geological survey101,202 feet. sedimentary rocks of mesozoic age are exposed in the beaver mesa area...
TRANSCRIPT
IN REPLY REFER TO:
UNITED STATESDEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEYWASHINGTON 25, O.C.
ASO- 168/7 September 28, 1956
Mr. Robert D» NiningerAssistant Director for ExplorationDivision of Eav Materials17* 8» Atomic Energy CommissionWashington 25 » D. 0*
Dear Bo0t
Transmitted herewith are three copies of 23CI-449, Exploration
for -uraniuiB-^anadiTua deposits in the Bearer Mesa area, Mesa County,
Colorado* and Grand County e Utah, 1* "by L. J. Zicher, August 1956*
Sincerely yours,
O 4-
V. H» Bradley Chief Oeologist
f JAN " "» 2001
USE OHIiT
This docmaent consists of 5^ •t
UNITED STATES EEPABTMWE OF THE INTEKIOB
GEOLOGICAL
2XFLOBATIOH FOB URANIUM^VMADIUM DEPOSITS IH THE BEA?ZE H2SA .AIM
MESA COIOTT, COLOiRAn), >IKD GRAMD COUFI?r s
Augast 1956
Trace Elements Investigations Report
preliminary report is distributed witlaout editorial and technical rwisw for conformity with official standards and nomenclature* It. in not for -public inspection or
*This report concerns work done on "belaalf of the Division of Raw Materials of the U, S, Atomic
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USGS -
GEOLOGY MB MIJSOSRALOGT
'Series A) ' . No. of copiesAtomic Energy Commission^ Washington, .#.....»•»»•.»« 1Division ©f Raw Materials, Albuquerque. .............. 1Division ©f Raw Materials,, Austin .»,».......**»..» 1
Division ©f Raw Materials^ Casper ..............»** 1Division ©f Raw Materials, Denver .,.....*..»..««.* 1Division of Raw Materials, Ishpeming. ,.....,.....».• 1Division of Raw Materials, Phoenix. .......».....**« 1Division of Raw Materials, Rapid City ........*.....• 1Division of Raw Materials,, Spokaaor. .........*...». 1Division ©f Raw Materials*, Salt Lake City ............. 1Division of Raw Materials, Washington.. ....«....»*»«» 3Exploration Division, Grand Junction Operations Office. ...... 6Grand Junction Operations Office. *......»...»».«»» 1Technical Information Extension, Oak Ridge. ».....*....* 6U* S. Geological Surrey? . .....Fuels Branch, Washington. .*.......».....*.••** 1Geochemistry and Petrology Branch, Washington ........... 1G-eo'physIcs Branch, Washington ...»..».».....*••*» 1Mineral Deposits Branch, Washington ................ 2Pf C« Bateraan, Mei^jb Park. • .............»••»•»• -1A. L» Brokaw6 Grand Junction, ............».•»*.* 2K, Mo Denson, Demp®::% ....................... 1Ve L. free^ian. College. ..*.*..»...*.....*»*** 1Re L» Griggsp Al'buquergue .».....•...•.....».** 1W9 R» Reefer,' Laramie .»...»•.».»»»»..«.».**» 1M» R« Elepper, Spokame. ........'.............. 1A. H« Koschmanm» Iten.Y©r «.......»....•«»....»* 1L r, R. Page, Washington. ..»...............»..* 1CU D. Sing«wald9 .3@ltsville ...#...............« 1Ao E«' Weissen'born, Spokane. .................... 13?EPCO, Denier »•....................»»••* 2T3JFC0 0 RPS' 0 Washington, (including master). ..... e ...... 2
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CONTSM'S
Abstract ................................ 5Introduction .............................. 6Geology. ................................ 10TJraniiasHvanadium deposits* ....................... 12Guides to uranium-vanadium deposits* .................. 1^U. S. Geological Surrey exploration, .................. 15Reserves ................................ 16
Indicated and inferred reserves .................. 17Definitions. ......................... 17Thickness cutoff ...................... .21Grade cutoff ......................... 21Calculation of tonnage .................... 22Calculation of grade ..................... 23lesezre blocks ........................ 23
Potential reserves* ........................ 2^fPlans and recommendations. ....................... 25Literature cited ............................ 26
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ILLUSTBAJTIOHS
Page
1. Index map of part of the Colorado Plateau snowing the location of the Beaver Mesa area, Mesa County, Colo., and Grand County s Utah ................ 8
2. Generalised section of the strata overlying the Entrada sandstone in the Beaver Mesa area, Mesa County, Colo,* and Grand County, Utah ................ 11
3* Geologic map of the Beaver Mesa area. Mesa County sColo*, and Grand Co-onty, Utah. ............ In envelope
4. Geologic maps and sections of blocks A, C, F, I, and J, Beaver Mesa area* Mesa County, Colo., and Grand
, Utah ..................... In envelope
TABUS
Table 1* Summary of total production of urani-um-vanadiiim deposits, Beaver Mesa area, Mesa County, Colo., and Grand County6 Utah. ....................... ~ . 9
2. Suamary'of indicated and iiaferred reserves 1 foot or sore t-hiekp Beaver Mesa area9 Mesa County, Colo. t and Grand County, Utah. ..................... 18
3* Detailed summary of indicated and inferred reserves, 1 foot or more thick, Beaver Mesa area, Mesa County, Colo*, and Grand County, Utah ............. 19
4. Assay data, Beaver Mesa area, Mesa County, Colo., andGrand County, Utah* .................. %7
OFFICIAL USE OKLY
gmoijg. USE
aJCPLOBAKON TOE TOAHIUM-VMADIUH DEPOSITS IN THE BEAVER MESA ABBA,
MESA COOTTT, COIiOBABO, JOO) &RAS03 COU1TT, UTAH
By L. J. Eieher
ABSTRACT
The U* S. Geological Survey explored the Beaver Mesa area from May 4-,
1953* to October 30, 195^. with 212 diamond-drill holes that totaled
101,202 feet.
Sedimentary rocks of Mesozoic age are exposed in the Beaver Mesa area
and are, from oldest to youngest, the Morrison formation of Jurassic age,
the Burro Canyon formation of Early Cretaceous age, and the Dakota sand
stone of Early(?) and Late Cretaceous age*
All of the economically significant uranium-vanadium deposits are in
the lenticular sandstones within the upper one-half of the Salt Wash member
of the Morrison formation. The deposits consist of sandstone impregnated
and replaced "by uranium- and vanadium~b earing minerals* The ore masses are
the thicker parts of the tabular, blanket like uranium-vanadium deposits*
Ho persistent trends are apparent in these deposits*
The ore masses in the Beaver Mesa area range in size from a few tons
to several thousand tons. The ratio of uranium oxide to vanadium oxide is
about lt^ in the Beaver Mesa area as compared to an average oxide ratio of
X&6 in most of the deposits of the Uravan mineral belt.
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OFHOIAL USB OKLY
6
Guides to uranium-vanadium deposits in the Beaver Mesa area are:
1* The mudston® in contact with the sandstone is green or gray green,
2. The sandstone contains thin discontinuous green muds tone lenses,
thin zones of green mudstone peVble conglomerate, and abundant fragments
and masses of carbonaceous material*
3* fhe sandstone is light gray or light "brown and is medium fine to
medium grained, ,
4. The sandstone contains limonite stain, limonite spots, or dis
seminated pyrite.
5* The or® masses generally occur in the thicker part of the sandstone*
Indicated and inferred reserves of Class I material discovered "by the
U. S. Geological Survey drilling total 34»245 short tons averaging 0,46
percent U^OQ and 1.89 percent V20*. Inferred reserves discovered fey private
drilling total 230,000 short tons averaging 0*30 percent U^Og and 1*25
percent V2°5* Potential reserves totaling 100,000 short tons averaging
0.30 percent ILQg and 1*25 percent YJ>- are estimated for the Beaver Mesa
area*
INTRODUCTION
fhe U. S. Geological Survey exploration of the Beaver Mesa area had a
two-fold pisxposeg (l) to search for new nimble uranium^vanadium deposits
and (2) to obtain data for an appraisal of the potential uranium-vanadium
reserves of the Beaver Mesa area* The ground explored would not have "been
drilled *by private companies "because of excessive depths and lack of nearby
deposits,
OFFICIAL US! Om,T
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7\
Btanrer M®@a area is about 6 miles southwest ©f Gateway, Mesa County,
Col©, (fig. 1)1 . Sh® area, comprising about 12 aqpar* miles, is roughly
rectangular, and is bounded on the north and east by th® BDlores Eiv®r t oa
the south by Jolan Brown Canyon, and on the w«st by B®av©r Cr««k Sanyos:."
Ih« ®xj>l©r®d part of th® area includ®® parts of S®QS. 1, 2 e and 11 1 f. 50 I.,
E. 20 W*s s«c. 31, T. 51 H. f 1. 19 W.j s®cs. 14, 23, 24, 25, 26, 35» and 36,
T* 51 H», H. 20 W* f lS[«w Mexico principal meridian, Mesa County, Colo.f and
s®e. 33, 0?. 24 S» t E. 26 S» and ®e©s. 4, 5^ 8, 9, 16, 17, and 20, 9?. 25 S.,
E* 26 S., Salt Lak® meridian, Grand County, Utah.
The altitude of the area ranges from 6,900 feet in the east-central
part t© 7f900 feet in the southeastern part. !Phe relief is generally slight
to mod®rat®, but eer®ral abrupt cliffs make access difficult locally. £h®
T®getation consists ©f pine, pinyon, and jimiper on rock outcrops and sage
brush and grasses on the alluvial flats* The cliraat® is a ©ad arid.
fhe Bearer Mesa area is accessible by 12 miles of Gbrernment access
road that connects with Colorado Highway 141 half a mil© south of Gateway,
001©. Ifymerous truck trails connect important pa~"ts of the area*
The uranii2»»Tanadium deposits discoTered by U. S. Geological Surrey
drilling are in the central and east-central part of the BeaTer Mesa area*
All of the deposits are on claimed ground* Production of the mines in the
Bearer Mesa area, through December 1955» totals about 55*000 short tons of
ore averaging 0.43 percent U^Og and l.?6 percent T^O^ (table l)*
QUIT
BEAVER MESA AREA
SAN MIGUEL
Uranium-vanadium mill ,Truck trail
DOLORES
. FIGURE l.—— INDEX MAP OF PART OF THE COLORADO PLATEAU SHOW!NGX THE LOCATION OF THE BEAVER MESA AREA, MESA COUNTY, COLCu, AND GRAND COUNTY, UTAH.
Tabl
e 1.
—Sum
mary
of
tota
l production of ur
aniu
m-va
nadi
um d
eposits, Beaver Mesa
area
,
Jfesa County,
Colo
,, an
d Gr
and
Coun
ty,
Utah.
Mine
or
claim
name
Ajax
Corv
usit
e
Canyon H
o. 4
Total
knowi production
through
Dec. 31,
1955
Shor
t tons
272
11,0
83 205
Percent
average
grad
e
U308
0.19
0.63
0.32
V2°5
1.15
2.41
1.96
O
s
^
Ceda
r Po
int
20 fc!
