049006

The Gog Range data proved very affected by geologic noise indicating that there is considerable difference between the conductivity of the various units in the area but no clear conductive response was detected. within 80 metres of the surface. It is recommended that:1. The Garden of Eden grid be extended to the east to cover a possible east plunging extension of the source of the anomaly and that when the anomaly is fully located it be tested by drilling. 2. The Simonds anomaly be mapped and tested by drilling on line 2l00W where there is best coincidence between the UTEM and GENIE responses. 3. No further geophysical work or drilling be done on the Lake Barrington prospect in light of the present economic constraints. 4. At present it appears that it is unlikely that we will be able to fit in an ore body of the size that is required by CRA in the present economic climate at Gog Range. If the money becomes available and the GENIE system is available in Tasmania it should not be expensive to attempt to relocate the old geochemical survey lines in order to quickly outline the small conductor on the western end of the grid. It is therefore inferred that there is no sizeable massive sulphide body

4. 4.1 Survey Parameters

DISCUSSION
All lines were pegged at 25 metre spacings using compass and topofil.

049007

UTEM The UTEM III system was used to take readings of the vertical field at 25 metre intervals. A frequency of 26.23Hz was used.
GENIE The Scintrex SE-88 GENIE frequency EM system was used to take readings of two frequency pairs (3037.5Hz/112.5Hz and 337.5Hz/112.5Hz) at 25 metre intervals along four lines on the Simonds grid and seven lines on the Gog Range grid. The GENIE traverses were performed with a TX/RX separation of 100 metres except in the case of line 38E at Gog Range which was traversed at a spacing. 50 metre
VLFEM The Phoenix VLF1 system was used to measure the VLF response along lines 2000W and 2100W on the Simonds grid. 25 metre spacings. Readings were taken at North West Cape was used

as the transmitting station.
Ground Magnetics Readings were taken at 12.5 metre spacings on all lines on the grids in the Beulah area with a Geometries G856 proton precession magnetometer.
Data Presentation 4.2.1 Simonds, Beulah and Garden of Eden Grids The data is presented in the form of continuously normalised profiles and as contour plans for channel four and five.

049008

The contour plans are produced by removing a half space response from the continuously normalised data and processing the result with Fraser's filter to cause the typical crossover anomalies to be depicted as peaks. The result is at best a guide to relative The position of the anomaly positions.
anomalies is sometimes shifted by the processing, so one should refer to the anomaly plan for actual ground location. The VLFEM and GENIE results are presented as profiles.
Lake Barrington Grid The UTEM results are presented as profiles of continuously normalised data, contour plots of point normalised data within the loop and contour plots of Fraser filtered data within the loop area.
Gog Range The data is presented as profiles of the two frequency pairs and a plan showing positions of possible conductors.

INTERPRETATION

Anomalies were appraised with an eye to finding anything that would have escaped the notice of previous workers. depth of fifty metres was decided as an arbitrary cut off above which earlier geochemical and geophysical programmes would have located a large body. Of course if anything particularly interesting had arisen it would not have been passed over simply on the basis of this criterion. A

049009

Simonds, Beulah and Garden of Eden Grids After reduction of the UTEM data for the recent surveys and the older Beulah survey, and the production of EM contour plans it becomes evident that there is considerable conductivity variation between the various lithologies with the shales to the south of Garden of Eden and to a lesser extent Beulah showing up very strongly. Many minor zones also can be seen persisting as small shallow (narrow) conductors trending across a number of lines. The anomalies that have previously been tested by RDB4 BB3 and DDB4 BB4 can be seen on the contour plan of channel six to be shallow localised conductive zones (equating depth to be broadly related to anomaly width). There can be seen to be a weakly conductive PDB3 BBl seems zone around the barite occurrence.

