP (west) anonaly is evident in the crone responses on the

two most southern lines at (Plan TAB 2/1899) ,III

48l0E on line

4820E on line

4880N

4760N

IIII

The source is within 10m of the surface, has a near vertical dip

and is over 20m in width. There is a direct correlation of

magnetic response with the EM conductor suggesting that pyrrhotite

mineralisation is the source. However there are no associated

geochemical effects seen either in the soil (plans TAB 2/1851-1852)

or rock (Appendix 2) values.

The cAF (east) anomaly is seen as the Crone responses on the same

lines to the east (Plan TAB 2/1899) at:

and open to the south.

10.4 Anomalous Responses

The responses are less distinctive than those at cAF(W) but have

a sindlar pattern. The errattc nature of the magnetic results

precludes a reliable analysis of their effects. Again pyrrhotite

appears to be the most likely source of the geophysical effects.

IIII

52l0E on line

5240E on line

4880N

4760N

IIII

The zone of skarn and greisen along the granite/sediment contact

on cAF form a high priority target. The coincidence of strongly

anomalous Sn and W soil values with substatial grouDd magnetic

effects is suggestive of mineralisation, which, within such a

geological setting. could be of economic grades. If the source

of the anomalies can be shown to be scheelite (with or without

••• 27.

27. 096030

IIIIIIIII

cassiterite) with sulphides. then diamond drilling must be

carried out as the next step in evalution of the zone.

The source of both EM anomalies needs determination. Although

interpreted as being close to surface. the absence of geochemical

effects does not suggest economic grades of mineralisation. It

is possible that these anomalies. if they extend to the south

may improve in prospectivity. If pyrrhotite alone is the source.

it could pass. either with depth or along strike. into a different

style which might contain Sn or eu minerals.

11. INPUT FOLLOW UP GRID CAJ

11.1 Geology (Plan TAB 2/2102)

Grid CAJ is established over the contact between the Ramssy Group

and the crimson creek Formation. This contact appears. in part

to be faulted. between lines 4880N and SOOON. Much of the esstern

section of the grid is overlain with fluvial sediment which

restricts the outcrop of the Ramsay Group. Outcrop over the

western section of the grid is good. The older rocks comprise

carbonaceous quartz sandstone and siltstone, quartz pelite and

semi pelite. quartz-feldspathic sandstone and black carbonaceous

shale. The contact with the crimson creek rocks is not exposed

and is not revealed bY any geochemical or geophysical features.

The crimson creek rocks comprise tuffaceous greywacke. basic tuff.

microdolerite and argillite. NO evidence of chert or carbonate

sediments has been found. Only trace amounts of sulphide mineral­

isation were observed - mainly pyrrhotite in the basic rocks.

Ilone of the rock units are strongly metamorphosed. The pyroxenes

in the m1crodolerites have not been tremolitised and the rocks are

not hornfelsed. However minor amounts of muscovite and tourmaline

occur in the Ramsay Group quartz sandstones.

IIIII

ll.2 Geochemistry

The Ao horizon soil samples were analysed for eu Pb Zn Bn and Ni.

The results are plotted as profiles on sections (Plans TAB 2/1893­

1896). The results may be subdivided into populations based on

a statistical analysis of the dsta (Appendix 4) and on cumulative

frequency plots.

110 anomalous sample values in the elements analysed were recorded.

••• 28.

28.096031

IIIIII

I

Sn : (Plan TAS 2/2043) The values fall into three populations

0-17, 18-24, and greater than 24 ppm. One sample is possibly

anomalous with an isolated value of 35 ppm at 4760N/4790E.

CU : (Plan TAS 2/2040). Three population groups may be distinguished

0-26, 26-74 and greater than 74 ppm. The patterns are similar. to

those for Zn and Ni and appear to define the Crimson Creek basic

units.

Pb : (Plan TAS 2/2041). Only two populations are apparent 0-42 PPm

and greater than 42 ppm. There is. overall, a higher background in

value over the Crimson Creek rock units with a slight build up at

the contact.

!!!. : (Plan TAS 2/2042). The values may be divided into three

populations:- 0-40. 41-79 and greater than 79 ppm. The 41 ppm

contour delineates the eastern boundary of the crimson Creek

Formation. Otherwise the pattern of values is siDdlar to those

for Ni.

11.3 Geophysics

into three populations 0-23. 24-68 and greater than 68 ppm. The

lowest values are recorded over the alluvium and Ramsay Group.

Higher values may indicate basic units within the Crimson Creek

Formation.

III

~ : (Plan TAS 2/2044). As with eu and Zn the values may be divided

II

No snomalous magnetic responses were recorded (Plan TAS 2/1891).

The CAJ Input response is a major conductor on the eastern flank

of an aeromagnetic anomaly. The absence of a ground magnetic

response indicates that the actual Input response has not been

located. It is suspected that it may be further to the west,

although this grid was established with a fair amount of confidence.

Ground EM anomalies were found on all four grid lines (Plan ~ 2/1892):-

at 4860E on line 5l20N

4860E on line SOOON

4860B on line 4880N

and at 4970E on line 4760N

••• 29.

IIIIII

IIII

096032

29.

The conductors dip steeply (plus 80 degrees) to the east and

are near surface at SOOON and 4760N. The we.tern conductor.

picked up on the three northern lines lies in Crimson Creek

rocks while the eastern one. On line 4760N is in rocks of th..

Ramsay Group. Both EM. anomalies are weak and have no aasociated

ground maqnetic or geochemical respons.... The nature of th..s..

conductors is not known ..

11.4 Anomalous Responses

The only anomalies found on this grid are the ground EM.

responses. However more gridding to the west and south is

required to establish if the Input anomaly hae been located or

not.

12. RECOMMENDATIONS AND WORK PROPOSALS

Vigorous follow-up work based on the results achieved to date is

recommended. The following proposals are listed in order of priority

(Plans TAS 2/2054.2055. 2056). Details are listed in Appendix I.

12.1 The indications of economic mineralisation at CAE and CAL should

be followed up in order to determine if diamond drilling is

warranted ..

12.1.1 The skarn zone at CAF should be examined by costeaning

and griddinq. The association of Sn. Wand eu soil

anomalies with qround magnetic responses and skarn

mineralogy indicates the possible presence of mineral­

isation. Outcrop on the three grid lines where these

responses occur is poor. The road to CAl should be

routed so as to expose a section through the zone. This

in effect will be a costean and should be channel sampled

and mapped. Three 6011\ spaced grid lines should be

established over the zone to carry out further sampling

and define its intensity and width. A grid line 12011\ to

the south of the present grid should be cut to trace for

an extension southwards (here 4640N).

Total grid lines : 128011\. tie lines : 12011\. costean:

estimate 100m. samples: roek 40. soil 68•

.... 30.

IIIIII

IIIII

096033

30.

12.1.2 The coincident crone EM and magnetic sanomalies on CAP

should be traced to the south. This could be achieved

by extending the proposed line 4640N to the east. This

line would also check the IlPparent southward displacement

of Input anomaly CAP (E) •

~ grid lines, 880m. tie lines: 240m. samples: 45.

12.1.3 It is proposed to extend grid cAL northwards to close

with grid CAE. Two grid lines CAL 5240N and 5480N

could be established from the Ramsay access track to the

Ramsay River, Geological. geochenti.cal and geophysical

data collected on these lines would

(a) test for the northern extension of the coincident

crone EM. ground magnetic and CU. Pb. Zn soil anomaly

found on CALI

Ib) determine the extent of the dolomitic pelite and

calc-silicate units which are mineralised on the

cAL grid,

Ie) trace the contact zone between the Ramsay and

Crimson Creek sequences northwards to CAE, the

probable source horizon of the pyritised conglomerate

float found in the Ramsay River at GlOom,

(d) locate the source of the anomalous Sn content in

the drainage.

In addition to these proposals two lines 120m apart should be

constructed to the SW of the CAL grid to investigate snd

follow up the anomalous geochemistry on line 4760N.

Total grid lines: 338Om. tie linee. 240m. samples: 174.

12.2 The sources of the anomalous Sn contents of the drainage samples

north of CAE need to be located. To this end it is proposed to

extend grid CAE northwards by six lines 240m apart. Data collected

on these lines would

(a) appraise the prospectivity of the ground drsined by creeks

with anomalous an contents1

(b) trace the contact zone between the Ramsay and crimson Creek

sequences to the north,

••• 31.

IIIIIj

IIIIIIII

096034

31.

(c) allow for further examination of the anomalous magnetic

responses found on the CAE grid:

(d) locate the source of the gossan float found in Green creek.

~ grid lines 468Om. tie lines 288Om. samples 234.

l2.3 'l'he Ralllsay access road should be continued to CAL 'l'his would

also give access to the southern part of the CAF grid and would

allow for geological mapping of the prospective granite contact

zone.

Approximate length of trace sooOm.

12.4 'l'he location of Input anomaly CAl should be established on the

ground. A six line grid is proposed, if possible interpreting

with the primary work carried out in the area. 'l'he lines should

be auger sampled, mapped and geophysical surveys carried out

(CRONE EM and Magnetics).

~ grid lines: 384Om. tie lines: 120Om, samples: 198.

12.5 'l'he prospectivity of the Ramsay gOSSatlS on the Ramsay River

should be established and the source of the anomalous Sn

content in the river located. There is evidence for the presence

of carbonate rocks in the area.

An unsurveyed grid was established in 1973-74 on the eastern

bank of the river, but it is considered that the more

prospective ground lies on the west bank.

It is proposed to extend grid CAF eastwards across the Ramsay

River. 'l'he initial grid spacing would be 240m. and the lines

lOOOm in length. Geological, geochemical and geophysical data

collected on these lines would

(a) cross the contact zone between the Ramsay and crimson

Creek rock sequences;

(b) locate the source of calc-silicate and carbonate rocks

found as float in the Ramsay River,

••• 32.

IIIIIIIIIIIIIIIIIII

09603532.