Do
ctor
Jr.
cj
Cher
okee
sha
ft
m
&
r I&
Salle
g
o£
&
La Sal
1r-i
^«
La Sal
2 (Ukele)
3
^ La Sal
2 (Gilmore)
Lumsden
1
Lumsden 2
Lumsden
3
Pack
Rat
1
Prospect 2
Rae Marie
3
Rae
Mari
e 6
2,32
8 82
3,59
^
5,098
110
1,84
8
602
2,28
8
8,44
8
4,114
11,4
60
1,727
775
1,46
4
0.50
0.42
0.41
0.42
0.22
0.47
0.33
0.36
0.40
0.31
0.33
0.32
o.4o
0.49
1.42
1-95
1.51
1.24
0.92
1.57
1-55
1.88
1.59
2.01
1.55
2.39
1.06
1.54
o
o a i R
Tota
ls
OI!H0.1AL USE OH1T
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report g-ommarizes the results of the U« S. Geological Surrey
exploration and contains a brief description of the geology and the
uranium-vanadium deposits of the Beaver Mesa area* The exploration was
done on behalf of the Division of Raw Materials of the U. S. Atomic Energy
Commission*
GEOLOGY
Sedimentary rocks of Mesozoic age are exposed in the Beaver Mesa area*
These rocks are, from oldest to youngest, the Morrison formation of Juras
sic age, the Burro Canyon formation of Early Cretaceous age, and the Dakota
sandstone of Early(?) and Late Cretaceous age (fig* 2). The stratigraphy
of the Morrison and related formations has been discussed in detail by
Craig and others (1955)* Older Mesozoic and Paleozoic sedimentary rocks
and Preeambrian igneous and metamorphic rocks are exposed to the east and
have been discussed previously (Cater, 1955)*
The rocks in the Beaver Mesa area dip at low angles (5° maximum) in a
northeasterly direction toward the axes of the Sagar's Wash (Dane, 1935)
and Dolores (Cater, 1955) synclines* Mapping and exploratory drilling dis
closed that Lumsden Canyon, which transects the major uranium-vanadium pro
ducing part of the Beaver Mesa area, developed along a vertical fault zone
(fig* 3). The fault 2one strikes K* 70°-80° E», and beds have be®n dis
placed as much as 90 feet*
USE omr
SY
STE
M
CRETACEOUS
o to CO
££.
FO
RM
AT
ION
Dakota
sa
nd
sto
ne
Bu
rro
C
an
yon
fo
rma
t! o
n
Horr
i so
n
form
at
ion
Su
mm
erv
i 1
1 e\
fo
rma
t 1 o
n
En
tra
da
sa
nd
sto
ne
TH
ICK
NE
SS
ab
se
nt-
90
200-2
10
320-3
60
260-3
00
30-4
0
CH
AR
AC
TER
Lig
ht-
red
and
ligh
t-D
row
n
sand
ston
e an
d co
nglo
mera
te.
Min
or
amou
nts
of
yra
y an
d ye
llow
sh
ale
s F
orm
s lo
w cliff
s.
Lig
ht-
gra
y
and
liyn
t-b
row
n
sand
ston
e.
Consi
dera
ble
gr
een
roud
ston
e.
Locally
m
ay
conta
in th
in,
dis
co
ntin
uo
us,
cne
rty
1 im
esto
ne
oeds
. Fo
rms
pro
min
en
t cliffs
Bru
shy
Basin
m
em
be
r:
Va
rico
lore
d m
ud s
tone
. So
me
thin
sa
ndst
one
and
cong
lom
erat
e le
nses
. Fo
rms
slop
es
Salt
wa
sh
me
mb
er:
int e
rst r
atifie
d lig
ht-
red
, Ijgnt-
gra
y,
and
ligh
t-cro
wn
sa
ndst
ones
an
d re
d > m
ud s
tone.
Form
s a
se
rie
s o
f cliffs
and
benc
hes
Red
. sa
ndy
mud
sto
ne.
Thi
n be
dded
Red
an
d w
hite
mas
sive
sa
ndst
one.
Fo
rms
smoo
th,
roun
ded
cliffs
FIGURE 2. GENERALIZED SECTION OF
TH
E STRATA OVERLYING TH
E ENTRADA SANDSTONE
MESA AREA,
MESA COUNTY, COLORADO AND GRAND COUNTY, UTA
H.IN
THE
BEAVER
OFFICIAL USS OHLY
12
All of the significant uranium-vanadium deposits found in the Beaver
Mesa area ar® lenticular sandstones in the upper half of the Salt Wash member
of the Morris@n formation* The sandstones are light red, light gray, or
light "brown and are medium fine to medium grained*
Th@ mudston® in contact with the sandstones is generally red* However,
in the vicinity of uranium-vanadium deposits the mudstone in contact with
the sandstones is gray green* Although the reason for the difference in
color is not fully understood, the gray-green mudstone in contact with the
sandstones is a useful target for exploration "because it extends some dis
tance "beyond the limits of the uranium-vanadium deposit*
A general discussion of the geology and habits of the uranium and
vanadium deposits of southwestern Colorado is given "by Fischer (l9^2)<» A
description of the MUravan mineral "belt," an elongate strip in which the de
posits are larger and of higher grade than in other areas 9 is given "by
Fischer and Hilpert (1952). This "mineral "belt 1" extends westward across
Beaver Mesa, and all of the significant uranium-vanadium deposits are within
its "boundaries*
TJRANnrn-TAHADHJM DEPOSITS
The uranium-vanadium deposits in the Beaver Mesa area consist pre
dominantly of sandstone impregnated and replaced "by uranium- and vanadium-
"bearing minerals. Also thin madstone seams, "beds of mudston® pe"b"bles 9 and
zones of carbonaceous material are commonly th® sites of rich concentrations
of uranium?- and vanadium-bearing minerals. The significant uranium-vanadium
deposits in the Beaver Mesa area are of the unoxidissed (or only partially
OFFICIAL USS ONLY
uss om,i
13
oxidi&ed) iiranteffl'-'fBssadi'ffli type, commonly called ^"black ores® (Weeks and
Thompson, 195*0 • ^h® principal ore minerals are the uranium-hearing minerals
uraninite and coffinite and the vanadium-bearing minerals montroseite*
The uranium-vanadium deposits are tabular or lens-shaped masses that
are generally parallel to the "bedding in the sandstone "but may cross cut
bedding in detai!9 The uranium-vanadium deposit consists of several ore
masses connected "by thin seams of mineralized material* The ore masses are
the thicker parts of the "blanketlike mass* Ho persistent trends are apparent
in the uranium-vanadium deposits, "but several of the ore masses exhibit a
northeast elongation* Also, mineralized fossil logs within the uranium-
vanadium deposits have a northeast orientation*
The ore masses in the Beaver Mesa area range in size from a few tons
to several thousand tons* They are irregular in outline and range in,area!
extent from a few hundred square feet to several thousand square feet*
The ratio of uranium oxide to vanadium oxide in most of the uranium-vanadium
deposits in the Morrison formation in the Uravan mineral biut is about Is6*
However, production records and assay data from diamond-drill holes indicate
the oxide ratio is about l!^ in the Beaver Mesa area*
<anar
OFFICIAL USE QUIT
QUIISBS TO wmim-vmmm DEPOSITS
Certain geologic f eatures are commonly associated with uraniuro-
Yanadium deposits. The importance of these features as guides to ore has
"been studied "by Weir (1952) . f he guides that are -used in the Bearer Mesa
area are modified versions of those presented by Weir. H® single geologic
feature can fee used to define ground as favorable or unfavorable for the
occurrence of uranitun-vaaadlum deposits, but a reasonably ace-orate delimi
tation can be made by evaluating all the various geologic features*
Surface and subsurface geologic data indicate that the following geo
logic features are associated with known uranium-vanadium deposits in the
Beaver Mesa area and are useful as guides to oret
1. The muds tone in contact with the sandstone is green or gray green*
2. The sandstone contains thin discontinuous green mads tone lenses,
thin zones of green mudstone pebble conglomerate, and abundant fragments
and masses of carbonaceous material.
3. The sandstone is light gray or light brown and is medium fine to
medium grained.
4*. The sandstone contains limonite stain, limonite spots, or dis
seminated pyrlte. Many specimens of drill core show pyrite partly oxidized
to limonite*
5* The ore masse© occur in the thicker part of the sandstone. How**
ever, the ore masses $0 not exhibit any detailed relationship to the thick-*\
ness of the sandstone.
USB OSLY
OITIOIAL USE ONLY
15
Several other features were evaluated in an effort to develop addi
tional guides for exploration. These were* gamma-ray values at the con*
tact of the sandstone with the underlying mads ton®, maximum gama-ray
values within the sandstone, structure contour maps, variations in thick
ness of the sandstone units, variations in thickness of the underlying
green mudstone, and trends of major sandstone units* Of these, the most
useful was the relatively high gamma-ray anomaly at the "base of the sand
stone* This anomaly was found in the vicinity of uraniuaHvanadium deposits
and offered a larger target than the uranium-vanadium deposits because it
extended "beyond the limits of mineralized material*
U. S. GEOLOGICAL SUHTOI EXPLORATION
U. So Geological Survey exploration in the Beaver Mesa area started
on May 4, 1953, and was completed October 30, 1954. Boring the period,
212 diamond-drill holes were completed on two separate contracts for a total
of 101,202 feet, of which 31,074 feet were core drilled* The core recovery
averaged 93 percent* The average depth of holes drilled was 477 feet*
Of the 212 holes drilled, 71 penetrated mineralized material (material
containing 0*020 percent or more U^Os and/or 0*10 percent or more ^0^, Tmt
less than 0.10 percent U^Qs and/or 1*0 percent V£©5 ®r less than 1*0 foot
thick regardless of grade), and 20 penetrated mineralized material that
is in the highest reserve class used in this report (material 1*0 foot ®r
more thick and containing 0,10 percent or more IT^Os and/or 1*0 percent or
more YoO<)* All of the holes were drilled on claimed ground*
omcxjx, USB
OFFICIAL USS pug
16
.Approximately 40 percent of the footage was utilized in widely spaced
holes, 1,000 to 3,000 feet apart, to obtain geologic information that would
"be useful in th® search for uraniiai^vanadium deposits, and to determine the
location and general trend ©f favorable ground in unexplored areas*
Jteproximately 50 pereeat of the footage was utilized in moderately spaced•K'db f v «r .£» ^ur -w ^
holes, '200 to 500 feet apart, .to search for uranium«Tanadii» deposits in
geologically fanrovabl* ground* $>out 10 percent of the footage war-utilized
in closely spaced holes, less than 200 feet apart, to "better define the size
and configuration ©f some uraniiaa-Tanadium deposits discovered "by wider
spaced drilling*
The terns w indicated18 and 0 3uferred«> reserves are applied to the uranium-
and YanadiTM^bearing material in the deposits that are known from exposures
in outcrops, mine workings, or drill holes* The method used in calculating
the reserves is explained "below* Figures expressing the calculated tonnage
and grade of th<§ indicated and inferred reserves for each reserve "block are
giTen in tablo 1* The ground containing the reserre "blocks is shown in
figures J and 4* Several geologic sections showing the position of the
mineralised rock in the ground is shown in figure 4*
In addition t® the known, deposits, other deposits are pro'bahly present
which haTe n@t yet "been found* These deposits are predicted solely on
interpretation ©f gsologic evidence, for there is no physical proof of their
existence* The fern ^potential" reserves is applied t@ the material in
these deposits* Potential re@@rres are described on pag@ 2^*
OFFICIAL T1S3S QUIT
17
Although, reserves are not classified in this report according to
their availability for mining, consideration was given to the 1955 mining
and milling practices in selecting the thickness and grade* This was done
to obtain figures for a category of reserves that would express as nearly
as possible the tonnage and grade of the material that might actually be
mined from these deposits under 1955 conditions* A summary of indicated
and inferred reserves in this category is given in table 2* A detailed
breakdown of reserves by grade and thickness cutoffs and by block number
is given in table 3»
Indicated and inferred reserves
Definitions
Known reserves are classed as indicated and inferred* Owing to the
erratic variations in thickness and grade of uranium-vanadium within short
distances and the general lack of abundant sample data for individual re»
serve "blocks, the amount of reserves that can be calculated within a small
limit of err03?, and thus can be classed as "measured," is so small as to be
nearly negligible* Therefore,, reserves that might be classed as measured
are included with indicated reserves*
USS OHLT
8 1
p- ? i 01 ct ro vn I &
Infe
rre
d
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O
(9
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l P
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O
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ro i p vn ro 8 I H H vn
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ro
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Rese
rves
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Percent i V
s? o P (D
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S c*- S Hi
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OFEECIH, USE ONE!