to have been drilled into the edge of the shales where there is a discontinuity in the contact. Two new targets have arisen out of the survey. be deep enough to not have been obvious before. The better of the two anomalies lies on the Simonds grid and is visible on lines 2000W, 2l00W, 2200W and 2300W though the response is somewhat questionable on line 2300W as it may be due to a shallower source. The anomaly shape is somewhat complicated on line 2000W by the apparently abrupt termination of the body to the east but the depth from peak to peak can be estimated at approximately 60 metres and the time constant is of the order of.6 msecs though it matches poorly with the type curves. On line 2l00W the UTEM The time constant anomaly is better defined and indicates that the body is slightly deeper at 75 metres. is.6 msecs which continues to be lower than one would Both
are continuous across a number of lines and appear to

049010

expect from a massive sulphide body though just at the lower limit of those recorded from the Hellyer deposit. The source of the response appears in Time both cases to dip steeply to the north. as a thin dyke or as a block.
constants were of a similar order whether modelled The anomaly continues across the next two lines but is not complete to the north making quantitative interpretation impossible. The anomaly was retested on line 2l00W using VLFEM in order to determine whether there was any surficial enhancement of the body through current channeling effects. There was no anomaly on the maximum was recorded at 5525N, fifty metres As the horizontal field measurements but on the dip angle a

broadanomal~

north of the UTEM anomaly centred at 5475N.
indications are that the anomaly dips north, this is unlikely to be due to the same source as the UTEM response. A strongly pronounced shallow conductor It did was detected by VLFEM at 5170N on line 2100W.
not appear on the UTEM traverses and so is assumed to be very localised possibly associated with a fault with relatively shallow weathering. As the Scintrex's reconnaissance frequency EM system, the GENIE, was being used on nearby prospects it was proposed that this could be used to better define the extent and position of the anomaly as it had been interpreted to lie within 70 metres of the surface, well within the theoretical penetration limit of the GENIE system. It was first tested on lines 2000W and 2l00W and as anomalies were recorded on these lines traverses were performed on lines 2200W and 2300W which were extended to the north using the distance monitoring capability of the GENIE in order to close off the anomaly. The anomaly was located on lines 2000W, 2l00W and 2200W but on line 2300W it appeared to be too deep to be clearly distinguishable

anomaly extends across lines 5200E, 5300E and 5400E
anomaly on all lines only lasts to channel five with only random noise and surface effects being visible on channel four. It has a decay constant of 0.44 It is not associated with any which is somewhat below the response expected from a massive sulphide body. geochemical anomaly which is worrying considering that it gets within 50 metres of the surface at its shallowest point. As the anomaly has such a low conductivity and was not locateable by the GENIE and has no geochemistry associated with it, it would probably require more encouragement in the area to drill, such as a promising intersection on the Simonds prospect though at this stage drilling is the only way to test it conclusively.

049013

A number of other smaller conductors were located on the grids as can be seen from the various contour plans and from the anomaly position plan. These are generally too shallow to be due to sulphide bodies without also giving some geochemical response or of too small extent to possibly fit a body of the size that we require. All have been tested by soil geoApart from near and along chemistry and found wanting.
strike from the Simonds conductor and also near the original baryte occurrence there is little that could be considered anomalous in the geochemistry. Thus none of the remaining anomalies seem to require further testing.
Lake Barrington Grid UTEM was completed across the whole of the old grid and the extended portion of the grid. The loop was positioned over the area previously found to give an anomalous IP response in order to minimise the current channeling effects which the resistivity data indicated might be a problem. grid. The only definite anomaly located on the survey was at the northern end of the extended This took the form of a typical distal thin A layer response and is taken to be the edge of the basalt that forms the northern boundary of the grids. number of very subtle anomalies were isolated by the filtering process but these do not seem to be conductive enough nor deep enough to be what we want. At this stage the only further work that I can think of on this prospect is testing by drilling of the down hole EM anomaly previously recorded on this prospect. Unfortunately the downhole anomaly does not seem to have been located with the surface UTEM and this seems to indicate that it is in all likelihood too small for us to be interested in.

