P-06-83

Forsmark site investigation

Geological single-hole interpretation of KFM06C

Seje Carlsten, Geosigma AB

Jaana Gustafsson, Malå GeoScience AB

Håkan Mattsson, GeoVista AB

Jesper Petersson, SwedPower AB

Michael Stephens, Geological Survey of Sweden

May 2006

Svensk Kärnbränslehantering ABSwedish Nuclear Fueland Waste Management CoBox 5864SE-102 40 Stockholm Sweden Tel 08-459 84 00 +46 8 459 84 00Fax 08-661 57 19 +46 8 661 57 19

CM

Gru

ppen

AB

, Bro

mm

a, 2

006

ISSN 1651-4416

SKB P-06-83

Forsmark site investigation

Geological single-hole interpretation of KFM06C

Seje Carlsten, Geosigma AB

Jaana Gustafsson, Malå GeoScience AB

Håkan Mattsson, GeoVista AB

Jesper Petersson, SwedPower AB

Michael Stephens, Geological Survey of Sweden

May 2006

Keywords: Forsmark, Geophysics, Geology, Borehole, Bedrock, Fractures, AP-PF 400-05-107.

This report concerns a study which was conducted for SKB. The conclusions and viewpoints presented in the report are those of the authors and do not necessarily coincide with those of the client.

A pdf version of this document can be downloaded from www.skb.se

�

Abstract

This report presents geological single-hole interpretation of the cored borehole KFM06C at Forsmark. The interpretation combines the geological core mapping, interpreted geo-physical logs and borehole radar measurements to identify where rock units and possible deformation zones occur in the boreholes. A brief description of the character of each rock unit and deformation zone is provided.

The geological single-hole interpretation shows that six rock units (RU1–RU6) occur in KFM06C. However, the borehole can be divided into seven separate sections due to the repetition of RU2 (RU2a and RU2b). Medium-grained metagranite-granodiorite (101057) dominates the upper half of the borehole and altered aplitic metagranite (101058) the lower half. Other rock types of volumetric importance include one section with amphibolite (102017) and another with felsic to intermediate metavolcanic rock (10�076) occur in the borehole. Subordinate rock types are pegmatitic granite (101061), fine- to medium-grained metagabbro/metadiorite (1010��), fine- to medium-grained metagranitoid (101051) and calc-silicate rock (108019).

Five possible deformation zones of brittle character have been identified in KFM06C (DZ1–DZ5).

�

Sammanfattning

Denna rapport behandlar geologisk enhålstolkning av kärnborrhål KFM06C i Forsmark. Den geologiska enhålstolkningen syftar till att utifrån den geologiska karteringen, tolkade geofysiska loggar och borrhålsradarmätningar indikera olika litologiska enheters fördelning i borrhålet samt möjliga deformationszoners läge och utbredning. En kort beskrivning av varje bergenhet och deformationszon presenteras.

Denna undersökning visar att det i KFM06C finns sex litologiska enheter (RU1–RU6). Baserat på repetition av enheten RU2 (RU2a och RU2b) kan borrhålet delas in i sju sektioner. Medelkornig metagranit-granodiorit (101057) dominerar den övre delen av borrhålet, medan omvandlad aplitisk metagranit (101058) förekommer i den nedre delen av borrhålet. Andra volymmässigt viktiga bergartstyper inkluderar en sektion med amfibolit (102017) och en annan sektion med en felsisk till intermediär vulkanisk bergart (10�076) finns i borrhålet. I mindre omfattning förekommer även pegmatitisk granit (101061), fin- till medelkornig metagabbro/metadiorit (1010��), fin- till medelkornig metagranitoid (101051) och kalksilikatbergart (108019).

Fem möjliga deformationszoner som är spröda har identifierats i KFM06C (DZ1–DZ5).

5

Contents

1 Introduction 7

2 Objectiveandscope 9

3 Datausedforthegeologicalsingle-holeinterpretation 11

4 Executionofthegeologicalsingle-holeinterpretation 15�.1 General 15�.2 Nonconformities 17

5 Results 195.1 KFM06C 19

6 Comments 2�

References 25

Appendix1 Geological single-hole interpretation of KFM06C 27

7

1 Introduction

Much of the primary geological and geophysical borehole data stored in the SKB database SICADA need to be integrated and synthesized before they can be used for modelling in the �D-CAD Rock Visualization System (RVS). The end result of this procedure is a geological single-hole interpretation, which consists of an integrated series of different logs and accompanying descriptive documents.

This document reports the geological single-hole interpretation of borehole KFM06C at drill site 6 (DS6) in the Forsmark area. The horizontal projections of the boreholes in the candidate area are shown in Figure 1-1. The work was carried out in accordance with activity plan SKB PF �00-05-107. The controlling documents for performing this activity are listed in Table 1-1. Both the activity plan and method description are SKB’s internal controlling documents.

Table1‑1. Controllingdocumentsfortheperformanceoftheactivity.

Activityplan Number Version

AP PF 400-05-107 1.0Methoddescription Number VersionMetodbeskrivning för geologisk enhålstolkning SKB MD 810.003 3.0 (in prep.)

8

Fig

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9

2 Objectiveandscope

A geological single-hole interpretation is carried out in order to identify and to describe briefly the characteristics of major rock units and possible deformation zones within a bore-hole. The work involves an integrated interpretation of data from the geological mapping of the borehole (Boremap), different borehole geophysical logs and borehole radar data. The geological mapping of the cored boreholes involves a documentation of the character of the bedrock in the drill core. This work component is carried out in combination with an inspection of the oriented image of the borehole walls that is obtained with the help of the Borehole Image Processing System (BIPS). The geological mapping of the percussion boreholes focuses more attention on an integrated interpretation of the information from the geophysical logs and the BIPS images. For this reason, the results from the percussion borehole mapping are more uncertain. The interpretations of the borehole geophysical and radar logs are available when the single-hole interpretation is completed. The result from the geological single-hole interpretation is presented in a WellCad plot. A more detailed description of the technique is provided in the method description for geological single-hole interpretation (SKB MD 810.00�, internal document).

11

3 Datausedforthegeologicalsingle‑holeinterpretation

The following data and interpretations have been used for the single-hole interpretation of the borehole KFM06C: • Boremap data (including BIPS and geological mapping data) /1/.• Generalized geophysical logs and their interpretation /2/.• Radar data and their interpretation /�/.