Table 3'—Detailed summary of Indicated and inferred reserves-^ 1 foot or more thick,
Beaver Mesa area, Mesa County, Colo., and Grand County, Utah.
(based on U. S. Geological Survey drilling, 1953-51*)
Block Location
No. (claims)
A La Sal Ho. 7
J.W.L. Frac. No. 1
B Lot Ho. 1, sec. 35
C Thornton
D La Sal Ho. 25
E Bonanza No* 1
T La Sal NOB. 31-32
Bonanza ROB. 5 and 7
G Pack Rat HOB. 1-2
H Curecantl
I La Sal Ho. U
Rajah No. 1
J Rajah Ho. 13
K Lost Dutchman Ho. 8-/
L Rajah Ho. 28
BV-39A
BV-139
BV-ll*2
BV-151
BV-156
BV-161
Totals
INDICATED
Grade cutoff 0.10
percent U,0g or
1.0 percent VgO-
Short
tons
669
*,$6
1,301*
1^3
6,982
Percent
U3°8
0.51*
0.58
0.27
0.36
0.50
V>5
2.15
1.03
1.1*2
2.65
1.35
Grade cutoff 0.05
percent W-Og or
0.50 percent VgO-
Short
tons
869
l*,3l*6
1,301*
1^3
6,982
Percent
U3°8
0.5!*
0.58
0.27
0.36
0.50
V2°5
2.15
1.03
1.1*2
2.65
1.35
INFERRED
Grade cutoff 0.10
percent U~0g or
1.0 percent VgO
Short
tons
1*,880
7,»*38
1*,075
673
729
2,062
842
1,178
1,961*
1,515
1,178
729
27,263
Percent
U3°8
0.5!*
0.58
0.31
0.11
0.18
0.30
0.06
0.31
0.18
0.60
1.00
0.69
0.1*5
V2°5
2.15
1.03
1.81
1.27
4.88
2.63
l.lH
0.63
1.52
5.83
3-39
3.18
2.02
Grade cutoff 0.05
percent U^Oo or
0.50 percent VgO^
Short
tons
l»,880
7,^92
4,102
673
729
2,062
81*2
1,178
1,961*
1,515
1,381*
729
27
52
38
61
31
31*
27,792
Percent
U3°8
0.51*
0.58
0.31
0.11
0.18
0.30
0.06
0.31
0.18
0.6o
0.87
0.69
0.08
0.07
0.13
0.07
0.07
0.05
0.1*5
V2°5
2.15
1.03
1.81
1.27
4.88
2.63
l.ll*
0.63
1.52
5.83
2.81
3.18
0.73
0.1*3
O.OU
0.11
0.32
0.32
2.02
-/ Assay values have been decreased from I* t 70 percent U^Og and 15*91 percent
obtain more realistic figures for contained UO and VO.
to
OFFICIAL USB ONLY
uss OIELY20
Indicated reserves J are thos® for which the grade is computed from
drill-hole samples and for which the tonnage is computed by projections
for a reasonable distance on geologic evidence from drill holes* Inferred
reserves are those for which quantitative estimates are based largely on
broad knowledge of the geologic character of the deposits and for which
there are few* if any, samples or measurements*
Because of the variations in thickness and grade of ore and the
scarcity of sample data« the indicated reserves in any single reserve block,
might actually amount to as much as twice the calculated tonnage or as little
as one-half the calculated tonnage. The limit of error of the total tonnage
for several blocks „ however, is apt to be considerably lower, perhaps not
more than 25 percent of the calculated tonnage* For this reason indicated
reserves are not computed for single holes in reserve-grade material that
have not "been offset or cannot be connected with known deposits or mine
workings. The limit of error in the tonnage figures for inferred reserves
is apt to be higher than for indicated reserves. The possible limit of
error in the calculated or estimated grade for both indicated and inferred
reserves probably is somewhat smaller than the possible limit of error ia
the tonnage figures*
J The definitions used here for indicated and inferred reserves are
abstracted from the definitions adopted by the U. S, Bureau of Mines and
the IT. S. (Geological Survey in .April 19^-3*OFFICIAL TJS1 OHLT
omg21
.Although miming practices mry throughout the region as well as with
individ-oal ®perat©rs d tm&sr 1955 mining conditions most ore "bodies of aver*
age grade are 'being mined t® where they thin to a layer about 1 foot thick*
Layers of material less than 1 foot thick are mined in places if the grade
is high* fhft tonnage of minable material less than 1 foot thick is small
with respe©t to the total reserves and for that reason reserves less than.
1 foot thick are not calculated*
Grade cutoff
The deposits contain two metals of economic importance, uranium and
vanadium* The oxides of these metals, U^Og and ^05, occur in an average
ratio of about 1$^ as estimated from the assays of the U. 3. Geological
Survey drill core from the Beaver Mesa area* Within the deposits ft however,
the two metals are so erratically distributed that a single sample„ such as
that obtained from a drill hole, is not necessarily representative of the
metal ratio or grade of the material near the point sampled* Knowing this
by experience, the miner will drive toward a drill hole that shows a good
value in vanadium, even though the uranium content of the sample mi^it be
negligible* Tfeas the material in the vicinity of this sample must be
classed a® a reserve, even though the sample shows a value for only one
metal, lurthermore, with the 1951 price schedules (U* S» Atomic Energy
Commission, 1951) f9r ore, the vanadium content of ore containing the normal
osdde ratio (is4-} constitutes about one-fifth of the market value of the
omciAi, uss OSH,Y
OFFICIAL USS OHLT
22
ore* Thus both metals mast lie considered in reserre appraisals and in
selecting grade cutoff•»
Keserves 1 foot or more thick are classified "by two grade cutoffs*
The higher cutoff—*0*10 percent UoOg or 1.00 percent V^^**"001^®8!*021^13 *®
the tJ* S« Atomic Energy Commission purchase cutoff for uranium and the
commonly used mill cutoff for vanadium* Eeserves are figured also ©n a
lower cutoff—=0*05 percent TJ^Os or 0*50 percent Vg^—°n *^* possibility
that conditions in the future might demand or permit the mills to accept
lower grade ore*
Calculation of tonnage
The method used for calculating the volume, and hence the tonnag®,
of a reserve unit 1 foot or more thick is based upon the premise that
the reserve unit is a uniformly tapered mass* The average thickness of
the drill-hole samples that can be combined within the specified grade
class is assumed to be the average thickness of the reserve unit*
By definition, the tonnage of the indicated reserves is computed by
projection for a reasonable distance on geologic evidence. In some places
in the Beaver Mesa area, indicated reserves are projected where correlation
of samples is good between drill holes that are not more than 100 feet
apart. On the other haade indicated reserves are not projected more than
25 feet beyond sample points, where the edge of the deposit has not been
located or where correlation of data between, sample points is lacking*
Reserve® are classed as inferred rather than indicated if the projection
OFFICIAL TOE OS&T
TOS oiar23
exceeds these lengths* Inferred reserves are projected to the assumed
limits. of the deposit s, a® determined by geologic evidence and interpre-
A constant of 14 cubic feet per short ton, is used to calculate
tonnage*
Calculation of grade
Th© average grade of the indicated reserves is calculated by weighting
the assay Tallies of all samples that qualify as reserves within the grade
and thickness limits* As strict grade cutoffs are used, it is generally
expected that the aTerage grade assigned to the reserve blocks will b®
somewhat higher than the average grade of the ore that will be eventually
mined from them, owing to the unavoidable dilution of the ore with waste and
low-grad® material during mining* On the other hand, the tonnage assigned
to th®se blocks should be somewhat lower than the tonnage mined from them,
owing to the increment of waste and low-grade material*
Reserve blocks
Masses or units of mineralized rock that constitute an indicated or
iaf erred reserve*, as defined by the thickness and grad® cutoffs* are called
reserre blocks* Th© geometric limits of reserv® blocks are determined by
the rules used in calculating reserves (see abov®)* Th© exact positions
of the blocks are not shown on figures 3 and 4 though the uranium^ranaditam
le$aring ground that contains the blocks is designated by block nwab®rs.
Where mineralised layers &rerlap9 eTem though they contain two or more
OFFICIAL TJS38
OFFICIAL US35 GHLI
masses of resewes, a single block number is assigned, and the total tonnage
of these masses, as well as their weighted grade, is shown on table 2* In
addition, private drilling has discovered 230,000 short tons averaging 0*30
Potential reserves are estimates of the amount of reserve material
that is probably present in deposits that have not been discovered, t® date,
but whose presence is predicted on the "basis of geologic reasoning* About
100,000 short tons of potential reserves are predicted for the Beaver Mesa
area* These reserve masses are 1 foot or more thick and probably contain
about 0.30 percent U^Og and about 1*25 percent VgOe* Approximately one-
half of these potential reserves probably are contained in deposits ranging
from 1,000 to 5»000 short tons in the vicinity of the lumsden groi^j of
mines* Tb.® remaining potential reserves are probably contained in small de~
posits, less than 1,000 short tons, throughout the favorable and mineralized
areas in the,central and east-central part of the Beaver Mesa area* Blocks
D and 22 (fig* 3 and table 3) are typical examples of these small reserve
OFFICIAL USE 01LT
Ho additional exploration is planned "by the U» S* Geological Surrey
for the Bearer Mesa area* Because of excessive depth to the ore-bearing
strata, exploratory drifting and midergroimd drilling would probably be
a less expensive method ©f developing additional reserves* However, sereral
large farorable amd mineralised areas in parts of sees* 25 and 36, f» 51 ^»»
E. 20 ¥»-? and part of see* 1, T* 50 V«, E» 20 W», Hew Mexico principal,
meridian, Mesa County, C©1®« need additioaaal exploratory drilling (fig* 3)«
This drilling, if it cannot be supported by priTate capital, might merit
G-oTernment participation*
OSTIOIAL USB QUIT
26
CITED
Cater, F. ¥., Jr. 9 1955s Geology of the Gat sway quadrangle. Colorado 8 tf. S. Oeol* Surrey B Geologic Quadrangle Map 55»
Craig, Lo Go, Holmes 9 G» H«, Cadigan, R0 A., Freeman, Y, Loe Mollens, T. l» f and Weir, G« W.» 19551 Stratigraphy of the Morrison and related forma tions, Colorado Plateaai region, a preliminary reports U. S. Geol, Survey Boll. 1009-3S.
Dan*, C. H«, 1935 9 Geology of the Salt Talley anticline and adjacent areas v Grand County, Utahs U» S. <Jeol. S-onrey Bull* 863*
Fiseller, E. P0p 19^2 0 Vanadium deposits of Colorado and Utah, a preliminary report? U. S* Qeol* Surrey Bull. 936-Pt p» 363-39^*
Jlschert H. P,» and Hilpert, L« S. f 1952» Geology of the tTraran mineral "belt? IT. S. Geol. Survey Bull. 988-At p. 1«13»
IT. S. Atomic Energy Commission, June 1951* Domestic Uranium program,, Circ. 6.
Weeks, A. D. „ and Thompson, M. E. f 195^i Identification and occurrence of uranium and vanadium minerals from the Colorado Plateaus; U. S, Geol* Survey Bull. 1009-B.
Weir, 33. B* 9 1952» Geologic guides to prospecting for carnotite deposits on the Colorado Plateaux IT. S. Geol. Survey Boll. 988WB, p. 15-27.