(c) locate the Ramsay qossans and put them in a regional

contextt

(d) prospect for the source of the sno"",lous sn and PI> stream

sediment samples I

(e) integrate with the work done previously on the old

Ramsay and Wow qrids.

Total qrid lines, 300Om, tie lines, 4BOm. samples, 153.

12.6 It appears that Input anomaly cAJ may not haqe been located on

the established follow-up qrid. Further work is necessary to

qalidate the grid location. Howeqer a ground EM responae was

located on the qrid and is open to the south. Further work

has been reCOlllllended by the qeophysicist (DM) to examine the

area ..

It is proposed to extend two of the qrid lines 500m westward

and establish a new line 120m south of 4760N to see if the

response at 4970E persists.

TOtal grid lines: l70Om, tie lines, 360m. samples: BB.

12.7 A qround magnetic surqey should be csrried out over Home Track

to examine the magnetic response west of the anomaly on the

western margin of grid CAE.

TOtal magnetics 100Om.

12.8 Geological mappinq. surveying and the collection of constant

volume panned concentrates is proposed for three sections of

the Ramsay River and for certain tributaries (see Plans TAS 2/2054,

2055 and 2056).

12.8.1 The Ramsay River south of Osborne Creek. to south of

CAJ should be mapped. This would integrate with

previous q8Ological mapping and allow for access to the

Ramsay gossans. The tributaries drsining the east bank

contain anomslous Pb so the source should be established.

The main tributaries draining the east bsnk contain

anomalous PI> so the source should be established. The

••• 33.

IIIIIIII

I

096036

33.

main tributaries draining the west bank north and south

of CAJ would \Jive cross sections through the Ramsay and

Crimson creek sequences, especially across the contact

zone between the two.

~ Map and survey. 8000ml panned concentrate•• 16.

12.8.2 Follow up geol09ical mapping and sampling ie recommended

for selected creeks which drain the tin zones north of

CAE. This work ""'uld support the effort on the grid lines.

Total msp and survey: 350Om. panned concentrates: 7.

12.8.3 The anomalous Sn contents of drainSlJe samples in the

northern reaches of the Ramsay should be followed up.

Sections of the river and main tributaries should be

prospected to locate the sources of Sn. This would also

allow for an understanding of the nature of the crimson

Creek-Granite contact zone. and could trace the contact

zone between the Ramsay and crimson Creek sequence to the

north. In addition prospecting along creeks in the Wombat

and SOuth Bischoff area. could locate sources of primary

an in the \Jranite.

Total map and survey. 6S0Om. panned concentrates. 13.

12.9 It is recommended that tin mineralisation in the SOuth Bischoff

area be examined and its extent established. To this end a three

line grid is proposed with lines 240m spsrt, The 0 ld "",rkings

should be located snd. if possible. sampled. A literature survey

could be undertaken to apprisse old records and maps. particularly

to learn of \Jrsdes mined. The number of old alluvial workings in

the area gives promise of a substantial primary source.

Total grid lines. 220Om, samples: 113.

12.10 It is proposed to geologically map the COldstream-Wow-Ramsay

access track and to tie the work in with previous grid lines,

costeans and drill holes in the area.

Total map: 400Om.

12.11 It is proposed to collate surface geological. geochemical and

geophysical data and borehole data: prepare regional and local

plans and sections I prepare ongoing "",rk proposals and requisite

reports.

I ~~'C

IIIIIII

I

09603734.

13 • REFERENCES

Central Mineralogical Services Pty Ltd (1979) Mineralogical Report

No. 79/6/17.

Pigott G.F. (1978) Interim Report on Renison East (Grid GAP).

Comstaff Pty Ltd

Pigott G.F. (1979) Ramsay Area Monthly Reports, COMstaff Pty Ltd

January - September.

Pontifex & Associates Pty Ltd (1979) Mineralogical Reports No. 2628

and 2662.

Rugless C.S. (1972) Ramsay Area Project 1971/1972 Summer Field

Saason Report, Comstaff Pty Ltd.

Report written byG.F. Pigott, Senior Geologist,

Tasmania

~,~­~bY

R.J. Kernick,Exploration Manager

""

"

"

/

"

"

"

"

"

"

..

"

"

....

..

..

..

..

..

..

1: 2.500

1: 0.000

1:250.0001, 50.0001: 10.000

096038

part 2)

""

""

"Sheet

Sheet 123

""

Home Track

CuPbZnSnW

..

..

CuPbZnSn

CuPbZnSnW

""

CuPbZnSnNi

1980 Sheet 123

""

"

""

"

"

""

"

"

"

""

•

"

based on stream sedimentsample results

35.

"

"

"

•

"

Proposed Work Programme"

"

"

""

""

"

"

geological interpretationcomposite section 4760N

4880N" sOOON" 5UON and" s240N" s360N

stacked magnetic profilesetacked Crone E-M profilesauger aample re.ults

geological interpretationcomposite section 4760N

" 4880N" sOOON" s120NII 5240NtI 5360N

stacked magnetic profilesstacked Crone E-M profilesauger sample results

geological interpretationcomposite section 4760N

" 4880NII SOOON" s120N

stacked magnetic profilesstacked Crone E-M profilesauger sample results

geological interpretationcomposite section 4760N

" 4880NII SOOONII 5120N

stacked magnetic profilesstacked Crone E-M profilesauger sample results

""

"

"

" II

"

"

"

"

"

"

"

"

"

"

"

It I.

"

"

"

•

"

"

"

""

• •

"

,. "

.. I.

"

"

II II

"

.. "

· "

Ramsay Area

Photogeological interpretation" "

Ramsay Grid CAE

Ramsay Grid CAL

Geochemical Anomalies

Ramsay Grid CAF

Ramsay Grid CAJ

Cornetaff Project Map Location of Ramsay Area (EL 5/63Ramsay Area outline of section sampled and mappedInterpretative Geology and Geophysical anomalies Sheet 1

23123

2029~03C

,2031,'2026,2027·20282032

2033'20342099'18251826··1827,192718291830'1806'1902,,2050205120522053­

'2100'1821·1822·1823,1824,19001901'2045204620472048

.20492101

·18511,852185318541855

. 1856'1898'1899,2035

, 2036'2037'2038'20392102,1893.18S ..·18951896

'189118922040

'2041, 2042, 2043-2044'2054• 2055"2056

2/1586·1799

TAB

14. LIST OF PLANS

\}OL If

VOLJTI:.

voLl

II

I

I

I

I

II

I

I

I

I

I

I

II

I

I

-l~

I

I

096039APPENDIX I

Details of Proposed WOrk - Ramsay Area 1980

I Access 1.2.

Refurbish Ramsay Access Track from highway to eM'Establish bulldozer track to Input anomsly CAl

l3080m5000m

I Costean along CAl rosd 100m

Extensions to e,tabli,hed grids

..

..

..

l200m320m320m320m

1000m1000m1000m

840m

..

..

61 samples171717515151

4640N 42002 - 5400E4700N 42002 - 4520E4940N 4200E - 452025060N 4200E - 452024760N 5400E - 6440E5000N 5440E 6440E5240N 54402 6440Etie lines

..

..

" II

II II

extension east

eM' extension southfill in

II

I

extension south

CAL extension northII

..

....

"

Total

5240N road to river5480N II

4520N 4680E - 5320E4640N 4680E 5320Etie line

265 samples 6000m

1000mllOOm

640m640m24011I

I Total 174 samples 362 Om

CA2 extension westextension northI

II

..

..".."

..

.."..

5360N5600N5840N6080N6320N6560N6800N

base

4560E ­4560E4560E ­4560E45602456024560E

and tie

468025320E5320E532025320E5320E53202

lines

Total

7 samples393939393939

241 samples

120m76011I760m760m760m760m760m

288011I

756011I

..II

~ extension ,outh 4640N 4650E - 5350Eextension west 4880N 4l50E 4650E

5000N 4l50E - 4650Ebase and tie lines

Total

36 samples2626

88 samples

70011I500m500m36011I

2060m

"

..

..

..

5040m

640m640m640m640m640m640m

1200m

33 samples3333333333

198 samplesTotal

4760N 4680E - 5320E4880N 4680E - 5320E5000N 4680E - 5320E5l20N 46802 - 5320E5240N 4680E - 5320E5360N 4680E - 5420Ebase and tie lines

Proposed new grids to be established

III

south Bischoff Grid 4760N5000N5240N

1074 Cut Lines

II

Grand Total:

Total

SOil Samples

413735

ll3

,amples

"..,ample,

800m120m68011I

220011I

26480

IIIIII

lIPpendix I (cont)

Detail, of Proposed Work - Ramsay Area 1980 (cont)

Survey map and pan concentrate sample:

The Ramsay River and major tributaries south of Osmond Creek

Creeks draining the tin zones north of CAE

The Ramsay Kiver and tributaries draining the Granits/Crimson creek contact zone

Total: heavy concentrate samples li

Magnetometer SUrveys

All grid lines

Home Track

096040

8000m

3500m

6500m

18000m

20960m

1000m

II

II

Crone EM survey.All grid lines

G!ologicalMappinq

All cut lines

Access track.

Creeks

Total

Total

Total

21960m

20960m

26480m

9000m

18000m

53480m

I

,~~~

IIIII•

IIIII..

APPENDIX 2

ROCK ANALYSES

096041

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(4) Remarks:

Number of Copies: 3 .

Order No Date Receiv«:t...•~~.~.~~.I~ .Reference......•.~t.~~ Resulb Required .

Delivered by Total No. of Samples..•.•..~'l. .

ANALVSIS - PREPARATION A.ttA\.'I'SI$ - MEn·tOO

PefChlcric ....Id ., cold ....id C• _ic~n >J£

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52 Murra\, Road. Welshpoo1. W.A. 6106 Phone 109) 458 7999 Rc '- t< Cf-f' P.s .44 Lane Street. Kalgoorlie. W.A. 6430 Phone (0901 21 1416

ANALABS CAU8T.JANALYTICAL REPORT

Authoriud ff~ I'I.J........ 'Offlcer ~.••••.•-; .