The material used as a basis for the geological single-hole interpretation was a WellCad plot consisting of parameters from the geological mapping in the Boremap system, geophysical logs and borehole radar. An example of a WellCad plot used during geological single-hole interpretation is shown in Figure �-1. The plot consists of ten main columns and several subordinate columns. These include:1: Length along the borehole.2: Rock type. 2.1: Rock type. 2.2: Rock type structure. 2.�: Rock type texture. 2.�: Rock type grain size. 2.5: Structure orientation. 2.6: Rock occurrence (< 1 m). 2.7: Rock alteration. 2.8: Rock alteration intensity.�: Unbroken fractures. �.1: Primary mineral. �.2: Secondary mineral. �.�: Third mineral. �.�: Fourth mineral. �.5: Alteration, dip direction.�: Broken fractures. �.1: Primary mineral. �.2: Secondary mineral. �.�: Third mineral. �.�: Fourth mineral. �.5: Aperture (mm). �.6: Roughness. �.7: Surface. �.8: Alteration, dip direction.

12

5: Crush zones. 5.1: Primary mineral. 5.2: Secondary mineral. 5.�: Third mineral. 5.�: Fourth mineral. 5.5: Roughness. 5.6: Surface. 5.7: Crush alteration, dip direction. 5.8: Piece (mm). 5.9: Sealed network. 5.10: Core loss.6: Fracture frequency. 6.1: Open fractures. 6.2: Sealed fractures.7: Geophysics. 7.1: Magnetic susceptibility. 7.2: Natural gamma radiation. 7.�: Possible alteration. 7.�: Silicate density. 7.5: Estimated fracture frequency.8: Radar. 8.1: Length. 8.2: Angle.9: Reference mark (not used for percussion-drilled boreholes).10: BIPS.

The geophysical logs are described below:

Magnetic susceptibility: The rock has been classified into sections of low, medium, high, and very high magnetic susceptibility. The susceptibility measurement is strongly connected to the magnetite content in the different rock types.

Natural gamma radiation: The rock has been classified into sections of low, medium, and high natural gamma radiation. Low radiation may indicate mafic rock types and high radiation may indicate younger, fine-grained granite or pegmatite. The rocks with high natural gamma radiation have been included in the younger, Group D intrusive suite /�/.

Possible alteration: This parameter has not been used in the geological single-hole interpretation in the Forsmark area.

Silicate density: This parameter indicates the density of the rock after subtraction of the magnetic component in the rock. It provides general information on the mineral composition of the rock types, and serves as a support during classification of rock types.

1�

Estimated fracture frequency: This parameter provides an estimate of the fracture frequency along 5 m sections, calculated from short and long normal resistivity, SPR, P-wave velocity as well as focused resistivity 1�0 and �00. The estimated fracture frequency is based on a statistical connection after a comparison has been made between the geophysical logs and the mapped fracture frequency. The log provides an indication of sections with low and high fracture frequencies.

Close inspection of the borehole radar data was carried out during the interpretation process, especially during the identification of possible deformation zones. The occurrence and orientation of radar anomalies within the possible deformation zones are commented upon in the text that describes these zones.

1�

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Page 1

15

4 Executionofthegeologicalsingle‑holeinterpretation

4.1 GeneralThe geological single-hole interpretation has been carried out by a group of geoscientists consisting of both geologists and geophysicists. Several of these geoscientists previously participated in the development of the source material for the single-hole interpretation. All data to be used (see above) are visualized side by side in a borehole document extracted from the software WellCad. The working procedure is summarized in Figure �-1 and in the text below.

Stage 1 in the working procedure is to study all types of data (rock type, rock alteration, silicate density, natural gamma radiation, etc) related to the character of the rock type and to merge sections of similar rock types, or sections where one rock type is very dominant, into rock units (minimum length of c 5 m). Each rock unit is defined in terms of the borehole length interval and provided with a brief description for inclusion in the WellCad plot. The confidence in the interpretation of a rock unit is made on the following basis: � = high, 2 = medium, 1 = low.

Stage 2 in the working procedure is to identify deformation zones by visual inspection of the results of the geological mapping (fracture frequency, fracture mineral, aperture, alteration, etc) in combination with the geophysical logging and radar data. The section of each identified deformation zone is defined in terms of the borehole length interval and provided with a brief description for inclusion in the WellCad plot. The confidence in the interpretation of a deformation zone is made on the following basis: � = high, 2 = medium and 1 = low.

Figure 4-1.  Schematic chart that shows the procedure for the development of a geological  single-hole interpretation. 

Single-hole interpretation

Boremap dataGeneralized geophysical

logs Radar data

Geophysical data

Petrophysical data

1. Rock units 2. Possible deformation zones

16

Inspection of BIPS images is carried out wherever it is judged necessary during the working procedure. Furthermore, following definition of rock units and deformation zones, with their respective confidence estimates, the drill cores are inspected in order to check the selection of the boundaries between these geological entities. If judged necessary, the location of these boundaries is adjusted.

Deformation zones that are brittle in character have been identified primarily on the basis of the frequency of fractures, according to the concept presented in /5/. Brittle deformation zones defined by an increased fracture frequency of extensional fractures (joints) or shear fractures (faults) are not distinguished. Both the transitional part, with a fracture frequency in the range �–9 fractures/m, and the core part, with a fracture frequency > 9 fractures/m, have been included in each zone (Figure �-2). The frequencies of open and sealed fractures have been assessed in the identification procedure, and the character of the zone has been described accordingly. Partly open fractures are included together with open fractures in the brief description of each zone. The presence of bedrock alteration, the occurrence and, locally, inferred orientation of radar reflectors, the resistivity, SPR, P-wave velocity, caliper and magnetic susceptibility logs have all assisted in the identification of the zones. The anomalies in these parameters that assist with the identification are presented in the short description.

Since the frequency of fractures is of key importance for the definition of the possible deformation zones, a moving average plot for this parameter is shown for the cored borehole KFM06C (Figure �-�). A 5 m window and 1 m steps have been used in the calculation procedure. The moving averages for open fractures alone, the total number of open fractures (open, partly open and crush), the sealed fractures alone, and the total number of sealed fractures (sealed and sealed fracture network) are shown in this diagram.

The occurrence and orientation of radar anomalies within the possible deformation zones are used during the identification of possible deformation zones. An overview of the borehole radar measurement in KFM06C is shown in Figure �-�.

Figure 4-2.  Terminology for brittle deformation zones (after /5/).

17

Figure 4-3. Fracture frequency plot for KFM06C. Moving average with a 5 m window and  1 m steps. 

Figure 4-4.  Overview (20 MHz data) of the borehole radar measurement in KFM06C.

KFM06C

0

5

10

15

20

25

30

0 100 200 300 400 500 600 700 800 900 1000

Boreholelegth(m)

Frac

ture

freq

uenc

y(p

erm

)

Open fracturesOpen fractures, partly open fractures and crushSealed fracturesSealed fractures and sealed fracture network

4.2 NonconformitiesIn some cases alternative orientations for oriented radar reflectors are presented. One of the alternatives is considered to be correct, but due to uncertainty in the interpretation of radar data, a decision concerning which of the alternatives that represent the true orientation cannot be made.