OFFICIAL USB OHIJ
QFFIQIAL USE Q
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_ -
Table
k.—Assay d
ata, Beaver Mesa
area,
Mesa C
ounty, Co
lo.,
and Gran
d County,
Utah
Geol
ogic
al S
urvey ex
plor
atio
n, 1953-5^«
Assays by
the
U. S.
Ge
olog
ical
Survey.
Equi
valent
\
Undet
Undetermined
e <
Less t
han
* Represents r
eass
ay val
ues
USE Q
" •——.U
-
Rock uni
ts co
ntai
ning
les
s than 0
.020
per
cent
UoO
g, less t
han
0.02
0 pe
rcen
t equivalent U
^Og, and
less
than
;|
0.10 percent VgOc, as
determ
ined
by ass
ay of
dril
l co
re,
are
considered to be
bar
ren.
Ba
rren
holes
and rock uni
ts are o
mitted from this t
able
. ^~
Gamm
a-ra
y da
ta o
btained by
pro
bing
drill hol
es w
ith
radi
omet
ric
logg
ing
unit.
Radi
oact
ivit
y (f
expresse
d as
percent e
quival
ent
UoOg
. Values l
ess than 0
.020
per
cent e
U^Og
are
om
itte
d from this
Sta
ble.
These
data a
re of do
ubtf
ul re
liab
ilit
y.
V
Assay
data l
isted un
der blocks A
-L a
re within
the blocks o
f calculated res
erve
s di
scus
sed
in thi
s ;
report.
jT
Assay
data u
nder "o
ther
hol
es"
are
within are
as f
rom wh
ich
no re
serv
es w
ere
calculated because th
e ,£]
.''samples
recovered ar
e to
o th
in or to
o weakly min
eral
ized
to
qual
ify for
the
selected gra
de a
nd
j^'
\th
ickness
cutoffs.
"*j^
Collar e
levations and ho
le l
ocat
ions o
btained by
tra
nsit
and s
todi
a survey met
hods
. f V-
OFFI
CIAL
USE
ON
LY '
Tabl
e 4. —Assay d
ata, Beaver
Mes
a area,
Mesa C
ounty, Co
lo.,
and Gr
and County,
Utah
,—Co
ntin
ued,
Assa
y da
taHo
le H
o. and
collar e
lev.
(feet)
Bloc
k A
BV-28
(7236)
BV-59
(723
9)
BV-6
3(7
254)
Dept
hFr
om
399-
139
9-7
to>.
5400.6
401.
514-01.8
1*03
.8404.2
•405
.0405*3
406.0
415-3
- 418.
04i8.5
418.8
418.
9419.2
419.
5
in feet
To 399-
740
0.5
400.6
401.
540
1.8
402.4
404.2
405.
0405.3
406.0
406.6
415.
6
418.
5418.8
41-8.9
419.2
419.5
419.
6
Thickness
(fee
t)
0.6
0.8
0.1
0.9
0.3
0.6
0.4
0.8
0.3
0.7
0.6
0.3
0.5
0.3
0.1
0.3
0.3
0.1
U308 0.37
1.82
0.49
0.082
Oo20
0.66
0.03
20.94
0.29
0.19
00025
0.15
0.0l
6e0.025
0.015
0.047
0.01
2e0.
31
Percent
V205
4.60
0.73
0.55
<0.1 0,29
4*37
0.15
5*73
1.01
1.81
0.39
4.30
0.52
2.12
1.67
0.62
0.33
1.24
CaC03
0.9
8.5
0.7
4.6
7.0
3*4
13*2 lo8
10.4
10.5 7*7
1,4^
7.0
1.4
/1.1
"19.4 Unde
t21.1
Gamm
a-ra
y da
ta
Per
cent
2.2
0.08
5 1.9 1.7
0.
11
0.21
0.07
8
Dep
thFr
om
398.
9 40
0.1
401.
1
403.
4 40
4.3
414.
9
418.
0
in f
eet
To 400.
1 40
1.1
401.
9
404.
3 40
5.7
415.
5
419.
1
Thi
ckne
ss
(feet)
1.2
1.0
0
.8 0.9
1.4
0.6
1.1
OFFICIAL USE O
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OFFI
CIAL
USE OI
3LY
29
Tabl
e 4.
--As
say
data,, Beaver Mesa
area,
Mesa C
ounty, Golo., and Gr
and Co
unty
, Utah,—Continued.
Assay da
taHo
le N
o. an
dcollar e
lev.
(feet)
Block B
BV-3
6(7219)
BV-6
2(7
229)
Depth
inFrom
401.9
402.
240
4.0
404.
740
5.3
406.8
408.3
4o8
094Q
9.5
4Q9.8
410.2
410.6
411.
4411.8
412.
7
426.2
432.
9^3
3*3
433.7
*433-7
435.2
435.5
436.7
438.3
438.5
438.
843
9.1
feet To 402.2
404.0
404.
7405.3
406.
840
8.3
408.9
^09-
540
9.8
410.2
410.
6411.4
411.8
412.7
413-5
426.
5
433.3
^33.
7435.2
435.
243
5.5
436.7
438.
3438.5
438.8
439.
1440.3
Thic
knes
s(feet)
0.3
1,8
0.7
0.6
1.5
1.5
0.6
0.6
0.3
0.4
0.4
0.8
0.4
0.9
0.8
0.3
0.4
0.4
1*5
1.5
0.3
1=2
1.6
0.2
0.3
0.3
1.2
U308
0.01
3e0.046
0.22
1.57
0.89
0.95
0.39
0.10
0.11
0.06
30.078
0.20
0.15
0.03
70.012e
0.03
7
0.14
1*53
0.59
0.63
0.13
0.03
3e0.
054
0.51
0.03
40.15
0.035
Perc
ent
V205
0.12
0.35
0.67
2.88
0.84
0.52
2.10
0.82
0.87
1.02
0.90
2.33
0.29
0.32
0.15
0.41
0.60
2.67
0.26
0.31
0.17
<0.1
<0.1 0.36
<0.1 0.14
<0.1
CaC0
3
Unde
t1.9
1.2
1.4
1.2
1.4
1.1
1.4
1.6
3-1
3.3
1.2
2.5
3.6
Unde
t
0.6
2.4
1.0
3.6
Unde
t4.
0Un
det
7.0
1.4
7-3
7.0
14.6
Gamm
a-ra
y data
Percent
eU308
0.090
0.035
0.03
81.5
0.36
1.1
0,05
50.
470.040
Dept
h in
From
402.8
403.
7to
*. 6
406.
4407.5
408.7
4Q9.9
412.2
413.4
feet To 403.
7404.6
406.4
407.
5408.7
409.9
412.
241
3.4
4l5«6
Thic
knes
s(f
eet)
0.9
0.9
1.8
1.1
1.2
1.2
2.3
1.2
2.2
0.13
424.0
424.
60.
6
0.41
1.
5 0.
55
0.04
9
0.04
0 0.
035
430.
4 43
1.6
432.
5 43
3 . 5
437.
6 43
9,4
431.
6 43
2.5
433-
5 43
6.3
439.
4 44
0.2
1.2
0.9
1.0
2.8
1.8
0
.8
OFF
ICIA
L U
SE
OHLY
-~
30
Tab
le 4
.--A
ssay
dat
a,
Bea
ver
Mes
a ar
ea,
Mes
a G
ottn
ty,
Gol
o,,
and
Gra
nd C
oian
ty,
Uta
h,—
Con
tinue
d«
Ass
ay d
ata
Hol
e N
o.
and
coll
ar
elev
. D
epth
(feet)
Fr
om
Blo
ck C
BV
-66
4ll
*6
(731
3)
412.
241
2.6
*4l2
.641
3.1
415.
041
6.2
416.
64l7
.l41
7.5
417.
841
8.4
418.
-741
9.3
420.
442
0.5
421.
742
2.9
423.
0
BV
-93
411.
4(7
234)
41
1.7
412.
441
3.0
413.
941
4.5
416.
6
in f
eet
To
412.2
41
2.6
413.1
413.1
413.
4
416.
241
6.6
417.
141
7-5
417.
841
8.4
418.
741
9.3
420.
442
0.5
421.
742
2.9
423.
042
3 .-3
411.
741
2.4
413.
041
3-9
4l4.
541
5.1
416.
8
Th
ick
nes
s(f
eet)
0.6
0.4
0.5
0.5
0.3
1.2 0.4
0.5
0.4 0.3
0.6 0.3
0.6
1.1 0.1
1.2
1.2
0.1
0.3
0.3
0.7
0.6 0.9
0.6
0.6
0.2
U30
8
0.0
40
0.3
40
.69
0.7
20
.03
8
0.03
50.
150.
571.3
80.
340.
052
0.14
0.06
8Q.
1TL,
0.17
0.40
0.34
0.16
0.0
27e
0.0
54
0.0
25e
0.1
10.2
8O
.Q97
0.03
80.0
65O
FFIC
IAL
Per
cent
V2©
5
0.64
0.24
0,28
.0.
26<
0o
l
0.1
2<
0.1
0.3
43°
130.4
0.
Oe3
60.2
60
.38
0.5
81
.04
1.35
3.13
2o44
0.2
1
0.1
80.9
31.5
01.
750.
700.
781.
66trs
^ OD
!T3Y
CaC
03
2.5
2.8
14
.2U
ndet
13.2 4.1
4.8
3.1
2.0 2=9
2.2
2.4
2.6
2.5 6.0
5.6
8.8
6.8
Und
et
2.8
1.5
1.8
1.9
1.8
1.6
1.6
Gam
ma-
ray
dat
a
Perc
ent
eU3©
8
0.023
0.032
0.14
0.042
0.034
0.82
0,13
0.84
0.27
0.49
0.46
0.03
4
Dept
hPr
om
311.
7
338.
4
351.1
384.
8
386.
6
409.3
^13*1
415
o 3
417.6
419.
2
4l2
04
4l6.
0
in feet
To 312*5
340.1
352.
1
385.
6
387.8
410.2
415-3
416.
4
418.9
421.
5
413.6
416.9
Thicknes
(fee
t)
0.8
1.7
1 = 0
0.8
1.2
' 0.
9
2.2
- 1.1
1-3
2.3
1.2
0.9
OFFI
CIAL
USE
'DUL
Y31
Tab
le 4
. — A
ssay
dat
a,
Bea
ver
Mes
a ar
ea,
Mes
a C
ount
y,
Cb
lo.,
an
<
Ass
ay d
ata
Hol
e N
o.
and
co
llar
elev
. (f
eet)
Dep
th i
nFr
omfe
et
ToT
hick
ness
(f
eet)
U30
8P
erce
nt¥2
05C
aC03
Blo
ck C
— C
onti
nued
BV
-96
(721
9)35
6.1
395.
3 39
6.2
*396
.2
396.
5 *3
96.5
39
6.7
400.
2 40
0.5
401.
1
415.
2
415.
7
418.
7
419.
6
427.
0
357-
6
396.
2 39
6.5
396.
5 39
6.7
396.
7 39
7.3
400.
5 40
1.1
401.
7
415.
5
416.
2
419.
3
419.
9
428.
2
1.5
0.9
0.3
0.3
0.2
0.2
0
.6
0.3
0
.6
0.6
0.3 0.5
0.6
0.3
1.2
0.06
1
0.04
6 0.
23
0.26
0.
83
0.85
0.
050
0.03
9 1.
16
0.04
3
0.02
3
0.02
1
O.O
Q9e
0.02
0e
0.0
27
e
0.21
0.03
0.03
0.13
0.
14
0.23
4.18
2.14
0.82
0.50
0.65
9.2
19.7
21
.5
Und
et
Und
et
7.5
4.7
2,9
3.8
0.7
0.9
3-4
1.5
8.0
Percent
0.058
0.02
5
0.18
0.98
0.98
0.034
0.025
0.029
Gamm
a-ra
y da
ta
Dept
h in fee
t From
To
344.5
345.5
356.2
395-2
399.
5
420.