15) STATE OF SAMPLES

wfU)leeo•• WC

",I<t_. '"....,.. cu

~. .0.... so~Ip 'U_.

w.<.~ TO

(3) Number of pages of results: 6 , .Date Reportod' /f.. ~ 7.5.. .R lts to: 11)•...••.•..•••.•.as..aIx::Ne.,................................................ (2) ••.•••••.•••, .

Thk "port ml»t be read In conjunction with the result. given for JOB No. ...~~J QJ:. ~~.~.~ .

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STATE OF SAMPI-ES

IPR.ETREATMENT ANAL.VSIS

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Phon. (091 458 7999Phone (0901 211416Phone iOn) 43 6837

TUlI! IAMPLIN~ No. ..z;::.

8EOCHEMIOAL RESULT SHEET

M."...Atpe8t-

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~~P~t.w.'ll&e44 Lane Street, Kalgoorlie. W.A. 843015 Traders WIY Mt. 1sa. ald~ 4825

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0«1., No. J 'II J±

Phone (09l 468 7_Phone (090) 211416Phone (077) 43 6837

Method

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IEGOHE.ICAl RESULT SHEET

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"'1tResUlts in ppm unless otherwi5e specifiedT .. element present; but concentration too low to m....feX .. efement concentration if below detection limit- - element not determined

fJrP.M ~-~RESPONSIlLE OFFICER..... ·······7.....·.. ·····..··· - - c:::..

-•.....•......--.-~ ..I ..•......2. .1.•••• _?i... .

ANALAEIS IAU.T.I52 Murray Road, Welshpool, W.A. 6106 Phone (09)458 7999

44 Lane Street. Kalgoorlie. W.A. 6430 Phone 1090) 21 1416

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096052

Code No.6!...'-!~ 'l "'6~'+Page No. ------'-__

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Phone tOO) 458 7999

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----+-----t--- -+-------1-----1------1---1

XRF RESULT SHEETSAMPLE I 5",No. .,

ANALASS IAU.".'52 Murray Road. Welshpool. W.A. 6106

44 Lane Street. Kalgoorlie. W.A. 6430

'5

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APPENDIX 3

PETROLOGICAL REPORTS

09G05Z

28th June. 1979

Central Mineralogical Services

r..:,

I~

IIIIIIIl

IIII

Hr. G. PIgottSenIor GeologIst

. c:oa.taff Pty. Ltd.c/o Post Of'lcaWARAfAH I fAS. 7]21

231 Magill fto_dMe,'.nds. SA. 5089T••ephon. 425851

.'O"T eMS 79/6/17

YOUR REFERENCE: Letter deted 5.6.',,,"/31

DATE RECEIVED: 8th J_. "79

SNl'l£ NOS.: T 785 I - T 7871

SUBHITTED &V: G. PIgott

WORK R£QUESTED: Petl"OlO9Y

H.V. Fan~r, H. Se.

IIIII

IIIIII-

096055

REPORT eMS 79/6/J7

T 7851 to T 7871

The twilnty-one rocks _ examined In thin-section .nd hand-speclll!lln; fivepolished sections we... p ~...d, ~d other optical tests _ ....150 carried out.The rocks· ue brleflv described In the .ccompuVlng ubi illS • Further c;.onments ....given below.

'-nts

The Il...at maJorltv of the rocks ue .ffected by vuylng deg....s of metasOI1IIItlslll,II'ld a n"er are no longer ...cognlsable because of the thoroughness of alternlonAs • generilll rulill, the more "reKtlve" • rock In • Illwn met.sOl1llltlcenvironment, the more .Itered and the less reeognlsil!lbl. (e.g. cantr.st the....ctlon of cherts and II_stones).

The ob.ldlu-lllee wlc~lcs .re unusual ~d have not hlth.rto be.n seen by thisauthor from th.t region; the "g...ywaclces" ud other sediments U. IIDr. f ...lll.rfr- the Cambrl.n.

Apart f~ the dIffIculty of correctly InterpretIng the orIginal rocle from the_ta_thed .....ss.. now rep.....ntlng It, the _jor problelll Is thillt of thepre.ence or Ibsenee of cu.ltarlta.

There Is Ifttle doubt that sphene hu fonned In IlIII'lV of the rocks; unfortllll.taly,MIen thIs ",Ineral Is flna-llrilllned, poorly-defined illnd c.loudy, It Is very e.. llvconfused with fine, granul.r c.sslterlte. Considerable p.1llns were tillleen todete...lna, by vulous optlc.' tests, that the Illner.1 WillS In fact sphene. butthe results were not .Iways unequlllOCal; hence, It fslt"rongly advluble thetcheck illSS-VS for Sn be e-rrlad out (a.g. on saq)l.s T 7858. 62, 63, 67 and..me,. other.). Ap.1lrt froll Its confusIon with cassiterIte, the... Is so­avldence th.t sphene cillrrles Sn In Its structure, perheps fOrlllnll .. contInuous.arles with IIlII.vlta.

5....,. T 785-' Is _gnetlc, putly bec.use of detrlt..1 (fre...nd composite)_gnetlt., p.1lrtly "e-us. of Introduced, _t.'OI1IIItic _gnetlte.

H.W. '~der. N. Sc.

- - - - - - - - - - -.' .

CEN'I1W. MINEI\AlOCICAL SlI\V1Cl5 nY. LT'D.

Sarl'Ol. Rack Type - e-.ltl.... F.brlc "Inor "' ...r.'s e-"t.

Doulls

T 785' G...he". """'dr.1 p.tc.... at " ...rtz. _ .....te. E~n·gr.Jn.d. gr.n'tlc 5econd.ry rut II. (f... G...I....I..d ,r... lt. 0 .... '.ted rock. but

"' ..~ S'S~o of hyd........c:ovlte pse..-,."h'''' reld.p.n. febr'c. "'nor ......,,,,. blotl te) ...r ..... • ...ct _It,.... ..--. beee....

(T.S. 2785~) _ ...r hyd_covlt••ft.r Tblot lt• flak... 'r.ct..rlng. quertz ....1"•• feld.pen tot.lly replaced. F••tu... I••••.

T 7852 llet.......t:." 'Fa"ou. Rock. ~••..-rphou.!le11 ct _... I_us Prl ...ry • ..,r,y .petlte '.r....._.I .....I...r.1I ...pI_d by

~~) ~('cIa • 99Ng.te. 0' botlte after fhnrnbtencle;CNrM, 'eb.lc of ... '''t....1.... co".pl cous. !le"ct Ilblo_'tlc blotlt•• l"fer...d ~.ltlonext.n.I ... ly .Ite...d Tollqocl•••• -- .p...... rock. Ir.lde op8?.... 'of prlmery rock was dlo.ltlc. perhap.

-.-flno1Itl ptCGhe••

T 7853 • OlIvIne B•••lt (T.rtl.~ ....h ol'vlne pheno- Typlc.1 b•••ltlc lie... quartz ..noll til. F....h..... 0' ollvl .... COlIPI.t. ab....ce

~ .., \,\.::u:. cry.u (smali) In gmun .. CI' ...11 , ...h ,.brlc:no 'low-b."dl"g. wi th COIlIPlex ...ct!on- 0' devltrHlcetl.... of " .....",,..tl.br.dorlte I.th. I"ter.tltl.l brawn ,I••• no ve.let••• rl ... I~r.~l good cor....l.tl.... wIth:..:~' ;;~- • .;';;i~

r 785~ MetasomeUsed tlGreywackeu • 5u.,,....unded gr.'ns WI II-sorted/.1 ad. Phlogoplte-ectlnollt.· StrIctly • ~'c:anoMlct ••"d.tone.

,~l\.~i. ...~ of NWOi'k.d ...dOi.,te/b•••lt. , •••""",_.1 ... clastic textu.... p...- epldot.....1"•• Fehlte _ ..d of ...-wort<.d en•• ltlc to

..1.....10. 'eld.p.r. quartz: ~II,~I... fI ... •....d. WI.kly bedded. and che.t gr.'",. b••altlc III ...rals + rock•• pe..... I..ly;~ __;i, .it~ --ll~

T 7855 lletasomatl ••d TVole:enlc. N_"'''' round/o...ld !lettct Tperlltlc cr.cks Patche' 0' _rMr ActinolIte patcheJ could be ..pl.cl",

• ~l\,Ctllk 'Is \..~ .h.".I". patChes of lib",... ntl nollt•••t I" otheN'.' ....Id of actlnollt. '"t.rg.- phenocryst. (Tfeldsper) 9r .pherullte••' ••t ..... le.. cryptoc:ry.tll1 ht' ~11l2 - ?K-'.Id- texture., .tructu~•• with p..hnl teo I~:":-Y be _lcl.·'"II"",:oll&&lI", rock.

I •••• __• ICU",

T 785£ C.rbonaceous. "Iclceous S...d.,.~· FIne ••nd- UnIform. ...11~lOrt.dl Det.1 t.l ....vy ..I...rll. """-I"dur.t.d. b..t not _u,..rpIIosed.

s"~f '5\~e.to s' ft-\\tzeq-tNlrt% gr"n., "'"".,t:tJvl te flakes, .Ized. '.Intly bedded: - toumellne. _thl teo Verg'"g on .lIt.tone"'" , ••lnsla and.rglll1se" Tf.ld.par: ... 11 c....",." with qua.to miu flake. IIlt,;.d._ leuco.,.. zl rcon. on S!:!!<!!! I" _shlon.

I~;_•. ,,;;;;' ...

T 7857 lIe_tl..d TOb.ldl .... Cry,·"",ry·t.lIl ... V.ry ... l1-p.........d Le"......" ..I", 0' Int.'O...t.tlon b•••d .I_t ."tI ...ly on

klb~.'W:6E siliceous rock. wIth ..ltr,"ne ,flOP,I •• ...lIct , ..... '!!!'!'PI." ...ra caenely crystal- rallct t.xt...... COr..lltebl. wIth- oo••lbly.:t"', c.~~.11~~=~::: throughout.