Orientations from directional radar are presented as strike/dip using the right-hand rule.

19

5 Results

The result of the geological single-hole interpretation is presented as print-outs from the software WellCad (Appendix 1 for KFM06C).

5.1 KFM06CThe borehole direction at the start is 026.1/–60.1.

Rockunits

The borehole can be divided into six different rock units, RU1–RU6 that have been recognized with a high degree of confidence. Rock unit RU2 occurs at two separate borehole intervals. These are distinguished using the identification codes RU2a and RU2b.

102.131–411.146 m

RU1: Medium-grained metagranite-granodiorite (101057) with subordinate occurrences of pegmatitic granite (101061), fine- to medium-grained metagabbro/metadiorite (1010��) and amphibolite (102017). In addition, a few occurrences of felsic to intermediate metavolcanic rock (10�076), fine- to medium-grained metagranitoid (101051) and aplitic metagranite (101058). Anomalously high frequency of open and sealed fractures in two intervals (205–2�0 and 28�–�05 m) relative to the bedrock outside possible deformation zones. The lower interval also includes a 10 cm wide crush zone. Anomalously low magnetic susceptibility (5–20×10–5 SI) in the interval 200–270 m, which corresponds to a greyish variety of the medium-grained metagranite-granodiorite (101057). Confidence level = �.

411.146–745.050 m

RU2a: Aplitic metagranite (101058) generally affected by faint to medium albitization, which in part corresponds to decreased natural gamma radiation. Subordinate occurrences of fine- to medium-grained metagranitoid (101051), pegmatitic granite (101061) and amphibolite (102017). In addition, one occurrence of fine- to medium-grained quartz- bearing metadiorite (1010��) and one of felsic to intermediate metavolcanic rock (10�076). Anomalously high frequency of sealed fractures and locally faint to weak oxidation below 560 m relative to the upper part of the borehole outside possible deformation zones. Confidence level = �.

745.050–785.470 m

RU�: Amphibolite (102017) with subordinate occurrences of pegmatitic granite (101061). Confidence level = �.

785.470–796.298 m

RU�: Felsic to intermediate metavolcanic rock (10�076). Confidence level = �.

20

796.298–898.132 m

RU2b: Aplitic metagranite (101058) generally affected by faint to medium albitization, which in part corresponds to decreased natural gamma radiation and slightly increased density. Subordinate occurrences of fine- to medium-grained metagranitoid (101051), pegmatitic granite (101061), medium-grained metagranite-granodiorite (101057) and amphibolite (102017). In addition, a few metre wide interval dominated by calc-silicate rock (108019). Anomalously high frequency of sealed fractures, sealed fracture networks and locally faint to weak oxidation relative to the upper part of the borehole outside possible deformation zones. Confidence level = �.

898.132–951.233 m

RU5: Foliated, fine- to medium-grained metagranite-granodiorite (101057) with subordinate occurrences of pegmatitic granite (101061) and amphibolite (102017). Anomalously high frequency of sealed fractures, sealed fracture networks and faint to weak oxidation rela-tive to the upper part of the borehole outside possible deformation zones. Partly decreased magnetic susceptibility (< 0.001 SI) in the interval c 919–9�0 m. Confidence level = �.

951.233–1,000.430 m

RU6: Aplitic metagranite (101058), generally affected by faint to medium albitization, foliated, fine- to medium-grained metagranite-granodiorite (101057) and pegmatitic granite (101061). Subordinate occurrences of amphibolite (102017). Anomalously high frequency of sealed fractures, sealed fracture networks and faint to weak oxidation relative to the upper part of the borehole outside possible deformation zones. Partly decreased magnetic susceptibility (< 0.001 SI) and natural gamma radiation (< 20 µR/h) in the interval c 97�–98� m. Confidence level = �.

Possibledeformationzones

Five deformation zones of brittle character and with a variable degree of confidence have been recognized in KFM06C:

102–169 m

DZ1: Increased frequency of sealed and open fractures. Sealed fracture networks are concentrated in the upper half, while open fractures with apertures over 10 mm and a 5 cm wide crush zone are concentrated in the lower half. Fracture apertures are typically less than 1 mm. Faint to medium oxidation throughout the entire interval. The open/partly open fractures are predominantly gently dipping. The sealed fractures are both gently and steeply dipping with a variable strike in the steeply dipping fractures. The most frequent fracture filling minerals in the order of decreasing abundance include calcite, chlorite, clay minerals, pyrite, hematite and a few fractures with asphalt. Large number of distinct low resistivity anomalies along the entire deformation zone. There is also a general decrease in the bulk resistivity in combination with low P-wave velocity anomalies in the interval c 1�0–155 m. Twenty non-oriented and five oriented radar reflectors are identified. The oriented radar reflectors occur at 1�8.5 m (180/89), 1�9.8 m (209/17 or 090/68), 1�5.9 m (10�/67), 151.9 m (112/6� or 020/�) and at 152.6 m (18�/82). Decreased radar amplitude at 105 m, 115–120 m, 125–1�0 m, 1�0–150 m and 155 m. DZ1 consists of medium-grained metagranite-granodiorite (101057) with subordinate occurrences of pegmatitic granite (101061), fine- to medium-grained metagabbro/metadiorite (1010��) and amphibolite (102017). Confidence level = �.

21

359–400 m

DZ2: Increased frequency of sealed fractures and sealed fracture networks, especially in the lower part. Two crush zones (� and 5 cm wide), one at the top and one near the bottom of the possible zone. Fracture apertures are typically less than 1 mm, with a few that ranges up to 2 mm. Faint to medium oxidation throughout the entire interval. The open/partly open fractures are predominantly gently dipping. The sealed fractures are both gently and steeply dipping. One set strikes NE or NNE. Other sealed steeply dipping fractures strike SE and dip variably to the SW. The most frequent fracture filling minerals in the order of decreasing abundance include calcite and chlorite. There is a general decrease in the bulk resistivity in combination with a large number of distinct low resistivity anomalies along the interval �85–�00 m. There is also a thin but distinct low P-wave velocity anomaly and caliper anomaly at section coordinate �9�.5 m. Nine non-oriented and five oriented radar reflectors are identified. The oriented radar reflectors occur at �61.7 m (190/9 or 109/68), �76.6 m (1�5/79 or 002/19), �80.9 m (1�0/90), �88.� m (115/66 or 161/5) and �92.9 m (262/11 or 111/79). One persistent non-oriented radar reflector intersects the borehole at �9� m with the angle �8 degrees and can be traced at least 80 m away from the borehole. Decreased radar amplitude at �60 m and �95 m. DZ2 consists of medium-grained metagranite-granodiorite (101057) with subordinate occurrences of pegmatitic granite (101061), fine- to medium-grained metagabbro/metadiorite (1010��) and amphibolite (102017). Confidence level = �.