Geological Atlas, 1 Mile Series Sheet 37, Sheffield. Explanatory Report. Dept. of Mines Tasmania

Purvis J G

Exploration on the Gowrie Park Grid June 1977-February 1978, EL 3/73 Northern Tasmania. No. 9160. CRAE Report

von Strokirch T

Electromagnetic Surveys in the Sheffield Area EL (7/73) in Tasmania during 1985 CRAE Report No. 13461.

13. Temby P A 1985

049016
Relinguishment Report for Part of EL 7/73 Sheffield, Northern Tasmania. CRAE Report No. 13060.

Temby P A

EL 10/76 Cethana Area, Northern Tasmania. Report on Exploration for 12 months to 29 February 1985. CRAE Report No. 13109.
EL 7/73 Sheffield Area, Northern Tasmania, Report on Exploration for 12 months to 15th February, 1985 CRAE Report No. 13108.

Weber G B

Exploration at the Lake Barrington Copper Prospect, Sheffield EL 7/73, Northern Tasmania, May 1981 December 1982. CRAE Report No. 11934.
Exploration at the Lake Barrington Prospect, Sheffield EL 7/73, f Northern Tasmania for the period ending December 1983. No. 12421. CRAE Report
Exploration in the Vicinity of Mt. Roland, Sheffield EL 7/73. CRAE Report No. 12182.
Exploration Results Beulah, Staverton, Gog Range and Ireland Prospects Sheffield EL 7/73, Tasmania. 1984. CRAE Report No. 12497. Report for the 12 months ending 15 February
14. 7. Burnie 1:Sheet 8. LOCATION SkKEYWORDS
I I I I I I I I I I I I I I I I I I I 'I

049017

Cambrian, volcanics, pyro-clastics, shales, Geophysics, Em, GENIE-EM, UTEM, Geochemistry, VLFEM, Ground Magnetics.
LIST OF PLANS Title Scale 1: 2 500

Plan No. TASh 2767

SHEFFIELD EL 7/73 Beulah Extended Grid UTEM Survey Loop 2 Line 800W SHEFFIELD EL 7/73 Beulah Extended Grid UTEM Survey Loop 2 Line 700W SHEFFIELD EL 7/73 Beulah Extended Grid UTEM Survey Loop 2 Line 600W SHEFFIELD EL 7/73 Beulah Extende.d Grid UTEM Survey Loop 2 Line 50 OW SHEFFIELD EL 7/73 Beulah Extended Grid UTEM Survey Loop 2 Line 400W SHEFFIELD EL 7/73 Garden of Eden Grid UTEM Survey Loop 1 Line 5600E SHEFFIELD EL 7/73 Garden of Eden Grid UTEM Survey Loop 1 Line 5500E SHEFFIELD EL 7/73 Garden of Eden Grid UTEM Survey Loop 1 Line 5400E SHEFFIELD EL 7/73 Garden of Eden Grid UTEM Survey Loop 1 Line 5300E Point

TASh 2768

1:2 500

TASh 2769

1: 2 500

TASh 2770

TASh 2771

TASh 2772

fr.q(h2)

26. 230

e.':l c

- - - - -, - - - - - - - - - - - - - - - ol.a

1./5'11

UTEM SURWEY

ProJecl "reo

co,.,ducl.d by

PMM DGH

fr.qChz)
Seu I ah Ex lended Gr I d Sw-v.y for eRA Exp lor a l 'on Lcop,.,o 0002 L I,.,. 500", COlllP0"'.'" \ Hz co,.,dory Ctl I
_----------------- - '"

UTEM SURVEY

ProJ.cl Ar.o 8~u I oh

conducl.d by

859 I eRA Exp lor a l 'on

Ch I freq(hz'

Loopno

.0.0.02

Ex lended Gr I d 4geW cOlllpon.nl Hz

SlM"v.'1' for

26.239

condory

rASh 1771
--------------------4 eeN

Project. ArGo

conduol.d by PMM DGH

E)(p I oral' on

f"r.q(t'lz'