~Iow-b...dlng. I I... <!!.opslde. FI ... T 7855. SulphIdes· lJUrhotlte. \lY.,t••1••_' .....t..;.....~i._ ..

T 7858 lIe_thed C"'rt. IIlcro/c,'yt·It,cry.t.lllne SUlplclon 0' pyro- Ultr.fl... leucoxenel RIght cont."t For ees.lterlte. b..t

~ 1.,111>;' I'>Q~5i? .lilce. IIlIp..gnated with f1netr.Vlte: .ub- clastIc textu... I" rutll•• K-feldop.r ldentl fleetlon not certll". becaus.p_ranel zona of e:a-rser dr." 'Ill .•..!!!phldes, pl..... ~I~t bedding. fomed ..."t to __r

crystals ~~I;':ry":~I..!:,~~ .) ....d.T;:;::-': ••~it.~It.:- '_._ded. S..lphl., • Il)'rltl..d "!rrhotlt.:

..

-------------CENTRAL MINEIW.OCICAl. SERVICES 'TV, LTD,

S_II IIack TYI'Il • Compo., tlon Flbrlc MInor Mlner.1I too-nt•... ·.111

T 1~5' Motl....tl ••d 'Ob.ldla-. Mlcrocry.t.III... WIlIl-p...."""d ..II ct Flna ?phena occurs •• Clo•• ly .1.II.r to T 7857. Pot••h .t.lnQI.. 1I~"/so ';.. davltrlfl.a gl •••y #O,.lc ..t.rl.l ••xt.n.lvely Flgoo,:lIandlng. Foldeel. • trln,.r. throQghout. t •• t _Itlve. IndicatIng. K-.lllcat•

repl.ced by ell_Ide. t ..MOllt•• pl.glocl.... DovltrlFlc.tlon l~fPYr~f" eYrrhotlt gl••• ph•••• 'yroeat••omatl••d. Sn ••••.v .ulahlde.. o' '. • teJICtuNs .. rlth.d • .dvl.... I••

T 7860 Mot••omotl ..d 'Ob.ldl.n. VI rtu.1 1'1 compl.tely A _ ..ntt p.tche. V.ln. 0' FIbrOus. 1'.1. V.ry thorough py.......t ••omathm has(i'\I. k...~NI "QllOf

repl.cea. but ./crogra-ul.r dlop.lde. IlItche. with fJ_bandlng, but' .ctlnollt•• 5ulphlda. vIrtually obllt.r.t.d orIgInal rock,o',:iMOlIt.'actlnollte. FIne lI..nltl .nd _tly ve~ Flna- ... exrrhotlt. only. .XCIpt for • =9~\Ict p.tche•.11.' Ide•• 'erllned. .......lIno T •

T 7861 MotasOlllltl..d 5.dl..nt. ,rob... ly vol_Ict ClastIc texture. FI.. cloudy llueo_- Or'glna' ~ was • clastIc sediMent,

(f\o.. k~.1 SI7\le"Itltone; compos.a 0' ....11 pl."locl... 9r.I•• recognh.b1.. but .phena throughout. _.Ibly ..__rkad volcanIc. or po.. lbl'other .It.red mln.r::~, .xt.n.lvely ..placed I.rgely obllter.t.d. ~%r'tl"d pyrrhotIte • correl.tabl. "Ith T 7856.b., t ..MOllt. tou.... Ina .uIDhl••• Idi. lcoovrl t••

T 7862 Mot._tlc Ilock. Cotoposad Intl ..ly 0' Flna "Icl'01lranul.r and Iln!.""! cry.t.I-clust... Mlcragranul.r .phene ..ry difFIcult to

(f\L 5Nt.<ln ( '>Iose ..t._tlc 1'.1••ctlAOllt•• chlorlt., Flna ...tt.d Int.rgrowth.; on .urF.ce.. Al t.red positively dlstlngul.h from c••• lterlte.ulphlde., c.rbonate' and .bund"'t ultr.flna no ..11 ct Fe.ture•• pyrrhotl t •• pyrlt•• 5n ••••'1 •••entl.I. Orlgln.1 rock.Jlhi,... ~.

T 7863 Mot.......tl<, Ilock. Matt.d .nd gr.nul.r '99"- F.lnt I..,.rlnglbandlng 'rrhotlta as s...11 'P.....nt 8 •••"'ege SIIqg;est orfqfnat rocl

(\>,\. k"'_I~1lt!g.t•• 0' ellOP".' preholta••ltl..d F.,d.par. and 1cl.stlc teJICtu,.., c vot.r' throughout. uy. have bee., senr'-ca'careQUi. but

./g,ranul.r .phe.... F1 ... sul,lIldas, .'derlte. ".rely racognl.abl•• p.rtly oxldl••d. ra11 ct faatur•• ob II t.rat.d.

T 7'16. Ollvlna I ...lt. S..11 .c.tte..d phenocrysts HoMOqenaous f"'rlc S...II ,",g...tlt. Typlc.I fra.h T.rtl.ry b•••lt. Yery~... ~bClO of 'rash ollvlna In • unl1o... ground..... of "Ith r.n_ cry.tals. OCcasIon.' .I"".r to T 7853 In .11 det.II •• 'tuencl

• nde.l ... ,.th•• granul.r .uglt•• lnt.rstltl.I orientation. _<JdeI.s "lth texture. In 91••••b.-. ql.... carbon.t•• chlorlt••

T 7865 Pyrltl••d ~'...r.t•• Large and ''''''.tl!\lI1de~ Rounding of grll.. In- Quartz w'ns cut Featurel••• ollgo.lctl~ congIOlOOr.t••

9- 10\0'0 9r.l"s. "..s 0' p-1rltlc quartzlte,Qrbon- dlc.t•• congl...r.ta. ..taquartzlte pebbl••• perv"'Yely pyrltl••d, but ~t_rpho,__ ..t ••lltstona, quartz IIItrlx anel Int.r- llellct cl••tlc textures.tltl.1 I!Yrlta/lMrc••It.. .

T 7866 C.rbon.caous, ~rltIC 5and._. Flna quartz, SoMa 1.I~_• truc:tura., ~rltJ cryst.l. In rack Orlgln.1 ~_ous, p,vltl,c, f.'d-

\l- 778lJ ,.'dipar t..rlC tlaea) •••U6an"ul.. gr"ns. .uperlmpos.d fr'Cturlng pyrltl••eI I!Yrrhotlte .p.thl~ ••nd.to~/.tlt.tone"as .'umpedgradIng Into ..Icacaou••"tstone; carbon ,,,.. , Yelnlng. ~••" • nd 'Ine elr.vlt. In I.t.r fr.cturad...I...d .ft.r Iithlflc•• t ....ks. beddIng• quartz verns. . tlon

/

/

./

oU'I. }

. «"I~~ . 096058

P.O. SOX 91, NORWOODSOUTH AUSTRALIA 5067

16 KENSINGTON ROAD, ROSE PARKSOUTH AUSTRALIA

~!Ifj[AALCGIGAL n:F-CRT riC. 2628\~:

'""', ", .'\ ",~ ..- ,

TEL. 332 6744A.H. 31 3816

•

" ..'." .......:' ..." ......

,---..'-

•

IIIII

Mr. G.~. Kru~~ei.

freUfiSS;j AurtrcHE ptV. ct.e ••FarrEr House. 4th floor24-26 Colline ~treEt.

K£L5CUNN£. V1ctor1c 3000

Ghi'./el1 letter 25/5/75

fioek semplEs

III

Iv" t.T1nCATlc.r,:

S~lES & SlCTl~S;

Rr./"', 1 to 7

Fetrogrephic er~ minErgGr~pn1c

examinetion with dete11ECcomments BS specified

neturned to you witl1 tl1iereport

FmJTIFEX & ASSLCI~TES

I .\;)":J'b.

,

IIIIIIIIII

IIII

. .096059

CGMI'oENTS

All eemples were examined in thin end polished sectiones reQueeted. TheV are all more or less hornfelsic in htndspecimen, end indeed they do represent contact-metB'l1orph~:.-d

'sediments', which hes to e fairly lerge extent resulted in egenerally simileI' metemorphic assemblege throughout but with ml~~r

differences in minerels, and/or texturea which indieete oifferEntoriginal facies. These may be grouped a8 folIous -

(1) Samplea RAM 1. ) and 4

'Hornfels' composed of slbite and/or cordierlteJ intimatelymixed with e generelly essential abundance of secondary biotite

-~

and tremolite with an anomalous abundance of disaeminated ilmenite•

(10%). Minor fin8 sand grains are scattered.

A,vague relict detrital texture (including lithic frcgwents)is preaerved.

The collective evidence (also considering the ~etb­

sediment RAM-2), indicatea this group to be a rather i~~eture Ii_hie-detrital feeies (7 wacke), derived mainly from en snGeeitlc-baeeltI· _

terrain (7 tuff or lava), with a separate minor qusrtzose contribution.

Minor disaeminated pyrrhotite, generally altered aod plu~

trace chalcopyrite are esaentially indigneous.

Apart from contact (tempereture) meternorphJ!! the cordieriteand b10tite may 1n part be due reapectively to minarMg and tma5aaomat~. l1kewise pyrrhotite may be in part slso Que tcenrichment in S.,

L~~

IIIIIII

096060

-2-

A relatively mare homogeneous fine grainad, hornfE15i~

spotted elate; comp06Ed of cordierite end biotite, plu._._~. - *

ubiQuitoull fine ilmenite, end minor chert inte!'~EdE;. Co:rct5v~h~--.... -~ .

this may be a metamorphosed pelitic dolomite, hOhrfVEr t';"---,.--_ ... '*-enomalous dissemineted fine ilmenite end miner iron Eulphidrrindicate 8 genetic relationship with group (1), p.n~ it ~~y br

considered ea B fina silt~~pel1tl~quivele~~of thet fcci.~.