415–489 m

DZ�: Increased frequency of sealed fractures and sealed fracture networks. Increased frequency of open fractures with apertures up to 6 mm in the uppermost part of the interval. Locally faint to weak oxidation and an interval of vuggy aplitic metagranite at �51.�–�52.2 m. Most fractures strike SW and dip variably to the NW. A subordinate set of steeply dipping sealed fractures strikes NNW. The most frequent fracture filling minerals in the order of decreasing abundance include calcite, chlorite, adularia and hematite. The interval c �19–�26 m is characterized by a large number of distinct low resistivity anomalies, decreased P-wave velocity and some caliper anomalies. The interval c ��2–�60 m is characterized by a large number of distinct low resistivity anomalies and partly decreased P-wave velocity. Twenty-for non-oriented and eight oriented radar reflectors are identified. The oriented radar reflectors occur at �25.9 m (091/�6 or 161/�8), ��0.0 m (160/�9 or 090/�5), ���.9 m (08�/57), ��9.0 m (0�8/89 or 21�/75), ��9.� m (08�/�5 or 16�/��), �5�.8 m (089/�8 or 167/�1), �60.8 m (09�/�2) and �80.1 m (1��/6� or 077/20). One persistent non-oriented radar reflector intersects the borehole at �77 m with the angle 50 degrees and can be traced at least 50 m away from the borehole. Decreased radar amplitude at the interval �20–��5 m, �50–�60 m and �70 m. DZ� consists of aplitic metagranite (101058) generally affected by faint to medium albitization, subordinate occurrences of fine- to medium-grained metagranitoid (101051), pegmatitic granite (101061) and amphibolite (102017). Confidence level = �.

502–555 m

DZ�: Increased frequency of sealed fractures, sealed fracture networks and, in the central part (5��–5�0 m), open fractures and crush zones (�, �, 5 and �0 cm wide). Fracture aper-tures are typically less than 1 mm, with some up to � mm. Most open/partly open fractures strike ESE and dip moderately to the SSW. However, fractures that strike NNE and are steeply dipping, that strike NW and dip steeply to the NE and that are gently dipping are also present. A similar pattern for the orientation of sealed fractures is apparent. However, the fractures within the different orientation sets are more evenly distributed.

22

The most frequent fracture filling minerals in the order of decreasing abundance include calcite, chlorite, adularia and hematite. There is a large number of distinct low resistivity anomalies along the entire section. The interval c 5�1–5�0 m is characterized by a major decrease in the bulk resistivity, a large decrease in P-wave velocity and several distinct caliper anomalies. Five oriented radar reflectors occur at 507.� m (��0/89 or 01�/�7), 509.8 m (150/56 or 085/29), 5��.8 m (171/�8 or 097/51), 5�7.� m (22�/88) and at 5�0.2 m (090/62). Sixteen non-oriented radar reflectors are identified. One persistent non-oriented radar reflector intersects the borehole at 5�8 m and can be traced at least �0 m away from the borehole. Decreased radar amplitude at the interval 5�0–5�0 m. Locally faint to weak oxidation. DZ� consists of aplitic metagranite (101058) generally affected by faint to medium albitization, subordinate occurrences of fine- to medium-grained metagranitoid (101051), pegmatitic granite (101061) and amphibolite (102017). Confidence level = �.

623–677 m

DZ5: Increased frequency of sealed fractures, sealed fracture networks and open fractures. Sealed fractures dominate. Fracture apertures are typically less than 1 mm, with two > 10 mm. Most fractures fall into four orientation sets. The steeply dipping sets strike NE, WNW and SSE (dip to WSW). The fourth set is gently dipping. The most frequent fracture filling minerals in the order of decreasing abundance include calcite, chlorite, adularia and hematite. There are increased occurrences of low resistivity anomalies, partly a slight decrease in the bulk resistivity and a few minor caliper anomalies. 28 identified radar reflectors, of which 11 are oriented. Five of them are oriented in the interval 20�–222/ 67–81 and two of them 200–2�0/6–1�. Other orientations are 106/7� or 211/27, �5�/65 and 059/8�. Two persistent radar reflectors intersect the borehole at 6�� m and 66� m with intersection angle 56 degrees and orientation 052/69, respectively. They can be traced at least 25 m away from the borehole. Decreased radar amplitude at 620 m, 6�0 m, 650 m, 665–670 m and 675 m. Locally faint to weak oxidation. DZ5 consists of aplitic metagranite (101058) generally affected by faint to medium albitization, subordinate occurrences of fine- to medium-grained metagranitoid (101051), pegmatitic granite (101061) and amphibolite (102017). Confidence level = 2.

2�

6 Comments

The result from the geological single-hole interpretation of KFM06C is presented in a WellCad plot (Appendix 1). The WellCad plot consists of the following columns: 1: Depth (Length along the borehole).2: Rock type.�: Rock alteration.�: Sealed fractures.5: Open and partly open fractures.6: Crush zones.7: Silicate density.8: Magnetic susceptibility.9: Natural gamma radiation.10: Estimated fracture frequency.11: Description: Rock unit.12: Stereogram for sealed fractures in rock unit (blue symbols).1�: Stereogram for open and partly open fractures in rock unit (red symbols).1�: Description: Possible deformation zone.15: Stereogram for sealed fractures in possible deformation zone (blue symbols).16: Stereogram for open and partly open fractures in possible deformation zone

(red symbols).

25

References

/1/ PeterssonJ,SkogsmoG,BergundJ,vonDalwigkI,WängnerudA,DanielssonP,2005. Boremap mapping of telescopic drilled borehole KFM06C. Forsmark site investigation. SKB P-06-79. Svensk Kärnbränslehantering AB.

/2/ MattssonHandKeisuM,2005. Interpretation of geophysical borehole measure-ments from KFM06C. Forsmark site investigation. SKB P-05-8�. Svensk Kärnbränslehantering AB.

/�/ GustafssonJandGustafssonC,2005. RAMAC and BIPS logging in borehole KFM06C. Forsmark site investigation. SKB P-05-2�2. Svensk Kärnbränslehantering AB.

/�/ StephensMB,LundqvistS,BergmanT,AnderssonJ,2003. Forsmark site investigation. Bedrock mapping. Rock types, their petrographic and geochemical characteristics, and a structural analysis of the bedrock based on Stage 1 (2002) surface data.SKB P-0�-75. Svensk Kärnbränslehantering AB.

/5/ MunierR,StenbergL,StanforsR,MilnesAG,HermansonJ,TriumfCA,2003. Geological site descriptive model. A strategy for the model development during site investigations. SKB R-0�-07. Svensk Kärnbränslehantering AB.