4
425.4
345.
5346.8
357.1
396.0
400.3
418.
2
422.
3
427.
1
Thic
knes
s (feet)
1.0
1.3
0.9
0.8
0.8
1.4
1.9
1.7
OFFICIAL USE OHLY
, O
FFIC
IAL
USE
ON
LY32
T
at>
le 4. —
Ass
ay d
ata
, B
eav
er M
esa
are
a,
Mes
a C
omit
y,
Colo
.,
an<
Ass
ay d
ata
Hol
e N
o.
and
co
llar
elev
, (f
eet)
Blo
ck D
BV
-103
(7
514)
Blo
ck E
BV
-212
(7
377)
BV
-57
. (7
376)
Dep
th i
nFr
om
521.
4
527.
1 52
7.4
536,
453
6.7
537.
2 53
7*6
539-
1
447.
3 44
7.6
462.
6 46
2.9
463.
1 46
3.8
No
sam
plefe
et
To
522.
0
527.
4 52
7.8
536.
7 53
7-2
537.
6 53
8.2
539.
^
447.
6 44
8.2
462.
9 46
3.1
463
*8
464.
2
Thi
ckne
ss
(fee
t) X.
0.6
0.3
0.4
0.3
0.5
0.4
0.6
0.3
0.3
0.6
0.3
0.2
0.7
0.
4
U30
8
0.02
1e
0.02
1e
0.3
4
0.00
50
.07
4
0.2
2
0.0
21
O.O
lOe
0.3
0
0.1
4
0.0
18
0.4
8
0.0
60
0.2
0
Per
cent
V205
0.30
<0.
1 1.
65
1-55
0.
72
1.75
0.
10
0.1
0
1.0
8
3.2
3
0.2
5
4.3
6
Oo2
3 0
,25
CaC
03
0.8 0,4
1.1 0.7
4.4
Und
et
3*6
2.0 3.1
0.5
7.8
3*
2
Per
cent
0.09
0
0.03
7
0.03
0
0.04
3
0.8
8
0.45
0.03
5
0.39
0.4
00,
65
0.8
8O
oQ47
0,56
Gam
ma-
ray
data
Dep
th i
n f
eet
From
To
352.
2
353-
3
357-
3
520.
1
526.
0
537.
5 .'2
446*
5
461.
146
1.7
451.
8 45
2.9
^53.
8 45
5.4
353*
3
354.
6
521;0
52
6,5
53
8.3
44
5.2
44
7.3
461.
746
2.5
452.
945
3.8
455.
4 3
1.1
1-3
1.3
0.9
0.5
0.8
l.O
0.8
0.6
0.8
1.1
0-9
1.6
1.9
OFF
ICIA
L U
SE
OIL
Y
OFF
ICIA
L U
SE
OIL
Y33
Tabl
e 4.— Ass
ay d
ata,
Beaver
Mesa
area,
Mesa C
ounty, Co
lo.,
an(
Assa
y da
taHole N
o. and
coll
ar elev.
(feet)
Block F
BV-82
(7437)
BV-106
(742
2)
BV-1
Q7(743
9)
Depth
inFrom
591.
9 59
2.2
592.
5 59
2.8
592.
9
558.1
558.
4 55
8.6
565*
0
571*
8 57
3 = 3
570.5
571
. 7
573.8
574.
1 57
4.4
580.
2
feet To 592
o 2592,5
592=8
592.9
593^0
558.
4 55
8.6
558.
9
566.5
573.
3 573=5
571=
7 572.6
574.
1 57
4.4
574.6
580.7
Thic
knes
s (f
eet)
0.1
0.1
0.3
0.2
0.3
1 = 5
1.5
0,2
1.2
0.9
0.3
0,3
0.2
0.5
U308
loll
0.042
0.073
0.50
0.01
7e
0.07
5
0.18
0.06
6 0.
33
0.08
7
Percent
V205
11.42
0.49
0,31
11 06
2 0.
82
1,30
1.76
0.48
2.02
3°. 46
0.29
0.37
0.80
0.96
CaC0
3
0.9
Unde
t 0.
3 1.7
1.5
3.6
Unde
t
7.6
7 = 5
6, 3
5=2
2o5
Per
cen
t
0.90
0.0
21
0.0
24
0.9
1
0.0
26
0.37
0,31
Ool
8
Gam
ma-
ray
dat
a
Dep
th i
n f
eet
From
To
592.
059
2.7
592.
7 59
3<>6
598<
,1
5980
8
566=
0
572.
7 57
3*5
600
o 3
601.
1
569,
4 57
0=4
572.
1 57
2.8
579»
2
Thi
ckne
ss
(fee
t)
0,7
0.9
0.7
1.2
0.8
0.8
1.0
0.7
OFF
ICIA
L U
SE
OK
LI
OFFI
CIAL
USE
OHLY
34
Tab
le
4. —
Ass
ay d
ata,
B
eave
r M
esa
area
, M
esa
Cou
nty,
C
olo
.,
anc
Ass
ay d
ata
Hol
e N
o*
and
co
llar
elev
. (f
eet)
Blo
ck G
BV
-48
(705
5)
Blo
ck H
BV
-88
(727
8)
Blo
ck I
BV
-143
(7
386)
Dep
th i
nFr
om
251.
825
2.3
252.
6 25
2.9
253-
2
242.
1 24
2.7
244.
2
507.
9
509.
4
511.
0 51
1.3
512.
5
545.
555
0.3
552.
4 55
2,7
' 55
3.3
feet To 252.
3 25
2.6
252.
9 25
3.2
253.
3
242.
724
3.7
244.
2 24
5.2
508.
8
510.
4
5H
.3
512=
5 51
3.3
546.
655
0.9
552,
7 55
3.3
553.
9
Thi
ckne
ss
(fee
t)
0.5
0.3
0.3
0=3
0.1
0.6
1.0
1.0
1.0
0.3
1
.2
0.8
1.1 Oo
60.
3 0.
6 0.
6
U308
, 0.
13
0.01
7 0.
053
0.00
5e
0.77
0.
085
0.20
0.09
7
0.05
8
0.02
5e
0.03
7
0.11
0.00
6e0
0037
e0,
098
0.19
0.
043
Per
cent
V20
5
1.43
0.
82045
1.98
l.ll
1.33
0.
23
0.61
0.
26
Ool
2
<0.
1
<0.
1
0.1
1<
0ol
1.8
0
1.3
1
CaC
03
0.9
0.4
0°3
1.2
12.6
24
.9
22.6
10
.4
12.3
6
Und
et
Und
et
7.50
14
.31
Und
etU
ndet
6.33
6.
96
7.50
Percent
0.027
0.32
0.86
0.15
0.024
0*16
0.25
0.031
0.53
0.02
0
0.44
Ool2
0.024
Gamma-ray data
Depth
in fee
t From
To
261=6
262.2
265.
0
266
08
495.3
499.6
502.1
541.1
543 oO
543*
9
544.7
262.2
263.
5
265
09
267.
8
496.
1
501.
2 50
3^1
543.
0
543=
9 54
4*7
545.
9
Thic
knes
s (f
eet)
219.
2 220.3
1.1
251.
6 252.5
0.9
0.6
1 = 3 0.9
i.o
0.8
1.0
1.0
1-9
0.9
0.8
1.2
OFFI
CIAL
USE OKLY
OFF
ICIA
L U
SE
OHLY
55————
Tabl
e 4.—Assay d
ata, Beaver Mesa
area
, Mesa C
ount
y, Co
lo.,
and Gr
and
Coun
ty,
Utah.!—Continued,
Assay data
Hole H
o. and
collar e
lev.
(feet)
Bloc
k J
BV-1
49(7
411)
Bloc
k K
BV-167
(709
8)
Dept
h in
From
562.
2
563.
7
568.3
568.
9
265.8
266,1
266.
426
7.3
267.
626
7.9
268.8
269.
7270.0
270.
6270.8
271.
3
274.
527
5.4
feet To 563.2
565.0
568.
956
9.7
266.
126
6.4
267.3
267.
626
7.9
268.2
269.
7270oO
270.
627
0.8
271.3
271.8
275
<>4276.8
Thickness
(fee
t)
1.0
1.3
0.6
0.8
0.3
0.3
0.9
0.3
0.3
0.3
0.9
0.3
0.6
0.2
0.5
0.5
0.9
1.4
U308
0.020e
0.40
1.52
0.24
0.045
0.006e
0.02
4e0.
015e
0.02
0e0.
004e
0.03
2e0.16
1.03
1.20
17.5
30.4l
0.18
0.050
Percent
Y205
<0.1 3.17
3-70
11.7
5
0.20
0.38
0.56
0.30
0.37
0.30
0.31
2.40
15.2
310
.90
26.46
16.32
l.8l
0.50
CaC0
3
Unde
t
7.50
4.14
6.33
3.21
Undet
1.60
Unde
tUndet
Undet
Undet
0.26
0.11 .
0,07
0.20
0,13
0.20
Oo87
Gamm
a-ra
y data
Per
cent
eU
308
0.03
0 0.
60
1.80
0.03
1
0.05
5
15.0
0.
026
0.33
0.
064
Dep
th i
nFr
om
560.
5 56
2A
566.
8
569.
5
265.
9
270.
0 27
1*3
274.
0 27
5-1
feet To 562.
4 56
3.1
567.
6
570.
6
267.
1
271*
3 27
3*3
275=
1 27
6.3
Thi
ckne
ss
(feet)
1.9
0.7
0.8
l.l
1.2
1.3
2
.0
lol
1.2
OFFICIAL U
SE OHLY
OFFI
CIAL
USS OHLY
Tabl
e 4.—
Hole N
o. and
coll
ar e
lev.
(feet)
Block L
BV-208
(7534)
Other Holes
BV-1
6 (7564)
BV-3
9A
(723
9)
(716
9)
BV-5
0 (7
368)
Assa
y da
ta,
Dept
h in
From
597.1
597-5
598.7
187.
7 18
9*5
190.
2
403*2
404
07
405»3
277.6
278.2
278,
5
Ho S
ampleBe
aver
feet To 597^5
598.
4
599 .0
189.5
190.
2 19
0.8
403.
5
405.
3 40
6.5
278.2
278.
5 278.8
56
Mesa
area, Me
sa C
ount
y, Co
lo.,
Assay data
Thickness
(fee
t)
0.4
0.9
0.3
1-7
0,6
0.3
0.6
1.2
Oo6
0.3
0.3
Percent
U3°8
V205
lo99
9»79
0.11
0.
25
0.02
6e <0.1
0.054
<o.i
0.60
<0.1
0.05
7 <0ol
0.0l
4e
1.72
0.045
0.15
0.
V079
0.73
0.17
0.20
0.098
0»32
0.055
<0.1
and
Gra;
Ca€0
3
0.6
19-7 Undet
5.1
11.1
10.7 0.7
2oO
2.1
3.6
0.7
602
Percent
Dept
h in
fee
t Fr
om
To
Sot Pr
obed
0.02
3
Oo02
0
2.3
15.9
fc3-
6
46. l
i-
187^9
0.05
6
0,03
5
0.16
16.8
45.1
48.5 1880
8
405 ol
480.
1 481o3
519=0
519-
7
0.9
1-5
2.1 0.9
0.9
1.1
1.0
1.2
OFF
ICIA
L U
SE
OH
LI
OFF
ICIA
L U
SE
Ol&
t
Tabl
e 4.— Assay
data,
Beaver
Hole
Ho.
and
coll
ar e
lev.
(fee
t)
Other
Holes-
BV-51
(723
6)
BV-5
3(7229)
BV-5
5(7406)
Dept
hFrom
-Con
tinu
ed 405.8
406.
140
6.4
406.
7
408.
2
416.4
4l6.7
417.
5
419.8
420.2
420.5
421.
4
566.0
in fee
tTo 406.