(3) Sample. HAM-5

IIII,

IL-",

This rack hBS the 8eme grass composition a6 group (1)above, end must surely haVE Eseentlally the samE ~en£51s, £v~n

thou;h lt 11l texturally different. It canslste of fine biutl~f

and emp:;1~01e (actinol1t.E) mare cr less segregated into bares,bath within e 'matrix' of extremely fine, diffueE microcrYEtalli~E

.albite. Fine llmenlte is disperaed throughout, minor alterEd-". -...... .pyrrhotite + trEce chelcopyrite, and rere gtlen£ ere elEo ~reeen~.--. .-~~- - ---.. - ....

(4) Semple$ RAM 6/1, 6/2 and ?

The cammon characteristic 1n these three samples is

essentlal extremely fine calc-silic~!~i (\£!!o11~! 1n 6/'

and 6/2. and d!.2P,,~d~ + t!!",ol~~e in 7). Also !!E..he~ 18diaseminated. but there 1a no ilmenite.

Semple 6/1 1s brecciated 1 tectonically which heEfac1litated mineralisation by pxrrhot~t!(essentlally ine1genuwEbut reconstituted), Blao by tourmaline which 1s elmost certainly. _.. _-. .....epigenetic.

Semple 6i2 has a heterogeneous. relict eedlmEntery breccl~.' .....

texture in which evrrhoU~ hIlS the Beme IIIOde of occurrence 8e in6/1.

IIIIIIIII....

096061

Semple 7 Is s messive, t~r~£~m~o_li~~!~peldF rock,wIth scattered euthlgenlc pyrrhotIte grelns end rere_.. .-ereen~~rlt,. The In-sItu mods of occurrencr of thee~

Indicetes thet they sre predomInsntly IndlgenDUs, slthoughss In group (1), some enrIchment In S mBY heve occurred cUTj,~

metemorphism.

c~ This group is Interpreted ee probeble met~rnorph9~~~

~omltlc-tecle;, slbelt wIth mInor fIne clestlc Impurltle~,

moet ebundant In 6/2.

There Is no evIdence throu;hout the suite, of tinminersllsstlon, however if enomalous' tin values ere re:crde~

chemlcslly, It 18 BUQQested thet the tltanlferous ph£3ES(noteeblv the sphene In group (4) rocks ehaula be checkcofor pOBsibls Sn.

--

,,;

(.

quartz forms an estimated 10% of the reCK. as dleserr.inatccsingle sUbangular to subraunded crystals. avere;e size 0.2 mm.These may be clestic send or ;:!ossiblv tuffaceous: I:inor P£:;C.'1Es

and discontinuous veine of ?hydrothermel quartz micromoEeic cccu;sporadically tnroughout.

A homogeneous. messive. very fine grained hornrc15ic-lcc~:nC

,rock. The bulk of it conr,ists of e 'mstrix' of eSEentlcl ciff~SE.

"Jf'PSt::::1Y. ~nhedrcl. probable cordieri ta (but possible untc'inn(;;j l.',ltn to:.) •~. ---crowded with ebundant clusters snd randomly IntErlockin~ ffiir.utc ~rleDe

of tremolitF. eleo minor. acattered fine (secondary) bro~n bic~

(1u~). (The Optical propertiee or untwinned albite end cordiL~~"

in this form are virtually identical.)

. x,>-J'\) .IIIIIIIIII•

1\;'1, - 1 .•

096062

(elbitF or cordlerlte)-- _._---- _._- - .-biotite tremolite 'hornfele';-" . -... .. _.. , ~

minor scattered Quert% diEEE~lnFtf~ ~lm5nlte;_.-..-........contect metEmorphoEEd tuffaCEous ir,t~~~5~letE

volcenic fecies. or a B~e_d;:..;i:.:;m;,;;e:.:.;n;.::t_d:::.E:=-r~j~!;,': frc,:,bee8It1c-~~es1te 4: GUllrh et!ntanln"tio~

kinar amell patchesalteration selvages along

af chlorite sre also-cnlorite stringerlO••present. 6011e. es

Minute opaques (101). average aize of O.O~ mm. ere wwicuit~w~.

variably aa individuals and lacslly in irregular clumpL. In poliEns:aectlon these ere identified aa minute lathe ana anhedral grein= of1lmenite. acceaeory p.yrlte. tra~ p'vrrhotite. Tnere le r~ ms£r.etite.

Th1a 1a a medium gred! (albite-amphibolite facies) cRnt~~

metamorphic rock. Ite gross composition Indicates an ariglnalintermediate probably transltiDnsl to beelc. tuffaceous volcanlc;alternatively 1t;may be intefPreted as a volcaniclastic (deriVEd)sediment...aio1" from basaltic-andesite saurce. contaminated withquartz tram another source.

. q..'I~"

IIIIIII

•-IIIIIII•

09G063

rellct banded, epottcd, Cictit,~cc~~lerite,-hornfels or hornfdeEt' _dett~ ldU,

ebundent flne Ilmenite (~lncr £ltEr~c-",-_..-pyrrhotlte ere: chelccP~'rit! ~ eCI tt!re::lalong the levering; miner irtc~crJ~ted chert_ .. -- ....

Thls 1& e leyerfd rock, generdlv flr:ef p'r i !",c:' t n:. spotted,lndic:eting morE r.dvenced h:'rnfelelng then in ",:,:,_". -;1',1:;; eppeers'f-to reflect original sedimentst" bedding, lr.cl"ciing ir;t-r"LJI"'iotlonel

slumping.

Aggre;etee of loose-pecked attenuateo lens£5 erE ~Iabably

intreclaste of mud flake ~YP!; i.e. ellcc:hE~lc£l c:o~pc:o~nts·trans­

parted end/or t!1fferentieted within e cerbci.Ete fECiE'-

hast bends consist of spattej, cr fine rncttiE~ ~C"~ a' ~vaid.

Incipient cardieritc porphyrcblsste. Lxtr~"~l~ fin~ ,~~c:ondary)

blot1\e ; minor chlorite 1£ IJbiquitous In ert:Ef, :;i:t",H: :::::SE: ollOldG.end dispereed in lesser cancentretien St ilicl..t::'=.-s L.;'- _; toem.The concentretion at' biotite vEiriee t'ralll 251. ir. ::C.:'.~· "',,:,:; .. te ~1n athere.

Minar thin chert band, ere Intercaletec. ~bunoEn. extremely'lne (0.001 to 0.05 mm) opaquee ere ecattarat ~lcn~ trot :~~erlnw 1nverleble cancentratian. but commonly formin~ up 'l.C 1(.;. c:- E g1venbend. These sre 1dentit'led In polished BEctlan ee ma~nlv ilmenite.-varlebly as lath-form crystels, skeletal end emOGboiCL: in farm•

• ••1

RAM - 2 continued :

The sulphidee ere indigenous. The amount of ilmenite iEanomalously high and almost certainly indicetes s reletionshipwith RAM - 1, BS en indigneouB 7 tuffaceous impurity, or espelitic detritus derived from an intermediate to bssic sourCE.

This rock may be interpreted as en orlginsl megnesia-rich

pelite, I.e. a ~o}a~~t!c~e~~~e, eF composed of extremely f~~

detritus derived from a bafill~lg~!ItIILPJ;'oveJ\enc~. It hes beEncontact metamorphosed, but without destruction of primarysedimentary structures.

Anhedrel grelns of pyrrhotlt~, largely el!!!ed ~~

secondary, melnlcovlte pyrite-merca!~e, ere scatterEd elonQeome layers end rarely occur In stringers. Thie ie gFMercll\­slightly coerser than the llmenltei It forme sbout ~ of tM~ Tock.-Trece chalcopyrite accompanies same grains.,

IIIIIIIIIIII-

I

, -;

Thie rock ie very slml1er to RM~-1 except that It contelnsreletively more biotite and lees ~mphlbole.

A component not seen 1n RAM-1 however consista of small patchesof diffuse mlcrocrystalline ~uertz; theee sppear to be fragmentaof chert or volcanic exhalative materls1••

Beeically it consists of e heterogeneous mess of diffuse flnecrystalline unt~~nned Blbi1f end/or c~dlerita. intimately mixed with.'eSELntls1 emounts of extrEmely flne secondary ~otitc, needles endsmell aggregates of tremolite. 5in;le crystal quartz grains (1~),

everage size 0.15 mm, varisbly Bubengular to subroundedand somesplinters are randomly scattered 8S in RAM-1. Accessory relict,ill defined, detrital felspar grains (~) are also present.

096065

massive (albite or cordlerite), tremolits---- --,.- '.. - .blotite 'hornfEls'; w1th scattered fine_.~.. _. - -_.' '-

Quartz grelns, pyrrhotite and ilmenite;(seme fecies as RAM-1 end 4)

RA~l - :5 :

. (" tc-,..I·~'() .

I . .

IIIIIIIII1ll

Rather larger fragments 10 mm are vaguely outlined, since theydiffer from the bulk of the rock, only in their relative psucity ofsCattered quartz grains. Nonethelesa they do 1nd1cate an origlnal-fragmental Dr lithic sediment.

Itery fine opaques, generally <0.1 mm, and cammonly 1 to 10microns, are dispersed throughout almost certainly as an esaentiallyindigenous component. In polished section these are Identifiedmainly as irregularly enhedral grains of eyrthAUt, (711. RarelypyrrhctUo 18 aggregated and local1sed into discontinuous, .hortmetamorphic veins + trace chalcopyrite (and with lnt,rgrown tremolite).

GEnerally;f1n,r 11menit, (5 - '11) is alec acattered throughout,vari.bly aa minute lathe, anhedral and .keletal greins.

This rock repre6enta ,.sentially tne .... f8Cl.s 8S RAr.-1. end4, se, comments at the beginning of report.