27

App

endi

x1

Geo

logi

cals

ingl

e‑ho

lein

terp

reta

tion

ofK

FM06

C

Gra

nite

, fin

e- to

med

ium

-gra

ined

Pegm

atite

, peg

mat

itic

gran

iteG

rani

te, g

rano

dior

ite a

nd to

nalit

e, m

etam

orph

ic, f

ine-

to m

ediu

m-g

rain

edG

rani

te, m

etam

orph

ic, a

pliti

cG

rani

te to

gra

nodi

orite

, met

amor

phic

, med

ium

-gra

ined

Dio

rite,

qua

rts d

iorit

e an

d ga

bbro

, met

amor

phic

Am

phib

olite

Fels

ic to

inte

rmed

iate

vol

cani

c ro

ck, m

etam

orph

ic

Oxi

dize

dC

hlor

itisi

zed

Epid

otis

ized

Qua

rtz d

isso

lutio

nA

rgill

izat

ion

Alb

itiza

tion

Saus

surit

izat

ion

dens

<268

0 (G

rani

te)

2680

<den

s<27

30 (G

rano

dior

ite)

2730

<den

s<28

00 (T

onal

ite)

2800

<den

s<28

90 (D

iorit

e)de

ns>2

890

(Gab

bro)

SILI

CA

TE D

ENSI

TYun

clas

sifie

dsu

s<0.

001

0.00

1<su

s<0.

010.

01<s

us<0

.1

SUSC

EPTI

BIL

ITET

uncl

assi

fied

gam

<20

20<g

am<3

636

<gam

<53

NA

TUR

AL

GA

MM

A

Sign

ed d

ata

Coo

rdin

ate

Syst

emR

T90-

RH

B70

Len

gth

[m]

1000

.430

Titl

eSI

NG

LE

HO

LE

INT

ER

PRE

TA

TIO

N K

FM06

C

Ele

vatio

n [m

.a.s.

l.]4.

09

Dia

met

er [m

m]

51B

oreh

ole

KFM

06C

Incl

inat

ion

[°]

-60.

11Si

teFO

RSM

AR

K

Nor

thin

g [m

]66

9974

0.96

Eas

ting

[m]

1632

437.

03

Surv

eyin

g D

ate

Dat

e of

map

ping

2005

-08-

29 0

8:00

:00

RO

CK

TYPE

FOR

SMA

RK

Bea

ring

[°]

26.0

7

Dri

lling

Sto

p D

ate

2005

-04-

13 1

2:15

:00

Plot

Dat

e20

06-0

4-04

21:

14:4

5

RO

CK

ALT

ERA

TIO

N

Dri

lling

Sta

rt D

ate

2005

-03-

09 0

8:30

:00

Roc

kTy

peR

ock

Alte

ratio

n

Ope

n an

dP

artly

Ope

nFr

actu

res

030

Sea

led

Frac

ture

s

030

Cru

sh

BO

REM

AP

DA

TA

Sili

cate

Den

sity

Nat

ural

Gam

ma

Rad

iatio

n

Mag

netic

Sus

cept

ibili

ty

Est

imat

edFr

actu

re F

req

(fr/m

)

020

GEN

ERA

LIZE

D G

EOPH

YSIC

AL

DA

TA

Des

crip

tion

Roc

k U

nit

Roc

k U

nit O

pen

and

Par

tly O

pen

Frac

ture

sR

ock

Uni

t Sea

led

Frac

ture

s

RO

CK

UN

IT

Des

crip

tion

Pos

sibl

e D

efor

mat

ion

Zone

Pos

sibl

e D

efor

mat

ion

Zone

O

pen

and

Par

tly O

pen

Frac

ture

sP

ossi

ble

Def

orm

atio

n Zo

ne S

eale

d Fr

actu

res

POSS

IBLE

DEF

OR

MA

TIO

N Z

ON

ESD

epth

1m:5

00m

40.0

50.0

60.0

70.0

80.0

90.0

100.

0

110.

0

120.

0

130.

0

140.

0

150.

0

160.

0

170.

0

102.

13

102.

00D

Z1In

crea

sed

frequ

ency

of

seal

ed a

nd o

pen

fract

ures

. S

eale

d fra

ctur

e ne

twor

ks

are

conc

entra

ted

in th

e up

per h

alf,

whi

le o

pen

fract

ures

with

ape

rture

s ov

er 1

0 m

m a

nd a

5 c

m

wid

e cr

ush

zone

are

co

ncen

trate

d in

the

low

er

half.

Fra

ctur

e ap

ertu

res

are

typi

cally

less

than

1

mm

. Fai

nt to

med

ium

ox

idat

ion

thro

ugho

ut th

e en

tire

inte

rval

. The

op

en/p

artly

ope

n fra

ctur

es

are

pred

omin

antly

gen

tly

dipp

ing.

The

sea

led

fract

ures

are

bot

h ge

ntly

an

d st

eepl

y di

ppin

g w

ith a

va

riabl

e st

rike

in th

e st

eepl

y di

ppin

g fra

ctur

es.

The

mos

t fre

quen

t fra

ctur

e fil

ling

min

eral

s in

the

orde

r of

dec

reas

ing

abun

danc

e in

clud

e ca

lcite

, chl

orite

, cl

ay m

iner

als,

pyr

ite,

hem

atite

and

a fe

w

fract

ures

with

asp

halt.

La

rge

num

ber o

f dis

tinct

lo

w re

sist

ivity

ano

mal

ies

alon

g th

e en

tire

defo

rmat

ion

zone

. The

re is

al

so a

gen

eral

dec

reas

e in

th

e bu

lk re

sist

ivity

in

com

bina

tion

with

low

P

-wav

e ve

loci

ty a

nom

alie

s in

the

inte

rval

c. 1

40-1

55

m. T

wen

ty n

on-o

rient

ed

and

five

orie

nted

rada

r re

flect

ors

are

iden

tifie

d.

The

orie

nted

rada

r re

flect

ors

occu

r at 1

38.5

m

(180

/89)

, 139

.8 m

(209

/17

0°

270°

90°

180°

0°

270°

90°

180°

Page 1

28

180.

0

190.

0

200.

0

210.

0

220.

0

230.

0

240.

0

250.

0

260.

0

270.

0

280.

0

290.

0

300.

0

310.

0

320.

0

330.

0

340.

0

350.

0

360.

0

370.

0

380.