1' 4
o6.4
406.7
407.0
408.8
416.7
417.2
417.7
420.
242
0.5
420.
8
421.7
566.3
37
Mesa a
rea, Mesa C
ount
y, Colo.,
Assay da
ta
Thic
knes
s(f
eet)
0.3
0.3
0.3
0.3
0.6
0.3
0.5
0.2
0.4
0.3
0.3
0.3
0.3
Perc
ent
U308
V2©5
0.03
3e
0.15
0.62
0.
170.
053
<0.1
0.18
<0ol
0.03
2e <0
.1
0.03
1 0.
150.
19
0.48
0.01
5e
0.62
0,03
8 <o.i
0.07
1 1.
320.
034e
0.
37
0.057
0.59
0.02
4 <0
.1
and Gr
and
Coti
nty,
Utah*— Cont
inue
d 0
Gamma -
ray da
ta
CaC03
Undet
3<7
9-0
11.8 Undet
1.0
9*2
8.1
7»5
2.8
Undet
6.5
0.3
Percent
Dept
h in feet
Thic
knes
seU30Q
From
To
(fee
t)
0.13
404.4
405.4
1.0
0.21
405.
4 407.4
2.0
0.02
1 407.8
409.6
1.8
0.21
4l5o3
4l6.2
0.9
0.03
5 4l8.8
420*
7 1*
9
0.020
559.6
560.6
1.0
0.030
567.2
568.2
I,©
OFF
ICIA
L U
SE O
HLY
OFFI
CIAL
USE
QHLY
Table 4.
—
Sole
No. and
coll
ar e
lev.
(feet)
-Assay d
ata,
Dept
h in
From
Beav
er
feet To
Mesa a
rea, Mesa County
Assa
y da
ta
Thic
knes
s (feet)
, Colo.,
and
Gr«
Perc
ent
U308
V2°5
CaC0
3
Other Ho
les — Co
ntin
ued
BV-5
8 (7215)
BV-61
(747
4)
404.
9
410.
4 410.7
410.8
412.0
414.
1
415.3
415.6
425.
5
662.
9 663.2
*663
.2
405.0
410.7
4lOo
8 411.4
412
o 3
4l4o7
415.6
4l6
05
426.
1
663,2
663=6
663.6
0.1
0.3
0.1
0.6
0.3
0.6
0^9
0.6
0°4
0,4
0.06
8
0.40
0.04
0e <
0.038
0.02
2e
0.36
0.03
4e
<
0.04
3 <
0.04
3 <
1.24
1.27
3*07
0.37
:o.l
0.22
0.17
Od2
:o.i
:o.i
:o.i
0.17
0.17
0.9
1.0
1.8
Unde
t
2.2
Undet
1-3
Undet
19 .4
0^8
Unde
t
Percent
0,54
Oo
021
Ool7
0.025
0.028
0,020
Oo048
0=98
Gamma-ray da
ta
Dept
h in feet
From
To
409
0140
9 .8
418.6
421*7
412.3
4l4
05
419.7
424.3
Thic
knes
s (feet)
0.7
2o5
0.8
1.1
206
447,
5 44
805
1.0
449.2
450.3
Id
662.0
662.6
0.6
OFFI
CIAL
USE OHLT
n k
Hf
I P
T&
T
TTCJ
T?
UrJ
? X
U-L
FL
Li
UD
£i
fable
4. —
Ass
ay d
Lata
^ le
aves
Hol
e H
o.
and
coll
ar
elev
. D
epth
in
-fe
et
fl(f
eet)
Fr
omTo
39
* B
fesa
are
a^
Mes
a G
owrt
y C
olo.
P an
d G
rar
Ass
ay d
ata
lick
nes
s (f
eet)
U3©8
Per
cent
¥205
CaC
03
Oth
er h
ole
s
BV~6
4 H
o sa
mpl
e (7
500)
BY
-68
Ho
sam
ple
(747
1)
B?~
71
609
.3/*
7C
AA
\(7
500)
60
9.9
6l4.
2 61
4.4
614.
6
615.
1
632.
3 63
3-4
B?-
73
493.
9
496.
3 49
6*9
609.
6
610.
5
614.
4 61
4.6
614.
7
616,
0
633-
4 63
3-6
494.
3
K:?
0.3
0.6
0.2
0
.2
0.1
0
.4
0.9
1.1
0*
2
0.4
0*6
0,2
0.02
5e
0.06
7
2.65
0.
092
0.18
0.
11
0.0l
4e
0.0
46
0.03
1©
1.2
0
0.1
20.
066
0.20
0.31
9.86
0-
59
0.38
0.
17
0.13
0*43
4.54
0.1
1
Itod
et
2.0
0.4
0.4
2.3
7-
3 tt
adet
2.7
t&
det
4.6
5*7
6.5
id C
ottn
ty*
Uta
h . —
Con
tinu
ed .
Gam
ma-
ray
dat
a
Per
cent
Dep
th i
n f
eet
Thi
ckne
seU
308
From
To
(f
eet)
0.02
2 61
5.6
616.
6 1.
0
0.03
8 62
7.0
627-
9 0.
9
0.04
6 55
2o8
554.
1 1,
3
0.02
2 55
5-5
557-
0 1.
5
0.03
7 60
9.6
611.
2 1.
6
1.8
61
4.6
615.
2 0.
6
0.09
0 63
3.1
633.
8 0.
7
0.2
5
633.8
634.5
0.7
Not
Pro
bed
OFFI
CIAL
U33
OFFI
CIAL
USE
Tab
le
Hol
e N
o.
and
co
llar
elev
. (f
eet)
k. —
Ass
ay d
ata,
B
eave
r M
ssa
area
,
Ass
ay d
ata
Dep
th i
nFr
omfe
et
To
Thi
ckne
ss
(feet)
hoM
ssa
Cou
nty
Col
o.
U308
Per
cent
V205
,, an
d
CaC(
>3
Oth
er h
ole
s. —
Con
tinu
ed
BV
-75
(711
*0
W-7
6 (7
231)
BV
-77
W~7
8 (7
508)
Ho
sam
ple
3^5-
3
523-
7 5^-3
515.
6 51
6-3
517-
5 51
8 .k
518*
7
530.
1
537-
5
366.
5
52^.
3 52
5.0
516.
3 51
6.6
518.
7 51
9.3
530.
5
537-
9
1.2 0.6
0.7
0.7
0-3
0.9
0.6
OA
Q.k
0.0
29
0.0
25
e 0
.2^
0,0
26
0
.06
2
0.0
29e
Q.k
Q
0.0
65
3.0
2
O.k
k
0.26
l!51
0.28
<JQ
^3.
*^0»
1 0
.26
13
.97
1.1
2
0.3
Und
et
k.k
0.5
ttod
et3«
3 1-
9
0.2 1.6
Percent
0.02^
0.030
0.12
0.027
0.35
0.0%0
0.12
Gemma-ray data
Dept
h in feet
From
To
215.
3
223-9
366.7
368.9
358.
3
516.
0
517-8
518.8
216.6
22^.9
367.7
369-
5
52^.7
525.
^
3^9.
0 35
0.3
359-
5
517.1
518.8
519.7
531.
1
538.8
1-3
1.0
1.0
0.6
0.7
1-3
1.2
1.1
1.0
0.9
OFFI
CIAL
USE OHLI
OFFI
CIAL
USE OHET
41
Table
4. — Assa
y da
ta,
Beav
er Mss
a ar
ea B
fesa C
ount
y Colo.
Assay data
, and Grand
Coun
ty, Utah.—
Cont
inue
d.
Gamma-ray da
taHo
le H
o. a
ndeoUar ele
v (feet)
Other ho
les*
BV-8
1 (7452)
BV-9
1 (7
581)
BV-94
(7196)
W-95
(7205)
BV-9
7 (7
400)
BV-9
8 {7
379)
Dept
hFrom
—Continued.
599-0
599-6
607.3
(Ass
ay
Ho s
am£
345-1
*345-l
^386.1
388.5
389.4
390.
0
489.0
489,3
••
383.8
in fee
tTo 59
9-3
599-
9
Thickness
(feet)
0.3
0.3
607.
8 0.5
data by pr
ivate
company
345-4
386.
7
389.
1
389.7
390.
3
489.3
384.8
0.3
0.3
0.6
0.6
0.3
0.3
0.3
0.2
1.0
U3©8
0.026e
0.0226
0.02
.
From
0.23
0.26
0.0l8e
0.026e
0.026e
0.0l6e
0.04
2 0.0l4e
0.023e
Percent
V205
^0.1
^0.1 1.60
inte
rval
b
0.04
0.25
0.11
< 0.1 0.10
2.05
0.35
0.15
CaC0
3
Uhdet
Uhdet
Uhde
t ie
lov bottom of
0.8
Uhdet
Uhde
t
Unde
t
Uhde
t
Unde
t
1.9
Uhde
t
Undet
Percent
0.034
Depth
inFrom
594-
7
feet fo
596.3
Thic
knes
(f
eet)
1.6
Hot
Prob
ed
0. S.
Geol» Survey hole.)
0.05
0
0.05
4
0.054
0.05
4
O.03
0
0.03
5
0.03
4
O,o4o
325-
3
366.
4
347-
3
390.
0
392.
0
467-2
488.
7
384.7
326.
4
337-
3
348.1
390.
9
393.
0
410.4
468.0
489.6
386.1
1.1
0.9
0,8
0.9
1.0
0,7
0.8
0.9
1.4
OFF
ICIA
L U
T3 O
IF-T
OFFI
CIAL
USE
42
Tab
le 4
.— A
ssay
dat
a,
Bea
ver
Bfe
sa a
rea
Mes
a C
ount
y C
olo.
, an
d G
rand
Cou
nty5
Uta
h.—
Con
tinu
ed.
Ass
ay d
ata
j_
Gam
ma-
ray
dat
aH
ole
Ho.
an
d co
llar
elev
. (f
eet)
Oth
er h
ole
s. -
BV
-99
(737
3)
B?~
102
(750
1)., (7
499)
BV
-109
(7
482)
Dep
th i
n f
eet
T,Fr
om
-Con
tinu
ed
443.
9 44
4.4
452.
0 45
2,3
455.
9 45
6.8
Ho
sam
ple
518,
4
635*
8
637.
5
642.
0
Tb 444
4h
hh
Q
45
2.3
45
3-2
456.
8 45
7-4
518.
7
636.
6
638.
1
642.
3
hick
ness
(f
eet)
0.5
0.5
0.3
0.9
0.9
0.6
0*3
0.8
0.6
0.3
U3©8
0.05
2
0.01
8 0.
026e
0.19
0.0
l2e
0.28
0.02
1e
0.0
l6e
Per
cent
V20
5 C
aC03
0.27
8*
5 2.
82
2.8
3*25
2.2
0.
10
0.15
6.0
1A7
OA
2.42
0.6
0.13
tt
adet
0.16
U
ndet
Per
cent
0.35
0.17
0.04
9
0.8
6
0.02
1
0.07
8
0.0
24
0.04
8
Hot
pro
bed
0.02
8
0.02
2
Dep
th i
n f
eet
From
444.
6
457*
2
460,
2
344.
6
345.
7
514.
1
626.
8
633.
1
638.
6
Uo
453.
0
453.
7
457-
8
461.
0
345.
2
346.
3
514.
5
627.
7
633
•&
640.
0
Thi
ckne
s (f
eet)
0.7
0.7
0.7
0.6
0,8
0*6
0.6
0.4
0.9
0.7
1.4
OFF
ICIA
L T
JS&
OHLY
Tab
le
Hol
e H
o. a
nd
coll
ar e
lev.