· /':JI·~~

IIIII1t

II

096066

massiVE (albite and/or card1eritL).. ",'~" ,.....biot1te tremol1te 'nornfele';_. -4. __ • _ ..

m1nor scattered Quartz fine ilmeniteacceseory pyrrhot1te =trece ch~lco~yrite;

(aeme fecies 8S RAM-1 ena 3 )

The bulk of this rock conslsts Qf a ver~ flne difru~c

micrccrystBlline moselc of albite arel/or cordier1te. !ntil'lr"tEly-- _. -~_._~-

mlxed wlth an essential amount of e~ually flne blct1tE ~r~-...-'...........-...

'\ t!empJgl'

Small (0.15 mm) relatively diecrete greinG ofe1nglccryetal quartz {1Q~)t and of quartz mlcromassic (~). ercscattered, eleo mlnor. rellct slngle detrital grall'S of RlEylacles~

(3 - 5~) are presEnt. Minor fregmenta of essentially the scrr,ecomposition as the bulk of the rock are vaguely preserve~.

very flne (generdly <0.5 mm) opeque grains Bre ecetter£dwith a vague layered distributlon. In re:lectec l1gnt thcEeare identified me1nly as ilmenite (7 - 10%). but 1ll1th n.inor.

al1ghtly coareer anhedral graina of Qyrrhoti\e (2 - 3~). rcrely

accompanled by trace c~opy!~~e. ~aret very amell. ~~tcmQrphir

.egregetlon~type velna ot pyrrhotite + trace Ch~~S~~~~ ereprEsent.

Thie is a h~~~~. b~~~3 on a acale of about 2C hom,

browniah bends in hand apeclmen ere rich ln fine biotitE;. . . . ---the dark grey bands contsln easential very fine emphibolr----, ;'~

instead of biotite.

IIIIIII~

. .

R~M-5 :

0960 G'7

falrly broed banded 8ctin~11t~!

b~lt~. ejpit~ hE:nfelsie~tremely flne l~it~. p~rrhotlt~

dispersed; lesser cosrser ~~rhctlt€­

+ trace c~opyrlt~ end rarer ~lEna~

ln ectinolitic vein-like seoreoation:----- - ----- - .

II

petrographically the biotite-ric~ bands ere elso seen tocarry minor fine actino~~t~ (1~). and extremely fine opaCUES(7 - 10~), ldentified in poliahed section 8S mainly ~~nlt~,

aubcrdlnate PJt!r~~~~. These components are fairly evenlyscattered aa diffuse microcrystalline moaaic of generallyuntwinned albite..... .

The emphibol1t1c banda cons1at essentially of' s hcrnfe:lr.icaggregate of extremely fine actinollte lntimately int~rgrcwn

with alblte. and with disseminated fine opaquas (7 - 10%).The opaques ereneinlv ilmenite. but minor pyrrhotite 1s elsopresent.

Localised irregularities and dislocations in the planerlleyering are elmast certainly relict bedding character1et1cs,but they do act as a locus for lenticuler end v.!~-l1~

ae9reg~tio~s of falrly coarse actinolite + pvrrna\ite Bnctrace very flne e.eidote.... loll th lIinor braided stringers ofcryptocryatalline quartz. Minor chalcopyrite accompanies Bomeof thie exrrhotlte. trece i81ene i8 aleo present.

In hend specimen this rock ia vaguely bendE~. with cne ~cnc

dlspleyiflg quite intense breccht1on. Rarer f'recturu: ::lEOoccur elsewhere.

~' Petrcgrephicelly the bulk of the rock is seentc ccnsiEt ofe ccmpact meaa of very fine prismatic tremolite. with minor (10%j-interstitiel albite. end disseminated, ultrefine sehen~ (1~%).

lccelly the mesl is t4ne bandeq to laminated, end thEse structuresmav be disloceted end/Dr ptygmetlcelly fclded with relativelycoarser prismetic tremolite along movement interfacEs. Thistremallte cerries miner pyrrhotlte ~ trace chalcopyrite.

· \,;)1\.

I~

IIIIIII

1',,1·: 6/1 :

, -" I f-...... , -::. -,',- .

096068

massive f~_Q!~n~d (hornfelolc}tremol1.~e rock: llIinar intereUUal elE,it.f;lccelly fractured end dislocated erne~

pe1'lllsated by t:Jurmellne end pyrrhoU ts-"- ...(nolll altersd)

;-

Smell (0.1 mm) crystels of very psle brewn tourmcline cryetele,some with a psle bluish-green core sre irregularly scatterED t~r~~g~

the fractures and flesurEs in this l'ock, end locellv pun.ce1.clO t11S,

levering to form e totel of about ~ of 1t. ThESE ~rE e~e~ciatEc.

l&Ii th (but do nat conetltute}the opeque minerel BeEn in hEnd S~~c.;;."."r .•Tnet mlneral 1a identified In pollaned sEction as &Ec.ondarymelnicovlte eYl'lte-msrceait~, hav1ng formed by extEnsive 6upErQer.~

alteration frae pyrrhDtit,. Trace chalcopyri~E occurs with tnEE~

iron sulphides.

Thls pele brown tourmellne may be locslly confused w1th ~inor

pele brown (phlogop1tic) mlca.

Th1e rock 1a mare msgne.1c (tremalitlc) then esmples ebc~E, andI

lacks ths abundant i~enlte characteristic of them. It may beobjectively lnterpreted a. e metedolomite, fractured, end penetratedby tourmaline of (contact) ..tesemetic origin. .The pyrrhotite seemamost likely to be en 1Rjigenoua, l'econstltuted component.

\- J-,-, E?(f'\. .' ., .... !j ':;>JlA') •

096069

I,- This rock hes a combined leyared end brecciated structure,certainly lt is more 'fregmental' than any ather rock in the suit~.

6eslcelly it le a banded rock in whlch eech of tha pocrlydeflned bands conslsts of a tight pecked and roughly lsyeredaggragate of subangulef to subrounded fregments, between 0.1 end

5 rom 1n 81ze. Theee occur in a metrlx which hae essentiallythe seme composition.

~roughly layer~ end apparentlyinherently breccleted. extremEly flnc

_.---~.--

hornfelsic rock composed of biotite,~_...

tl!molite~ bends of detrital ple~lccle~,

minor ~~rt~frsgmente;

disseminated sRhen!, altered ~rhctlt~

i trece chelcopyrlte <1n pert e1~ile;....,.-~ --" -

to RAH 6/1)

"AM 6/2 :

- '::0I Co.~

I ••

IIIIIIIII@

These fragments end layera conslst of e patChy ~ggr~;etc ofintimetely intergrown pele brown biotite, sUbor~lnGte tr~~cll.~

and s1!ha~ in same bends; and flne appsrently detrital very f;.n~

~eRlocl8e~, ln a matrlx of ultraflne sphene end minor SC~".ErEd

tremallte in others. (xtremely fine altered pyrrhotite 1~

ublquitous, (eee below).

Hinar fregments of chert carrying accessory fine tremoli~~

and opaquea ere scattered.

SClme fracturea llnd/or pert1ngs. mare or lees between theleVers but alao cuttlng across them. cons1st of relatively coarser,clearer trSlllOl1.te croIIded wlth tine pyrrhotite '.6 1n RAM 6/1) •

•• ••1

, ~'

I~v .I ' .

,

IIIIIIIIIII-

I-

096070

RA~ 6/2 continued :

In reflected light the disseminated opaquee er~ idEntlfiEcse very smell (0.01 to 0.05 mm) grsins of pyrrhotite (5%)

completely altered to secondary melnico~lte-pyrite. This E~mf

iron sulphide 1s eCattered through the tremollte vEi~£ ~herl

it ie accompanied by trsce chelcopyrite.

.~. A trece Extremely fine (0.01 mm), 'opecus' tltE~jftrouc7

"'phe~e is enveloped in sphene. (If tin asseys l'!:re Enl'J~l"lnuE

for this semple, this phSSE should be checked ae D p~5~lble

tin-besring mineral.)

Thls rock Is interpreted as I!I ..etemorphcsedJIEd;"1~.ntar~

breccie, et least partly similar to the oriQln&l ~.t•.a\l~feCIE~--- ---<- ~~,-~

BS in RAM 6/1. However it does conteln definite bEndS ofdetrltsl felsic material (7 tuffI!lCeo~!); SISD metEmorp~15m heeinvolved blotitls6tlan, nat BeEn in RAM 6/1.

This rock consists ~s~en.ally of e very fin~ (0.5 rn~~"ff\...",'" , . .mesa of colourlees pyroxene opsidJ!), int1mf'tE'l~ j nt!:r!,Tc~'"

with a similar abundance of ultrsfine fibro~a , tr~~~J~tc (or•

possible nephrite) in petchp8 slso ebout 0.5 I"ll\ serOH. t,:!n;:!

extremely fine granuler sphene (10 - 1~) ie die5P~ln~trr., -. IrreQulerly enhedral oPscue grsins (7%<. sver6~~ roi;.r.

0.15 mm, are evenly. but randomly scattered throughout. r;;cr."i7.Clnl"

enveloped in carbonate.

09G071

~massiy.e, t~!!!i~!- diop~~ci_e_hornfels.;minor disseminated sphenE. pyrrhotit"------ ~-- .•end trece arsenopyrite_.. ~ .

R"M 7 :

'.••II

•••ThEse ope~ues consist virtuelly entirely of P¥rrr.o~~~~:

They ere unaltered, end their fcrm end ebunden~ silicate inclcsi~n"

within them Indicate en essentially authigenic origin. Locallythese ere aggregatEd into a cluster up to ) )( 5 mm. kccessory,distinct, eUhedrel sinwle crystals of efsEnoEvr~~ (0.2 x 0.5 mm)ere present. These ere elsa crowded wlth 6buncent In-s1t~

sillcate mineral gralns.

I The rock ia lnterpreted as en impure metecolomlte. OIl:' .1", l.r.~

sphene probebly derived from s tltenlferau8~eraillece~~

component. The 8ulphldes are e.aent~,~ly_lndigenou£~

, "y'

1:"\~' ..•

IIIIIII

TEL 3326744A.H. 31 3816

26 KENSINGTON ROAD, ROSE PARICSOUTH AUSTRALIA

MINERALOGICAL REPORT NO. 2641

09()072

P,O. BOX 91, NORWOODSOUTH AUSTRALIA S067

5th Jul y, 1'379

( \'<~~~..-.-- '''-

~PONTIFEX & ASSOCIATES PTV. LTD.