0

RU

1M

ediu

m-g

rain

edm

etag

rani

te-g

rano

dior

ite(1

0105

7) w

ith s

ubor

dina

te

occu

rren

ces

of p

egm

atiti

c gr

anite

(101

061)

, fin

e- to

m

ediu

m-g

rain

edm

etag

abbr

o/m

etad

iorit

e(1

0103

3) a

nd a

mph

ibol

ite

(102

017)

. In

addi

tion,

a

few

occ

urre

nces

of f

elsi

c to

in

term

edia

te m

etav

olca

nic

rock

(103

076)

, fin

e- to

m

ediu

m-g

rain

edm

etag

rani

toid

(101

051)

an

d ap

litic

met

agra

nite

(1

0105

8). A

nom

alou

sly

high

freq

uenc

y of

ope

n an

d se

aled

frac

ture

s in

two

inte

rval

s (2

05-2

30 a

nd

284-

305

m) r

elat

ive

to th

e be

droc

k ou

tsid

e po

ssib

le

defo

rmat

ion

zone

s. T

he

low

er in

terv

al a

lso

incl

udes

a

10 c

m w

ide

crus

h zo

ne.

Ano

mal

ousl

y lo

w m

agne

tic

susc

eptib

ility

(5-2

0×10

-5

SI)

in th

e in

terv

al 2

00-2

70

m, w

hich

cor

resp

onds

to a

gr

eyis

h va

riety

of t

he

med

ium

-gra

ined

met

agra

nite

-gra

nodi

orite

(101

057)

. Unc

erta

inty

= 3

.

169.

00

(104

/67)

,151

.9m

(112

/64

or 0

20/3

) and

at 1

52.6

m

(183

/82)

. Dec

reas

ed ra

dar

ampl

itude

at 1

05 m

, 11

5-12

0 m

, 125

-130

m,

140-

150

m a

nd 1

55 m

. D

Z1 c

onsi

sts

of

med

ium

-gra

ined

met

agra

nite

-gra

nodi

orite

(101

057)

with

sub

ordi

nate

oc

curr

ence

s of

peg

mat

itic

gran

ite (1

0106

1), f

ine-

to

med

ium

-gra

ined

met

agab

bro/

met

adio

rite

(101

033)

and

am

phib

olite

(1

0201

7). U

ncer

tain

ty=

3.

359.

00D

Z2In

crea

sed

frequ

ency

of

seal

ed fr

act.

and

seal

ed

fract

. net

wor

ks, e

spec

ially

in

the

low

er p

art.

Two

crus

h zo

nes

(4 a

nd 5

cm

w

ide)

, one

at t

he to

p an

d on

e ne

ar th

e bo

ttom

of

DZ2

. Fra

ct. a

pertu

res

are

typi

cally

less

than

1 m

m,

with

a fe

w th

at ra

nges

up

to 2

mm

. Fai

nt to

med

ium

ox

idat

ion

thro

ugho

ut D

Z2.

The

open

/par

tly o

pen

fract

. ar

e pr

ed. g

ently

dip

ping

. Th

e se

aled

frac

t. ar

e bo

th

gent

ly a

nd s

teep

ly d

ippi

ng.

One

set

stri

kes

NE

or

NN

E. O

ther

sea

led

stee

ply

dipp

ing

fract

ures

stri

ke S

E

and

dip

varia

bly

to th

e S

W.

The

mos

t fre

quen

t fra

ct.

fillin

g m

iner

als

in th

e or

der

of d

ecre

asin

g ab

unda

nce

incl

ude

calc

ite a

nd

chlo

rite.

The

re is

a g

ener

al

decr

. in

the

bulk

resi

stiv

ity

in c

ombi

natio

n w

ith a

larg

e nu

mbe

r of d

istin

ct lo

w

resi

stiv

ity a

nom

alie

s al

ong

the

inte

rval

385

-400

m.

Ther

e is

als

o a

thin

but

di

stin

ct lo

w P

-wav

e ve

l. l

dli

0°

270°

90°

180°

0°

270°

90°

180°

0°

270°

90°

0°

270°

90°

Page 2

29

390.

0

400.

0

410.

0

420.

0

430.

0

440.

0

450.

0

460.

0

470.

0

480.

0

490.

0

500.

0

510.

0

520.

0

530.

0

540.

0

550.

0

560.

0

570.

0

580.

0

590.

0

411.

1541

1.15

RU

2aA

pliti

c m

etag

rani

te

(101

058)

gen

eral

ly

affe

cted

by

fain

t to

med

ium

al

bitiz

atio

n, w

hich

in p

art

corr

espo

nds

to d

ecre

ased

na

tura

l gam

ma

radi

atio

n.

Sub

ordi

nate

occ

urre

nces

of

fine

- to

med

ium

-gra

ined

m

etag

rani

toid

(101

051)

, pe

gmat

itic

gran

ite

(101

061)

and

am

phib

olite

(1

0201

7). I

n ad

ditio

n, o

ne

occu

rren

ce o

f fin

e- to

m

ediu

m-g

rain

edqu

artz

-bea

ring

met

adio

rite

(101

033)

and

one

of f

elsi

c to

inte

rmed

iate

m

etav

olca

nic

rock

(1

0307

6). A

nom

alou

sly

400.

00

anom

aly

and

calip

eran

omal

y at

394

.5 m

. Nin

e no

n-or

ient

ed a

nd fi

ve

orie

nted

rada

r ref

l. ar

e id

entif

ied.

Orie

nted

occ

ur

at 3

61.7

m (1

90/9

or

109/

68),

376.

6 m

(135

/79

or 0

02/1

9), 3

80.9

m

(140

/90)

, 388

.4 m

(115

/66

or 1

61/5

) and

392

.9 m

(2

62/1

1 or

111

/79)

. One

pe

rsis

tent

non

-orie

nted

re

flect

or in

ters

ects

the

bore

hole

at 3

94 m

with

the

angl

e 38

deg

rees

and

can

be

trac

ed a

t lea

st 8

0 m

aw

ay fr

om th

e bo

reho

le.

Dec

r. ra

dar a

mpl

. at 3

60 m

an

d 39

5 m

. DZ2

con

sist

s of

med

ium

-gra

ined

m

etag

rani

te-g

rano

dior

ite(1

0105

7) w

ith s

ubor

d.

occu

rren

ces

of p

egm

atiti

c gr

anite

(101

061)

, fin

e- to

m

ediu

m-g

rain

edm

etag

abbr

o/m

etad

iorit

e(1

0103

3) a

nd a

mph

ibol

ite

(102

017)

. Unc

erta

inty

= 3

415.

00D

Z3In

crea

sed

freq.

of s

eale

d fra

ct. a

nd s

eale

d fra

ct.

netw

orks

. Inc

r. fre

q. o

f op

en fr

act.

with

ape

rture

s up

to 6

mm

in th

e up

perm

ost p

art o

f the

in

terv

al. L

ocal

ly fa

int t

o w

eak

oxid

atio

n an

d an

in

terv

al o

f vug

gy a

pliti

c m

etag

rani

te a

t 45

1.4-

452.