(fee
t)
4.-
- =A
ssay
dat
a^
Bea
ver
Mes
a ar
ea
Ass
ay d
ata
jpMs^f
i-. jfiiH
1' f e^
et-
From
To
Thi
ckne
ss
(fee
t)
*3
Mes
a Co
unl^
y C
olo,
Per
cent
U3°8
^2
<^
; an
d C
CaC
03
CH
&er
-Jjo
les .
—C
onti
nued
*8SS S3 M BV
-12©
(7
*37)
630.
9 63
1.8
583.
7 58
4«3
505.
7 50
6.3
506.
3 50
6.7
506.
7 50
7.7
507.
7 50
8.3
508.
3 50
8.8
Ho s
anrp
le
0.9 0.6
0.6
0.4
1.
0 0
.6
0.5
0.04
2 0
.11
0.06
1 0.
45
0.40
1.
54
0.03
1e
<0.
1 0.
028e
<
0,1
0.02
7e
<0.
1 0.
92
3*22
n.i
5.1
Uid
et
Itod
et
ttod
et
1-5
Percent
6^308
0.025
0.20
0.10
0.021
0.18
0-33
0.052
0.90
O.C&O
Gamma~ray data_______
Dept
h in fee
t Tn
ickn
es
From
To
(fee
t)
617.
0
624.0
628.3
578.0
580.1
593.5
505.5
506.
3"
508,
1
617.
7
625.
1
629.
0
578.
8
581.
1
59^-
3
506.
3
508.
1
508,
8
0.8
1.8
0.7
OFF
ICIA
L U
SE O
BIS
OFFI
CIAL
USE
Table
i
Hole H
o. and
coll
ar e
lev.
(fee
t)
!• . —As
say
data
, Be
aver
tfesa area
Assay da
ta
Dept
h in
feet
Fronr
ToTh
ickn
ess
(feet)
Mesa
Cou
nty
Colo
.^
Perc
ent
U308
Vg05
and
G
CaC0
3
Other holes.— Continued
BV-122
BV-123
(7371)
BV-1
25
{745
2)
W-131
(7057)
Ho s
ampl
e
455
«r6
455»9
1*57
*1
457-4
612.
0 61
2.3
639.9
640.2
196.8
197.1
257*3
257-
6
0.3
0.3
0.3
0.3
0.3
0.3
0*3
O.Ol
Se
<0.1
0.02le
<0.1
O.Q2
4e
<©.!
0.06
8 0.
17
0«(A
6 1-52
0.0^
6 0.39
0.10
<0.1
Uhdet
Undet
ttod
et
7.80 ,* 13.02
Gamma-ray da
ta
Dept
h in
feet
From
ToPe
rcen
t eU
308
0.02
0 1*10.3
to.2
0.025
^16-3
^18.3
0.1*2
1*61
.3
^61.
8
Hot probed
0.9
2.0
0.02
5
610.
4 6
U.4
1.0
637.
4 63
8.3
0.9
196.
8 19
7.9
1-1
256.
6 25
8.2
1.6
OFFICIAL
OFFI
CIAL
USE
Table
J
Hole N
o. a
nd
coll
ar e
lev.
(fee
t)
k,- -
Assa
y data^, Be
av
Dept
hFrom
in: f
eet
To
•er ifesa ar
ea
Assay data
Thickness
(feet)
Mesa
County
Colo
.^
Perc
ent
-.U3
08
¥205
, and
C
CaC0
3
Other ho
les
. -"C
onti
nued
BV-1
32
(7480)
37-133
(720
5)
660.
661.
661.
662.
664.
664.
665
o9 66
1.2
2 661.5
5 66
2.4
4 66
2.7
3 664.6
9 66
5.2
2 665 .4
406 c0
407,
2 40
7.2
408.
1 40
8,1
408.4
408.4
409.0
409*0
409o
3 409*3
409.6
0-3
0.3
0.3
0.3
0.3
0.2
1.2
0,3
0.6
0.3
0.3
0.02
0e
<0.1
0.18
<0.1
0.030
<o.i
0.35
<o.i
0.02
7e
<0.1
0.10
<0
.1
0.00
6e
0.15
0.02
0e
<0.1
O.
OSde
0.
270.23
0.27
0
e090
<0
«10.
068
<o.l
Itod
et
5-43
3-45
Unde
t
13-65
Undet
Unde
i Unde-
Unde-
4.62
6.45
6.18
Utah
. - -
Con
tinu
ed,
Perc
ent
0.03
2
0.023
0.03
2
0.022
OclO
0.056
0.18
©.©90
0.13
«-ra
y da
ta
Depth
In feet
To
469*
4 472.8
3-4
472.
8 47
4,7
1.9
536.0
537.2
1.2
654.
2
661.
8
662.
4
663-
1
665.
2
406.
4
655.
0
662.
4
663.
1
663.
9
666.3
4©7.4
0.8
0.6
0.7
0.8
1.1
1.0
OFFI
CIAL
USE OHL
Y46
Table
4. — As
say
data
, Be
aver
Mss
a area B
fcsa
County
Colo
,
Assay data
Hole H
o. a
nd
coll
ar e
lev.
(feet)
Othe
r ho
les.
BV-134
(7279)
BV-137
(744
9)
Depth
inFront
—Continued 34
3.6
345.8
385.
5
386.6
387.8
476.1
476.5
feet To 34
3.9
346.1
385.7
387.2
388.7
Zl
Thic
knes
s (feet>
0.3
0.3
0.2
0.6
0.9
0.4
0.3
0308
0.055
0.07
6
0.02
7e
0.05
8
0.10
0.10
0.04
9
Perc
ent
V205 0.12
1-37
<0.1 0.27
3*43
0.25
,, an
d (
CaC0
3
8.91
19.7
4
3.42
4.86
5.10
1.15
10c05
Percent
0.02
8
0.03
4
0.03
3
0,69
8
0.06
8
©.<
Gam
ma-
ray
dat
a
Depth
in fee
t From
To
344.
2 34
5.6
1.4
346.
7 34
7.5
0.8
386.
9 38
9.4
2.5
389.
4 39
0.4
i.o
475-
2 47
6.2
476.
2 47
7.3
1.1
OFF
ICIA
L U
SE O
HU
OFFI
CIAL
USE O
HIff
47T
able
4. —
Ass
ay d
ata,
B
eave
r M
ssa
area
Mes
a C
ount
y C
olo.
Ass
ay d
ata
Hol
e H
o.
and.
co
llar
elev
- D
epth
in
(feet)
F5
rbm
^V
l^V
.^h
.-ru
n
I* i
n."
^
A.
M
("H
.. .-
4.
,,f ..... _
Ji
utaf
ir n
oxes
.- -C
ontin
ued.
B\T-
139
31T
.5
(721
2)
317.
8
321.
5
323-
2 32
3.5
361.
0
381.
5
382.
2
383.
1
383.
438
3.7
384,
6
407-
0
BV-l4
©
362.
1 H
(717
8)
: 37
4.3
374.
4
feet
To 317.
8 31
8.1
321.
8
323-
5 32
3-9
361.
6
381.
9
3^5
383.
4
383.
7 38
4.6
385-
4
407.
4
374.
4
374.
7
Thi
ckne
ss
(feet)
0.3
0.3 0.3
0.3
0.4
0.6
0-.4
0.3
0.3
0.3
: lil ©
.4
0.1
« ©.3
Per
cent
V30
8 V
205
-
0.0
32e
<0
.1
0.04
5 0
.19
0.05
4 <o
a
0.35
<0
.l 0.
051
<o.i
0.03
0e
<0.1
0.13
<
0.1
0.03
4e
<0.
1
0.06
8 <
0.1
0.19
0.
14
0.07
3 0.6
l 0.
0l2e
0.
5^1
,
oll
O
O.<
?0
0.0
2le
<
0.1
0.07
1 <
©.i
0*©
S^l
0.1
1
,} an
d G
rand -
CaC©
3
Ifed
efr
9-45
5-43
6.18
6.7
8
Und
et
0,59
Und
et
2.92
2.12
1.
64
2.26
tfad
et
0.35
Cou
nty,
tf
tah.
— C
onti
nued
.
Gam
ma-
ray
dat
a
Per
cent
0.05
3
0.14
0.05
8
0.17
0.02
3
o.n
o.©
86
©.©
32
©.©
33
©.©
59
Dep
thFr
om
318.
7
324.
3
361.
7
381.
5
382.
3
383.
5
406.
7
1
369-
5
373*
^
in f
eet
To
319.
5
325.
0
362.
4
382.
3
383.
5
384.
5
407-
5
362.
6
37©
. 4
373-
7
Thi
ckne
s
0.8
0.7
0.7
0.8
1.2
1.0 0.8 if
1.2
0.9
0.7
OFFICIAL
OFF
ICIA
L U
SE O
ll£g
Tab
le
Hol
e H
o. a
ndco
llar
elev
. (f
eet)
Oth
er h
oles
.—BV
-1%
1 (7
**)
(716
7)
cK§
%. —
Ass
ay d
ata,
B
eave
r M
ssa
area
Ass
ay d
ata
Bej
>tit
in f
eet"
From
T
o^C
onti
nued
Mo
sam
ple
357-
3 358.8
358.
8 35
9.0
359.
0 35
9-3
360.
2 36
0.5
360.
5 36
0.8
360o
8 36
1.1
361.
1 36
1.3
36%
. 1
36%
.%
365*
0 36
5*9
366.
5 36
7-7
371.
2 37
1.5
613
*7
613.
9 61
3.9
6l%
*2
Thic
knes
s (f
eet)
1-5
0.2
0.3 0.3
0.3
0.3
0,2
0.3
0.9
1.2
0.3
0.2
0
.3
tfes
a C
ount
y C
olo.
Per
cen
tU
308
V2©
5
0.05
1 <o
.i
0.7
3
0.35
0.
02%
e <
0.1
0.02
8e
<0
.1
0.%
6 <
©.!
0
.06
6
O.I
0.2
0
<0
.1
0.02
5e
<©
.!
Q0Q
31e
<0
.1
0.0
27e
<0
.1
0<.0
67
<©«.
!
Oo0
6%
<©
.l
Oo^le
<
0.1
s an
d C
Ca0
03
%.8
3
3.%
5 tt
odet
5»55
3-
33
3.75
Und
et
Ifad
et
tfia
det
15.6
0
5.88
U
ndet
BV-1%7
Ho s
ample
Cou
nty^ Perc
ent
0.21
0.03
5
0.2^
0.038
®.%7
0.05
6
t.55
0.02?
0.028
0.02
%
0.09%
Continued
<
Gemma-ray data
|i "
" • •»
' '
"" "
' '"""HI
I' I
Mill
-"!'
I
Dept
h in fee
t Thicknes
To
(fee
t)
567^
7 568.3
0.6
357*
8 358.7
0.9
358.
7 359*1
1-*
359-
1 35
9»7
0.6
360
80
360.
2 0.2
360.
7 36
1.5
0<8
36^.
7 36
5.7
1-0
370«
2 371ol
589.6
590.6
612.%
1.0
1.0 0,5
USE
OFF
ICIA
L U
SE
Tab
le k
, °-A
ssay
da
Hol
e N
o.
and
co
llar
elev
. If
eptn
in
(feet)
Fr
om
Otf
eer
hole
s,- -
Con
tinu
ed
BY
-151
51
7^2
(7%
03)
569.
1 57
0.6
572.
4
BV
-152
Ho
san
g(7
352)
551-
2 (7
379)
\
t *
J I
of /
556.
2 55
6.%
556.
7 55
6.6
ta,
Bea
ver
Mes
a ar
ea J
fesa
Cou
nty
Col
oejt
an
d G
mnd
Ass
ay d
ata.
feet
To 517.
5
570.
657
1.8
573.
0
Oe 55
2.1
556 .
k55
6.7
556.
855
7.1
Thi
ckne
ss
(feet)
0.3
1.5
1.2
0.6
0.9
§.2
0.3
0.1
0
.3
U30
8
0.05
5
0.06
1 0.