Gorden of Eden

S.rv.v f"or eRA

oOllponenl

o-mdarv

~_-_~----------------

UTEM SURVEY oondualed by PMM DGH Job 8501 f ProJeel Area Gar den of Eden Survey for eRA Exp 1or a lIon Loopno 0001 Line 5500E oolllponen l Hz.econdory Ch I

freq(hz'

~-------------------o

lS) lS)

UTEM SURVEY conducled by PMM DGH.Job 860 t ProJecl Area Garden of Eden Survey for eRA Exp I oral I on Loopno 000 t LIne 5400E co.poroe"l Hz c,)"dary Ch I

fr.qC:hz)

rASh 2774

----~'------

UTEM SURVEY conducLed by PMM DGH Job 850 t ProJecL Area Gar den of Eden Survey for eRA Exp I oral I on Loopno 000 t Line 5300E co.ponenL Hz.econdary Ch I

freq'hz)

--------------------r

PrQJ.cl Ar.o LQQpnQ

oonduol.d by

Ghrden of Eden

Surv.y fQr

OQllp_n l

eRA E)(plorallon Hz oondary Ch

I"

rASh 2776

--------------------48e

UTEM SURVEY oo",duoled by PMM DGH.Job 850 I ProJeol Area G,orden of Eden Survey for eRA Exp I oral Ion Loop",o e001 LI",e 530eE cOllpcne",l Hz.eOl~dory Ch I

freq(hz)

--------------------.

U1EM SURVEY

Project Ar. o

LQopno

conduct. d by

Survey for

froq<hz)

Gar" den of Eden

CPA Exp lor ali on. c:mdory

26.2313

1313131

COll'lponenl

5e13eN

5113eN

52130N

5313131\1

-- ----~--- - - - -
t---ji+'+----.---~1t__----------It"------.Ir-i-l-----------.4--

Project Ar. o Locpno

"C'r-,rl"cl. d by

S'~rvey for

freqChz;)

Gar-den of Eden

eRA Exploral ion

secondary

26.23e

51 00E

componenl

rASh 2779

--------------------4700N

---~--+-

541313

L",opno

SUr~VEY

conducted by

freqCh:z:)

Project Ar. ",

eRA. Exp I orot jon

. condary

1300 I

compon." l.

UTEM SURVEY oonduoled by PMM DGH.Job 8501 ProJecl Area Gorden of Eden Survey for CFi:A Explorollon Loopno 000 t 1. Ine 4800E oOllponen l Hz.ee.mdary Ch I

f,.eq(hz;)

--------------------4800N

-~-t'---

conck.lcled by

ProJecl Area

freqChz)
Gar den of Eden S\.Irvey for eRA Exp I or a lion Loopno 000 I L' n. 4800E oollpon."l Hz eecrondorv Ch I

--------------------o

-------~~.-_+4f_fiJ_-_+----__1_~---~I__'____f-I_-

-- -----------

'--I..L-.l..
UTEM SURVEY oo"d\.Iot.d by PMM DGH Job 8501 ProJ.ol A,.o Gar den of Eden Surv.y (or CF:A Exp lor a ~ Ion Loopno 0001. Ll". 4700E oo"PO".nt. Hz 00000dary Ch I

(r.qChz.) 26.230

rASh 2783

conduc~.d by

ProJ.cl Ar.a Gar den of Eden

Surv.v for

co.pon.n ~
eRA E>c:p lora\-. Ion Hz col'\dorv Ch I
UTEM SURVEY co"duoled bv PMM DGH Job 8501 PreJ_"\ Areo Gar den of Eden Survey for CrM Exp 1or a l Ion

freqc;. 'Z,)

4500E co.-pone,,"

.econdorv

rASh 2785

. _------------- -----\.

UTEM SURVEY co"duo\ed by PMM DGH Job 8501 P"oJee\ Area Garden of Eden Survey for eRA Exp Ioroll on Loop"o 0001 LIne 4400E COIlP()f"l."\ Hz.eO()f"ldar-y Ct'o

f,.q(t'oz;)

- - - - - - - - - - - - - - - - --. -.