2 m

. Mos

t fra

ct.

strik

e S

W a

nd d

ip v

aria

bly

to th

e N

W. A

sub

ordi

nate

se

t of s

teep

ly d

ippi

ng

seal

ed fr

act.

strik

es N

NW

. Th

e m

ost f

requ

ent f

ract

. fil

ling

min

eral

s in

the

orde

r of

dec

reas

ing

abun

danc

e in

clud

e ca

lcite

, chl

orite

, ad

ular

ia a

nd h

emat

ite. T

he

inte

rval

c. 4

19-4

26 m

is

char

act.

by a

larg

e nu

mbe

r of

dis

tinct

low

resi

stiv

ity

anom

alie

s, d

ecr.

P-w

ave

vel.

and

som

e ca

liper

an

omal

ies.

The

inte

rval

c.

442-

460

m is

cha

ract

. by

a la

rge

num

ber o

f dis

tinct

lo

w re

s. a

nom

alie

s an

d pa

rtly

decr

. P-w

ave

vel.

Twen

ty-fo

r non

-orie

nted

an

d ei

ght o

rient

ed ra

dar

refle

ctor

s ar

e id

entif

ied.

Th

e or

ient

ed re

fl. o

ccur

at

425.

9 m

(091

/46

or

161/

38),

430.

0 m

(160

/39

or 0

90/4

5), 4

44.9

m

(084

/57)

, 449

.0 m

(048

/89

or 2

13/7

5), 4

49.4

m

(084

/45

or16

3/43

)45

38

0°

270°

90°

180°

0°

270°

90°

180°

180° 0°

270°

90°

180° 0°

270°

90°

180°

180° 0°

270°

90°

180° 0°

270°

90°

180°

Page 3

�0

600.

0

610.

0

620.

0

630.

0

640.

0

650.

0

660.

0

670.

0

680.

0

690.

0

700.

0

710.

0

720.

0

730.

0

740.

0

750.

0

760.

0

770.

0

780.

0

790.

0

800.

0

745.

05

()

yhi

gh fr

eque

ncy

of s

eale

d fra

ctur

es a

nd lo

cally

fain

t to

wea

k ox

idat

ion

belo

w

560

m re

lativ

e to

the

uppe

r pa

rt of

the

bore

hole

ou

tsid

e po

ssib

le

defo

rmat

ion

zone

s.

Unc

erta

inty

= 3

.

745.

05

785.

47

RU

3A

mph

ibol

ite (1

0201

7) w

ith

subo

rdin

ate

occu

rren

ces

of

pegm

atiti

c gr

anite

(1

0106

1). U

ncer

tain

ty =

3.

785.

47

796.

30

RU

4Fe

lsic

to in

term

edia

te

met

avol

cani

c ro

ck

(103

076)

. Unc

erta

inty

= 3

.

796.

30

489.

00

(084

/45

or16

3/43

),45

3.8

m (0

89/4

8 or

167

/41)

, 46

0.8

m (0

94/3

2) a

nd

480.

1 m

(144

/64

or

077/

20).

One

per

sist

ent

non-

orie

nted

refl.

in

ters

ects

at 4

77 m

with

th

e an

gle

50 d

egre

es a

nd

can

be tr

aced

at l

east

50

m a

way

from

the

bore

hole

. D

ecr.

rada

r am

plitu

de a

t 42

0-43

5 m

, 450

-460

m

and

470

m. D

Z3 c

onsi

sts

of a

pliti

c m

etag

rani

te

(101

058)

gen

eral

ly

affe

cted

by

fain

t to

med

ium

al

bitiz

atio

n, s

ubor

dina

te

occu

rren

ces

of fi

ne- t

o m

ediu

m-g

rain

edm

etag

rani

toid

(101

051)

, pe

gmat

itic

gran

ite

(101

061)

and

am

phib

olite

(1

0201

7).

Unc

ert.

= 3.

502.

00D

Z4In

cr. f

req.

of s

eale

d fra

ct.,

seal

ed fr

act.

netw

orks

and

, in

the

cent

ral p

art

(534

-540

m),

open

frac

t. an

d cr

ush

zone

s (3

, 3, 5

an

d 40

cm

wid

e). F

ract

. ap

ertu

res

are

typi

cally

less

th

an 1

mm

, with

som

e up

to

3 m

m. M

ost o

pen/

partl

y op

en fr

act.

strik

e E

SE

and

di

p m

oder

atel

y to

the

SS

W. H

owev

er, f

ract

. tha

t st

rike

NN

E a

nd a

re s

teep

ly

dipp

ing,

that

stri

ke N

W

and

dip

stee

ply

to th

e N

E

and

that

are

gen

tly d

ippi

ng

are

also

pre

sent

. A s

imila

r pa

ttern

for t

he o

rient

atio

n of

sea

led

fract

. is

appa

rent

. How

ever

, the

fra

ct. w

ithin

the

diff.

or

ient

atio

n se

ts a

re m

ore

even

ly d

istr.

The

mos

t fre

q. fr

act.

fillin

g m

iner

als

in th

e or

der o

f dec

r. ab

unda

nce

incl

. cal

cite

, ch

lorit

e, a

dula

ria a

nd

hem

atite

. The

re is

a la

rge

num

ber o

f dis

tinct

low

res.

an

omal

ies

alon

g th

e en

tire

sect

ion.

The

inte

rval

c.

531-

540

m is

cha

ract

. by

a m

ajor

dec

r. in

the

bulk

re

s., a

larg

e de

cr. i

n P

-wav

e ve

l. an

d se

vera

l di

st. c

alip

er a

nom

alie

s.

Five

orie

nted

rada

r ref

l. oc

cur a

t 507

.4 m

(340

/89

or 0

14/3

7), 5

09.8

m

(150

/56

or 0

85/2

9), 5

33.8

m

(171

/38

or 0

97/5

1),

537.

3 m

(223

/88)

and

at

540.

2 m

(090

/62)

. Six

teen

no

n-or

ient

ed re

fl. a

re

iden

tifie

d. O

ne p

ersi

sten

t

0°

270°

90°

180° 0°

0°

270°

90°

180° 0°

0°

270°

90°

180°

0°

270°

90°

180°

Page 4

�1

810.

0

820.

0

830.

0

840.

0

850.

0

860.

0

870.

0

880.

0

890.

0

900.

0

910.

0

920.

0

930.

0

940.

0

950.

0

960.

0

970.

0

980.

0

990.

0

1000

.0

1010

.0

898.

13

RU

2bA

pliti

c m

etag

rani

te

(101

058)

gen

eral

ly

affe

cted

by

fain

t to

med

ium

al

bitiz

atio

n, w

hich

in p

art

corr

espo

nds

to d

ecre

ased

na

tura

l gam

ma

radi

atio

n an

d sl

ight

ly in

crea

sed

dens

ity.