072
0.03
0
0.03
7
1.1*5
0.
592
.25
0.2
3
Per
cent
¥305
C
aC03
0.1
9
10
.02
0.19
5.
1©
<0,1
6.
33
0.51
3.
09
0.31
3.
87
k.^k
0.^
9
0<>7
2 2.
0%6.
61
1.35
6.
1%
1.15
L C
ount
y,
Uta
h.-
Per
cent
0.02
8
0.13
0.03
8
0.31
0.09
2
0.03
5
0.07
6
0.92
0.09
%
» -C
onti
nued
.
Gam
ma -
ray
dat
a
Dep
thFr
om
515.
7
568.
2
569.
1
570.
3
571.
6
518.
5
550.
3
555.
5
560*
3
in f
eet
To
5l6»
8
568.
9
569.
6
571.
1
572.
2
519-
5
551-
1
556.
3
561.
0
Thi
ckne
s (f
eet)
1.1 0.7
0,8
0.6
1.0 0.8
0.8 0.7
OFF
ICIA
L U
SE O
HL!
OFF
ICIA
L U
SE
Tab
le
Hol
e B
o.
and
co
llar
elev
* (f
eet)
Oth
er"
hole
s . -
B7-
156
(7M
6)
<SS5
AW
-158
(7
185)
W-1
59
(716
2)
BV
-160
(7
167)
4 o—
Ass
ay d
ata^
B
eave
r M
esa
area
Ass
ay d
ata
Dep
th i
n f
eet
From
To
-Con
tinu
ed
561.
V
562.
3
515.
5 51
6.1
526.
2 52
6.5
603.
3 60
4.5
60^.
5 60
5.9
607.
1 60
7.5
607
°5
607.
8
609.
3 60
9.9
3f6.
8 37
7.0
3/7*
0 37
7 '7
37
7.7
377.
8
3^*8
.5
3^-8
3^
8.8
3^-9
A
3%o%
35
0 06
Ho
sam
ple
Thi
ckne
ss
(feet)
0.9
0.6
0.3
1.2
0°.3
0.6
0.2
0.7
0.1 0.3
0.6
1.2
'
50
Mes
a C
ount
y C
olo*
U3©
8
0.0
29
e
0.0
29
e
0.0
21
e
0.0
32
e 0
.07
1
0.0
68
0.0
l6e
0.1
1
0.0
32
e
l:T
0.02
9®
Per
cent
V2Q
5
0.16
0.16
0.30
0.37
0.
32
0,12
0.
18
^0*1
^O
fl 2.39
^:i
<©
.!
9 an
d G
rand
Cou
nty^
U
fcah
o= -C
onti
nued
.
Gam
ma-
ray
dat
a
Per
cen
t D
epth
in f
eet
Thi
ckne
sC
aC03
6^
303
From
T
o (f
eet)
Und
et
Und
et
Hot
pro
bed
Und
et
Und
et
6.18
6.69
U
ndet
0,9
3
0.0^
8 61
0.1
610.
7 0.6
Und
et
0.21
37
7-2
377»
9 0.
7 2.
76
0.18
ttade
t 0.
57
35©
«T
351«
k 0.
7
Itode
t
0.03
3 27
7*9
278.
5 0,
6
OFFICIAL USE
51
Tab
le 4
. —A
ssay
dat
a^
Bea
ver
Mss
a ar
e'a^
If
esa
Cou
nty
Col
o.^
and
Gm
n
Ass
ay d
ata
Hol
e H
o.
and
coll
ar
elev
. D
epth
in f
eet
Thi
alm
ess
Per
cent
(feet)
Fr
om-
To 7
(feet)
03
08
¥205
C
aCO
j
Otlj
er^
hole
s « «
»Con
tlnu
ed
W-1
61
483,
8 48
5.3
1.5
0.05
0 0.
32
1.53
(7
384)
532.
6 53
2.9
0.3
0.03
0e
2.03
1.
59
W-1
63A
52
7»6
527.
9 0.
3 0.
024©
0,
16
ttode
t (7
258)
54
1.8
542*
7 0.
9 0.
020e
<
0.1
TJnd
et
577-
6 57
7.8
0.2
0.07
0 0.
12
1*60
B?°
l64
306o
j 30
7.0
0.3
0.05
2 O
.U
401
7 (7
168)
W°l
65
537
•?
538.
3 0.
6 0,
027©
<
0.1
Itad
et
538.
6 54
© 04
1.
8 O
c026
e <
0.1
ttode
t
544.
4 54
5.3
0.9
0.04
6 0.
14
0*11
d C
ount
y^
Uta
lio-
«Con
tim
ied
9
Gam
ma-
ray
dat
a
Per
cen
t
0.03
1
0.07
2
0.03
2
0.02
5
0.02
0
0.03
0
0.02
6
0.02
8
0.07
8
0.03
5
Dei
ptfc
From
479.
9
482.
6
532.
7
535.
1
541.
6
577*
8
305
c9
310
o5
545-
7
554.
3
in f
eet
To W©
.7
483.
4
533-
5
536.
5
542.
4
578.
4
306.
9
311.
8
546.
4
555-
0
Thi
ckne
s (f
eet)
0.8
0.8
0.8
1.4
0.8
0.6
1,0 1.3
0.7
0.7
OETI
CIAL
USE
OFF
ICIA
L U
SE O
HL3T
!Eab
le
Hol
e H
o.
and
co
llar
elev
. (f
eet)
Oth
er h
ole
s.*
BV
-166
(7
199)
(7*8
6)
BV
-180
A
(725
6)
(721
5)
(716
9)
•
IK—
Ass
ay d
a52
ta
, B
eave
r M
esa
area
, M
esa
Cou
nty
Col
o.,
and
Ass
ay d
ata
Dep
th i
n f
eet
ThFr
om-
-Con
tinu
ed
396.
5 39
6.8
397.
1
656.
7
386.
U
391-
1
353-
1 35
3.7
353.
9 35
*-3
35*-
7
282.
3
283.
5
290.
9 29
2.7
293.
0
299-
7
To
396.
8 39
7.1
397.
*
657.
0
386.
9
392.
6
353-
7 35
3-9
35*-
3 35
*. 7
355.
6
283.
2
38*
•*
292.
7 29
3.0
293.
9
300.
9
tick
ness
(f
eet)
0.3
0.3
0.3
0.3 0.5
1.5
0.6
0.2
0.^
0.*
0
.9
0.9
0.9 1.8
0.3
0.9
1.2
Per
cent
U308
0.22
0.
17
0.02
5e
0.03
2e
0.08
9
0.0^
7
0.0
l6e
0.02
7e
0.12
0.3
1
0.02
6e
0.0
l9e
0.08
3 0.
18
0.0*
7
0.03
3ena
nfifn
-r it
T
TWIT
S tV
gC^
*.26
0.2
8
0.7
1
0.1 0.
16
O.*
0 0
.^2
0
.89
0.1
4
0.1
2
0.1
9
^0.1
^0
.1
^0
.1 0.19
CaC
03
0.57
1.
602.
0^-
Ifad
et
13 »
7
15.0
Uod
et
ttod
et
3<>3
2
.9
ISid
et
2.3
5
.*
1.9
ttod
et
Percent
0.29
0.036
0.02*
0.032
0.66
0.023
0.025
0.05
3
Gamma-ray da
ta
in fee
t To
From
397.
* 39
8.2
0.8
656.
9 65
7.6
0.7
385.
0
386.
8
390.
6
353-
*
358.
0
385.
8
387.
8
391.
*
35*.
2
359.
1
289.
2 29
1.7
299.
6 30
0.6
0.8
1.0
0.8
0.8
1.1
2.5
1.0
OFF
ICIA
L U
SE O
HU
3&bX
& 4
. — A
ssay
da
Hol
e H
o.
and
co
llar
elev
. D
epth
in
(feet)
Fr
om
Bf-
191
182.
6 (7
073)
18
3.6
183.
8
186.
7
191.
3
53
ts,
Bea
ver
Mes
s, ar
ea,
Ifes
a Co
Ass
ay d
ata
feet
ElT
o 162.
7
18
3.8
18
%. 0
If
lfc.
l
186,
8
192.
2
lick
nes
s (f
eet)
0.1
0.2
0
.2
0.1
0.1
0.9
U308
0.35
0.06
5 0.
33
0.06
5
0.35
0.06
5
*ant
y C
olo<
,#
and
Gra
nd C
oTrn
ty,
tft&
l
Per
cent
V205
2.6
0
0,1
9
1.9
6
0.5
^
^.0
9
0.^
0
CaC
03
0.3
0.3
1-3
1,9
BV
-192
MO
sam
ple
(751
6)
W-1
95
533-
3 (7
^97)
53
3-5
536.
0
537-
5 53
&.7
533
»5
53^.
0
537-
2
53B.
.753
9-6
0.2
0.
5
1.2
1.2
0.9
0.00
5e
O.Q
C&e
0.02
©e
0.0
26e
0.1
5
0.1
3
0.1
1
0.2
5
Und
et
Itod
et
Und
et
Und
et
7.1
Per
cent
0^02
7
0.08
^
0.30
0.06
0
0.5**
-
0.1
2
0.0
36
0.0
36
0.03
5 0.0
20
0.0
56
i . —
Con
tinu
ed .
Gam
ma-
ray
dat
a
Dep
th i
n f
eet
Ftom
162.
7
181.9
183.
2
18%
A
186
.k
191-
3
192.
1
525.
8
53*
.1-
535-
0 53
6.6
To 163-
7
182.
5
183.
8
18^,
8
187,
1
192.
1
192.
7
526A
535-
0 53
6.6
538.
1
Thi
ckne
s (f
eet)
1.0
0.6
0.6
OA
0.7
0.8
0.6
0.6
0.9
1.6
1-5
BV-3
0557
557
6-7
0.9
O.X
3o
.n57
3-9
57^-
6 0.
7
OFF
ICIA
L U
SB
OFFI
CIAL
USE Q
UEST
Table 4.—Assay dat
a, Beaver Mss
a ar
ea,
Mssa C
ount
y Colo., and Grand
County,
tlbafe.—Continued.
Assa
y da
taGamma-ray data
Hol
e H
o. a
nd
coll
ar e
lev.
Dep
th,
in f
eet
Thi
ckne
ss
Per
cent
(fee
t)
from
To
(f
eet;
11
303
V2<>
5 Ca
C<>3
/\Jta1n «
Bin
H
*w «
• T
m
m
MI
/""I
• •.*
.!•
ft
- -
- •-
- Jt
Oth
er l
aale
s. --
Con
tinu
ed
B7-
206
441.
9 ^2
*5
0.6
0.02
26
0.13
It
odet
(7
^-2)
^8
2,5
^3-1
0.
6 o
.il
0.11
0.
9
W-2
07
526.
0 52
6.9
0.9
0.07
7 0.
11
9*3
(7^2
6)
B¥-2
n 57
1.9
5-^.
2 0.
3 0.0
63
1.31
o0
5(7
^55)
Per
cent
eU
308
0.03
5
O.C
^9
0,07
6
0.03
8
Hot
pro
bed
0.12
0.
27
0.02
2 0.
26
0.©
95
0.06
6
0.03
0
0.06
3
Dep
thFr
om
ta7*
6
kkO
.2
47&
.1
^95-
6
385.
0 38
5.6
386.
839
3-^
39^«
9
396.
3
^00.
7
570.
0
in f
eet
fo 438.
6
- W
nA
479-
1 .
496.
1
385.
6 38
6.8
393-
4 39
4.3
395-
7
397-
6
401.
3
570.
4
Thi
ckne
s (f
eet)
1,0
1.2
1.0
0.5
0.6
1.2
6.6
0.9
0.8
1.3
0.6
0.4