III

lQ.:

YOUR REFERENCE:

WORK REqUESTED:

SECTIONS:

Mr. G.K. Krummei,Preussag Australia Pty. Ltd.,Farrer House, 4th Floor24-28 Collins Street,MELBOURNE, Victoria 3000

GKK/ah letter dated 4/7/79

Follow-up comments onmetamorphic grade, andtemperature of samples RAM1 toRAM7 previously described inMineralogical Report 2628

Returned to you with this -.report

......

096073

Discussion

The previous report 2628 was reassessed, and the sectionsre-examined specifically to offer comments on conditicns ofmetamorphi~.particularlywith respect to temperature.

/

The common co-existence of albite, biotite and sub-aluminousrather acicular amphibole (tremolite, lesser actinolite) and theonly trace occurrence of chlorite, indicates metamorphicpressure/temperature conditions of essentially lower amphibolitefacies grade, but possibly gradational down into upper greenschist.

The critical minerals throughout the suite, relative to~

this assessment are the amphibole, biotite, albite, cordierite,and chlorite. Textures were less important since they are largelycontrolled by the sedimentary, tuffaceous (and local breccia)textures inherent to the pre-metamorphic facies.

samples RAM 1 to RAM 7Metamorphism,

IIIIIIIIII

This 'down-grade' transition is indicated by the generally

incipient, weakly developed crystalline form noteably of biotitethrough the suite; and of the rather 'diffuse-porphyroblastic'nature of the albite particularly in RAM 1, 3 and 4.

Also the biotite appears to be a very low Ti variety, and inthe presence of fairly abundant titaniferous phases (ilmenite,sphene), this indicates a low temperature form of that biotite.

Likewise the cordierite in RAM 2 o~curs as incipient, very

weakly formed crystals.

..,

The spotted· texture, manifest as the weakly porphyroblastichabit of albite (in RAM 1, 3, ~) and of cordierite (in RAM 2),considered together with the metamorphic mineral assaw.cIage, confi.~5

that the samples represent a (low grade) c~ntact-metamcrphosed

aureolje.

I ~.~ .

IIIIIIIIIIIIIIIIIII

096074

Conclusion

Essentially this entire suite of samples formed under

conditions of low amphibolite facies, possibly gradational down

to upper greenschist facies. This occurred within a temperature

range of 470 to 5000 C; and at low pressures, probably about

2 kilobars.

The minor variations in mineralogy through the suite reflects

variation in the bulk mineralogy of the original rock types.

Unf~rtunately there are no variation in metamorphic characteristics,

distinctive enough to indicate formation at relatively greater or

lesser temperatures within this generalised range of 470 to 5000 C.

Assuming that the entire suite represents a zone proximal

to the intrusive which induced this low-grade contact metamorphis~,

(7 or in 8 roof pendant), then that intrusive may be regarded 85

'high-level'.

• Note During the reassessment of these sections, the diopside

noted in the original description of RAM 7 occurs in only accessory

abundance, i.e. less than indicated in that description. The

main mafic phase in that rock is tremolite.

M1NERALCGICAL REPeRT NO. ?66?

096075

1'.0. BOX 91. NORWOODSOUTH AUSTRALIA 5067

1st AUgullt, 1979

Hr G.T. Pigott,Comsteff Pty. Ltd.,Mount 8illChoff Road,WARATAH. Tasmenie 73?1

79/37

Rock llamples (8)

T7872 to T7893 (not consecutive)

Petrogrsphic description,polished sections if n~cesssry

Returned to you at sbDvesddress, with this report

PONTIFEX & ASSOCIATES V. LTD.

26 KENSINGTON ROAD, ROSE I'ARKSOUTH AUSTRALIA

VGUR REF"ERENCE:

MATERIAL:

IIlORK RE quE 5TED :

IDENTIFICATION:

5AMFLES & SECTIONS:

1(:-

TEL 33267«A.H.313816

IIIIIIIIIIIIIIII

096076

The tourmaline Is pleochroic, variegated from palpbluish with minor, diffuse palp brownish pstches in somecrystals and aggregatea.

There are no other phases present, and presumsblythe rock represents ~assive, pervasive quartz-tourmalinFmineralisation, of epithermal or pneumatolytic origin,associated with a granitic intrusive.

This rock conalsta of a massive, aomewhat patchy,lnequigranular, allotriomorphic aggregate of qusrt; (about

with to~~i~~1 (50') scattered throughout, essentially asan irregular network of r~gged groups of subhedr~l to

, er.· edrel crystals.

massive fine to medium crystsllinequartz-tourmaline rock-- ----

T7872

';'fl\f- "~;I.OeI""0N

IIIIIIIIIII

I

Clouding by clays in plagioclase, is ~ro~ably ~ue

to weathering, and represents the o~ly alteration.

Accessory plates or dark brown biotite (5~) ere-''''._-.._-0

rsndomly scattered.

Trace zircon inclusions in biotite are the onlyacceaaory minerals.

This rock has sn ineouigrsnuler hypidiomorphlctexture, average grain size about 1 mm. It consists of e

mossic or randomly interlocking, subhedral to e~h[dral P.!!9~~cl~~e

~(:~.), generally coarser aubhedrsl to anhedral potash relseer:::. .' ,',. , . - ,~,~'." ,~., . -..

(35 - 40"), and anhedrel ouartz (.35"). The potesh relspar• __.~_-4 ~-_ .. _._. .. __

is highlighted by the yellow colour an the stained sectionorrcut. Some or the coarser crystals or ~-spar carry smallinclusions or plagioclase and tend to be perthitic, and somecarry incipiently ve~icular or greohic Quartz inclusions.

medium grai~ed albeit ineQuigranularleuco-adamellite; with accessory_____,._, , __................... A"

scattered biotite

T7873

C.l\f ~N\S'~oE:.

IIIIII

IIIIIIIIIIIII

<'\

I~ 096078

The rock i8 interpreted a8 an original dioritic intrusive,altered by a combination of retrograde (1thermal) metamorphism andhydrothermal biotitisetion.

Irregular patchy maases of fine biotite J2Q1) have a8poradic di8tribution; these may also replace 8 primary phase,

although ba8ically they appear to represent hydrothermal biotitisBtion,akin to incipient pota8h metasomatism.

About ~ of thia roc~ consists of e crystslline aggregate

of randomly interloc~ing ~9!~e~e crystala. These are poorlydefined due to diffuse, grerlationsl incipiently recrystsllisedintergrenular contacts, alao dUE to ubiqUitous very 'ine ~hloritE

...• _.--'. --and fine fibrous actinolite secondary alteration products, which--are intimately intergrown within the plagioclsse.

hornblpnde (1biotite) micra-diorite;recrystellised, emphibolitised sndbiotitised by (thermel) metemorphism en~

aesocieted potesh metesomatism

T7874

Ilbout 40" 0' the rock consists of patches of reletlvelyconcentrated very fine mafic material. 50me of these consist ofactinolite + minor chlorite, tremolite and rare biotite which_.._--~._- - . "-~- ~---'- -_... - '.pseudomorphicelly replecsa former primary hornblende crystals-_._--(1)Dl1') about the same size as the plsgioclase, and which formedan integral part of the primary eggregste.

IIIIIIIIIIIIIIIII

I· 'b.~I'.,. . 096079

Skeletel. enhedrel greine of ilmenite (5 - 11) ere scetteredand generally intricately intergrown with the iron sulphide graina.

A Bingle qUBrtz vein cerriee reletively COBre••elnicovite­pyrite replicae after pyrrhotite, with trace fine chelcopyrite

inclueione (which ere unaltered), eleo .inor fine tr..olite.

In oalishe~ aection th~se sre identified mainly a8 primarypyrrhatl~ graina (~of the rock), moat of which heve beencompletely pseudomorphlcelly repleced by seCOndary (melnicavite)pyrite. About one-third of the original pyrrhotite grains remain.

urelltlspd. leucocratic microdolerlte

(1 dyke); abundant scattered pyrrhotitelargely altered to secondary (melnicovlte)pyrite. end intergrown with il~enite;

~uertz vein cerries pyrltised pyrrhotiteZ trece fine chelcopyrlte

..T7875

Thie Is a homogeneous. massive microcrystslline rock.

It la composed euenUel1y of rendomly interlocking ;:J.l..~l~c:l!l.~:

lethe (2Q!i). end eubordinete more or leas interstiti!ll, relatively

re~.ed, uralitised mefic cr}!~~1! (~5 ~ ~!) of .1milar fine alze.Thl. essentl.1 composition and texture indicetes e leucocrsticmicrodolterite (dyke rock).

Rare, poorly defined feleoer phenocrysts are present.Minor velnleta and interetitial fillings of colourless amphibole(tremolite) + acceasory fine zeolite occur through the rock.-tine opeaue graina are disseminated, with a fairly consistent

aize of about 0.1 mm.

IIIIIIIIIIIIIIIIIII

... /

"tnar ftne magnettte ta etrung aut elong thle band.

In paltlhed lectton mtnar ~rrhatlte cOllpletely .ltered toaecondery (melntcovtte) pyrtte, and to ltmontte ls eeen to beaggregated wtth m!insttte.

Thle gradee lnto a band of extr..ely flne d19pel~! anglqrep~~oj~ wlth mtnar tnterettttel ~.r~ a~-'~l untwlnned e~bt~e:

whtch then gradea tnto a band of sOllelilhat coareer d!!!p~ eQQregstedwlth altered cordterlte, wtth ftne, patchy dsrk green hornblende mare01' lese tntersttttal and acattered cryetala of Iphene.