Sub

ordi

nate

oc

curr

ence

s of

fine

- to

med

ium

-gra

ined

met

agra

nito

id (1

0105

1),

pegm

atiti

c gr

anite

(1

0106

1), m

ediu

m-g

rain

ed

met

agra

nite

-gra

nodi

orite

(101

057)

and

am

phib

olite

(1

0201

7). I

n ad

ditio

n, a

fe

w m

etre

wid

e in

terv

al

dom

inat

ed b

y ca

lc-s

ilica

te

rock

(108

019)

. A

nom

alou

sly

high

fre

quen

cy o

f sea

led

fract

ures

, sea

led

fract

ure

netw

orks

and

loca

lly fa

int

to w

eak

oxid

atio

n re

lativ

e to

the

uppe

r par

t of t

he

bore

hole

out

side

pos

sibl

e de

form

atio

n zo

nes.

U

ncer

tain

ty =

3.

898.

13

951.

23

RU

5Fo

liate

d, fi

ne- t

o m

ediu

m-g

rain

edm

etag

rani

te-g

rano

dior

ite(1

0105

7) w

ith s

ubor

dina

te

occu

rren

ces

of p

egm

atiti

c gr

anite

(101

061)

and

am

phib

olite

(102

017)

. A

nom

alou

sly

high

fre

quen

cy o

f sea

led

fract

ures

, sea

led

fract

ure

netw

orks

and

fain

t to

wea

k ox

idat

ion

rela

tive

to th

e up

per p

art o

f the

bor

ehol

e ou

tsid

e po

ssib

le

defo

rmat

ion

zone

s. P

artly

de

crea

sed

mag

netic

su

scep

tibili

ty (<

0.00

1 S

I) in

th

e in

terv

al c

. 919

-940

m.

Unc

erta

inty

= 3

.

951.

23R

U6

Apl

itic

met

agra

nite

(1

0105

8), g

ener

ally

af

fect

ed b

y fa

int t

o m

ediu

m

albi

tizat

ion,

folia

ted,

fine

- to

med

ium

-gra

ined

m

etag

rani

te-g

rano

dior

ite(1

0105

7) a

nd p

egm

atiti

c gr

anite

(101

061)

. S

ubor

dina

te o

ccur

renc

es

of a

mph

ibol

ite (1

0201

7).

Ano

mal

ousl

y hi

gh

frequ

ency

of s

eale

d fra

ctur

es, s

eale

d fra

ctur

e ne

twor

ks a

nd fa

int t

o w

eak

oxid

atio

n re

lativ

e to

the

uppe

r par

t of t

he b

oreh

ole

tid

ibl

555.

00pno

n-or

ient

ed re

fl. in

ters

. at

538

m, c

an b

e tra

ced

at

leas

t 40

m fr

om th

e bo

reho

le. D

ecr.

rada

r am

pl. a

t the

inte

rval

53

0-54

0 m

. Loc

. fai

nt to

w

eak

oxid

. DZ4

con

sist

s of

ap

litic

met

agra

nite

(1

0105

8) g

en. a

ffect

ed b

y fa

int t

o m

ediu

m

albi

tizat

ion,

sub

. occ

ur. o

f fin

e- to

med

ium

-gra

ined

m

etag

rani

toid

(101

051)

, pe

gmat

itic

gran

ite

(101

061)

and

am

ph.

(102

017)

. Unc

.= 3

.

623.

00D

Z5In

crea

sed

frequ

ency

of

seal

ed fr

actu

res,

sea

led

fract

ure

netw

orks

and

op

en fr

actu

res.

Sea

led

fract

ures

dom

inat

e.

Frac

ture

ape

rture

s ar

e ty

pica

lly le

ss th

an 1

mm

, w

ith tw

o >1

0 m

m. M

ost

fract

ures

fall

into

four

or

ient

atio

n se

ts. T

he

stee

ply

dipp

ing

sets

stri

ke

NE

, WN

W a

nd S

SE

(dip

to

WS

W).

The

four

th s

et is

ge

ntly

dip

ping

. The

mos

t fre

quen

t fra

ctur

e fil

ling

min

eral

s in

the

orde

r of

decr

easi

ng a

bund

ance

in

clud

e ca

lcite

, chl

orite

, ad

ular

ia a

nd h

emat

ite.

Ther

e ar

e in

crea

sed

occu

rren

ces

of lo

w

resi

stiv

ity a

nom

alie

s, p

artly

a

slig

ht d

ecre

ase

in th

e bu

lk re

sist

ivity

and

a fe

w

min

or c

alip

er a

nom

alie

s.

28 id

entif

ied

rada

r re

flect

ors,

of w

hich

11

are

orie

nted

. Fiv

e of

them

are

or

ient

ed in

the

inte

rval

20

3-22

2/67

-81

and

two

of

them

200

-230

/6-1

3. O

ther

or

ient

atio

ns a

re 1

06/7

4 or

21

1/27

, 354

/65

and

059/

84. T

wo

pers

iste

nt

rada

r ref

lect

ors

inte

rsec

t th

e bo

reho

le a

t 644

m a

nd

664

m w

ith in

ters

ectio

n an

gle

56 d

egre

es a

nd

orie

ntat

ion

052/

69,

resp

ectiv

ely.

The

y ca

n be

tra

ced

at le

ast 2

5 m

aw

ay

from

the

bore

hole

. D

ecre

ased

rada

r am

plitu

de a

t 620

m, 6

40

m, 6

50 m

, 665

-670

m a

nd

675

m. L

ocal

ly fa

int t

o w

eak

oxid

atio

n. D

Z5

cons

ists

of a

pliti

c m

etag

rani

te (1

0105

8)

gene

rally

affe

cted

by

fain

t to

med

ium

alb

itiza

tion,

b

di

270°

90°

180° 0°

270°

90°

180° 0°

270°

90°

180° 0°

270°

90°

180°

270°

90°

180° 0°

270°

90°

180° 0°

270°

90°

180° 0°

270°

90°

180°

Page 5

�2

1020

.0

1030

.0

1000

.43

outs

ide

poss

ible

defo

rmat

ion

zone

s. P

artly

de

crea

sed

mag

netic

su

scep

tibili

ty (<

0.00

1 S

I) an

d na

tura

l gam

ma

radi

atio

n (<

20 µ

R/h

) in

the

inte

rval

c. 9

74-9

84 m

. U

ncer

tain

ty =

3.

677.

00

subo

rdin

ate

occu

rren

ces

of fi

ne- t

o m

ediu

m-g

rain

ed

met

agra

nito

id (1

0105

1),

pegm

atiti

c gr

anite

(1

0106

1) a

nd a

mph

ibol

ite

(102

017)

. U

ncer

tain

ty =

2.

Page 6