096080

thln-banded, complex"meflc, caic-alilcatehornfela; lncludlng altered cordlerlte, epldote,dlopslde hornblende, lnterstlt1al fluorlte,accealory Iphene, tourMallne, trace ?%eollte;mlnor pyrlte pyrrhot1te magnetlte:(contact­metamorphoaed lmpure arglilaceoul dolomlteand/or flne baalc tuff faclea).

.•T7878

Macroacoplcally e derk coloured hornfelslc rOck wlth e heavllyllmonlte-encrueted weathered aurface. In thln eectlon lt la aeento conalat of ~l_welldef~~.~,~~each about 10 .. thlck, oftlne, malnly c~~~=~!~lp~.~~~n~~al~~ formlng compact hornfelilcaggregat.a. The bande have falrly sharp, but none the leaa partlygradatlonal boundarlee.

The outermoet bend conalata predomlnantly Of green hornblend~

aggregate, lncorporetlng scattered enhedral gralna, and tralna offlne to coarae granular .agne~t!. Thla gradea lnto a Darrower marecomplex bend of fine dJopsld..!, sltered co_~.!,,!,"lt~, epl~ot!' Indlnteratltlel fluor~te; alao carrylng mlnar Icattered magnetlt~,

lesser I£hen, end trace t~~~ cryatall. Trace atrlngers of?zeollte are preeent •

._---

I\~.

I~

IIIIIIIIIIIIIIIIIII

IIIIIIIIIIIIIIIIIII

096081

17878 continued :

Mlnor much flner grllnl of ~~~~ho~!~e, rlrer pvrl~e.

Iccomplnled by flne Ikeletll, IlmOlt 'grlphlc' ~Ignetlt~

grllnl Ire wldeapreld through lome bInda, notelbly theextremely flne dlopllde Ind/or epldote llyer. Mlnutelnclullonl of chllcopyr~!! occur ln lome pyrrhotlte.

Thl1 11 I blnded c~pl~~_..!rlc~llp~lllcltehornfel!(sklrn), Ind 11 tenltlvely lnterpreted II I thermllly (contlct)- .-.etamorphoaed 'blllc' ledlment, concelvlbly In IrgllllCeoulchlorltlc dolomltlc Ind/or flne blllc tufr flclel. The mlnor._,...--.•._..:.----_._--- --_._- ..fluorlte Ind trIce tourmlllne luggelta I plrtly pneumltolytlcgeneale.

Thla la thl hlgheet grlde (thermllly) .etemorpholedrock ln the lulte, Ind WDuld 11eo Ippelr to be I more lnteneelymete-arpholed rock thIn represented ln the recent aulte fromPreueaeg, deecrlbed ln my report no. 2628 referred to ln yourcoverlng letter.

09G082

•

Valna .nd ...11 clu.ter. 0' actlnolltic hornblende are._-.._-~

.cattared, •• adv.nced ••nlreat.tlona 0' uralitic alteretlon.

Ultr.'ine Fe .nd/or Tl op.quea .r. ublqultoua (however Itla 'no~gnat1c' 1n th.t 1t do•• not produce a re.ponse to aawlnglng -.gnet.)

prob.ble micro-dolerite, (possible butle•• llkely • b•••lt); we.kly micro­porphyritic, pyroxene completely ur.liti.ed,pl.giocl••e we.kly ••u••uritl.ed .ndp.rtly chloriti.ed

T7891 :

Minor phenocry.ts 0' euhedrel p.!-~ocl••e (10 - _~5!')

.ver.ge .ize .bout 1.5 __ , .re .c.ttered through • rinercry.t.lline ground•••••

The groundm••e con.iete 0' ••ell, r.ndomly di.po.edP~~iiocl••e l.th., looeely .ggreg.ted with rel.tively .qu.t, equ.nt.nd completely ur.lltieed cryet.le 0' p'yroxe~, 0' eimll.r .bund.nce.nd eize. The plagiocleee lethe .re we.kly ••u••uriti.ed, MO.tpl.giocl••e phenocry.t. are .1.0 partly chlor1t1.ed.

Inter.tlcle. throughout this .ggregate .re 'illed by turbidInde'lnlte chlorltic end/or urelltlc elter.tlon product., apparently--_.... _.. _--.. -.-.• rter ••'lc gl••••

IIIIIIIIIIIIIIIIIII

. 'bCV

I.~ . 096083

•

Intergranular eree. are occupied bV turbid alterationend producte of ?chlarlte, chlaritic cl.V••nd .ome poasiblebiotite. The ubiquitau. di.tributian of thia meterial, ine.eentl.l abund.nce. give. ri•• to the derk colour of this rack.

T7892 IRa.slve. flne to medlum gr.lned.llthlc .nd .1c.ceoua qu.rt~ sandstone;

LPi} S\IlltoJ t~77c~ turbld 11..onitic-chloritic-cl.V sed imentarv.lteration products ubiquitous throughintergr.nular .rs••

A homogen.aus •••••iv•• fine gr.ined ssdiment.rv rack.indur.ted but nat m.tamarphic.llV crvst.lli.ed. It consiets of• tlght-p.cked .ggregat. of euba~uler d.trit.l grsina, ranging

-~. '.~'~_ .. -"-"'-' ..ln size fram .baut 0.1 to 0.5... The.e canaiet m.inlv of

.1ngle C~!~IiI.LqUIil.~t?:..Jlre.111'. .ubardinate I graina' of extremelVfine qu.rtz, .eri~it! Z clays, which .eem to be mainlV fragments

. of m.te.edim.nt, but pa.e1blv eome .et.-acid volcsnic erotaraltered feleper grain••

similarly orienteddetrital tourmaline

1e vaguely,Accessorv

Minar detrital mu.cavitealong an equellv vague bedding.end le••er zircon are .cettered.

•IIIIIIIIIIIIIIIIIII

,";)

I~'-b

IIIIIIIIIIIIIIIIIII

096084

T7893 : probeble mlcro-dolerlte,(po••lble but le•• 11kely e beeelt);

CJ\ J k1(,0./kt\"\oc weekly mlcroparphyrlt1c;pyroxene completely urelltleed,pleglocleae pertly eeuaeurltleed;(vlrtuelly the aeme .a T7891)

~egto~l~~.!.. phenocry.ts (1IL':...~~), .bout 0.15 _

.re randa-ly .c.tt.red •• lndlvldu.l••nd r.rely ln clumps.Thne occur ln • ground•••• 0' renda-ly dlepoeed much em.Uer~~eglo~!e~e l.th., loo.ely .ggregeted wlth e alml1er &mount 0'.quat, equant Pjroxene cryatals, whlch have been completelyunlltleed.

Interatlcle. throughout thla .ggreg.te .re occupled by

turbld, 111-de'lned ur~ltl~ .lteretlon products .'term.'lc gl!~e,

.1.0 crowded by extremely 'lne Fe/Tl oxldes (.lthough therock 1. 'non-..gnetlc'.)

The pleglocl.ae phenocryst. .nd ln the groundmee. leturbld due to .1nor ••u.surltlc .lter.tlon.

Mlnor veln••nd clu.ters 0' 'lne .ctlnolltlc-hornblendeere .c.tt.red, .a aegreg.tlona ·0' urelltlc alt.ratlon producta.

~

I~ 09()O85

IAPPENDIX 4

SOIL SAMPLE STATISTICS

I GRID CAE No. of Sanq:>les I 248

I ElementRange of Mean (ml Standard M+ 2 (f Critical Point.Values D"viation (q')

Cu bId - 250 35.76 39.87 115.5 26 47 90

I.

Pb bId - 150 21.29 18.13 57.5 56

Zn 5 - 330 46.77 53.24 153.3 54 125

ISn bId - 40 4.83 4.59 14.0 12

IGRID CAL No. of Samples 132

Element Range of Mean 1m) Standard m+ 211 Critical PointsValues Deviation (0')

ICu 5 - 220 76.52 45.60 167.7 30 100

IPb 5 -4600 100.61 434.18 969.0 110 380

Zn 10 -2750 107.12 260.73 628.6 27 120 370

Sn bId -1000 23.24 95.72 214.7 12 43

I W bId - 90 3.52 11.80 27.2 10

I GRID CAF No. of Sanq:>les 330

I Elemsnt Range of Mean (m) Standard m+ 2d critical PointsValues Deviation ld)

Cu bId - 185 60.64 32.50 125.6 24 42 85

I Pb b1d - 125 26.59 19.96 66.5 12 90

Zn bId - 205 48.83 27.54 103.9 15 38 140

I Sn bId - 180 10.48 21.40 53.3 10 35

W bId - 320 4.55 21.71 48.0 48

IS8lI1ples 146GRID CAJ No. of I

I ElementRange of Mean 1m) Standard m+ 2 d" Critical Points

Values Deviation (6)

I Cu 5 - 165 42.60 32.81 108.2 27 74

Pb bId - 60 17.77 12.05 41.9 42

I Zn 5 - 280 51.82 41.85 135.5 41 79

Sn bId - 35 7.86 5.28 18.4 18 24

Ni 5 - 105 34.01 22.49 79.0 24 68

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of!

Geological boundary

Strike and dip of bedding

Strike and dip of follatlon

Strike and dip of cleavage

Strike of vertical cleavage

Strike and dip of JOinting

Electromagnetic anomaly

mdr Mlcrodlonte and basalt

ss/ar Siltstone and argillite

tu/gw Tuffaceous greywacke/volcanlclastlcs

qt salss Mlcoceous quartz sandstone 8 siltstone .fets sa Feldspathlc sandstone 6 siltstone •&•

carb ss/sh Carbonaceous siltstone 8 shale , L 4880 N

LEGEND

Crimson Creek Formation

Ramsay Group

5398000 m N

8~.

GEOLOGICAL INTERPRETATION736

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LEGEND

COMSTAFF PROPRIETARY LIMITED

Geological boundary

Strike and dip of bedding

Strike and dip of foliation

Strike of vertical foliation

Strike and dip of c1eavoge

Electromagnetic anomoly

Proton Magnetometer anomoly

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Ramsay Group

Crimson Creek Formation

Meredith Granite

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62700

600

500

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300

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bk sh + qt

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