( "~

------"-===============""-""""""11

IS) IS) ~

-sseeN

, ! , I

LAMONTAGNE GEOPHYSICS UTEM SURVEY AREA Loke 80rr Inglon L47eeE Hz t:Ci1PONENT SECONDARY rIEll>

049077

southern ends of the line with the contact appeari~S to be at 4200N. Possible conductors occur at 4150N and 4350N: The former is the deeper of the two but little more can be said as the~ are both ver~ small and the response is close to the noise level. Line 7400E Contacts between rock t~pes are indicated fro~ masnetics at 4290N,4560N and 4710N. A masnetic unit lies between 4290N and 4560N. There is a possibl~ conductor at 4050N but the line does not extend far enouSh tti be sure. It appear~ from the available information that the conductor would in any case be shallow and thus ~eochemistrY should confir~ whether or not it is of interest. Line 7500E Station 4700N on this line is the approximate position of a DIGHEM conductor located on this grid. On the ground this is visible as a conductive feature of about 35 metres width dipping to the south at 70deg. at a depth of 30-50 metres. It is most probably due to a slightly more conductive rock type as the conductivit~ appears to be Guite of Guite a low order. There is a magnetic peak in the centre of the conductor which is due to a soUrce at a depth of 30 metres. An apparent conductor occurs at 42S0N. It dips at a shallow angle to the south and is again interpreted as beinS due to a more conductive rock type. In this case there is some Guestion in m~ mind as to whether the response on the lower freGuenc~ is in fact due to the same feature or whether there is a deeper source as well. Another deeper penetration EM s~stem might be needed to solve this problem. If there is a deeper' source then I feel that it might be from 40-60 metres down but this is Just an intuitive guess. A magnetic low is centred on the same point as the centre of the deeper response. A magnetic contact occurs at 4450N. Line 7600N The 800nT drop in the magnetic response at the northern end of the line indicates the edge of the basalts that lie across the northern edge of the grid. A magnetic unit lies between 4075N and 4300N to the south of which the magnetic response is lower possibly indicatins sediments. The low freGue~c~ response at the southern end of the line is ver~ nois~. indicatins conside~able conductivity variation in the

049078

rocks at some depth. At the surface the higher freQuenc~ indicates that the rocks are Senerallw more conductive than elsewhere. If there is anw sort of seochemical response this ar~a should be considered interesting even thousn there is no well defined conductor. At 4625N there is a small deepish 150-60 metres) conductor wi~h a 150nT magnetic peak on its southern edge. Again the conductor is poorl~ defined and no Quantitative estimates of dip and conductivit~ are possible, though it appears to dip steepl~ to the south. Line 7700N The shallow conductive response of the basalt is becoming visible on this line. The edge of the basalt as interpreted from the magnetics 14875N) and the EM (4650N) is Quite different. I assume that there is a fairl~ broad area of weathered basaltic material.off the edge of the fresh basalt, and that this produces the conductive response when the masnetics show no sign of shallow fresh basalt. At the end of the line at 4925N there is a plunge in the values of both the hish and the low freGuencies as well as th. magnetics. This is interesting thoush I can't explainwhat it is caused b~. Most likel~ it has somethins to do with the basalt but it ma~ be a conductor under thin basaltic material. If no seochemical samplins has been done here it might be worth while. There is a slisht increase in surface conductivit~ and a decrease in the deeper conductivit~south of 4250N. Between 4325N and 4425N there is a unit with a low magnetic siSnature. At 4650N there is a magnetic contact. The background EM response for the whole line is unusuall~ low which indicates Senerall~ hiSh conductivit~. Perhaps this is indicative of a lot of alteration or fracturinS. Line 7800E The edge of the basaltic material appears to be at 4650N from the EM and at 4900N from the maSnetic information. There are masnetic contacts visible a~ 4325N, 46'ON and 4825N where the fresh basalt appears to commence. Possible conductors are present at 4100N, 4225N and 4400N. None of the responses are ~er~ strong and all must be at greater than 30 metres depth. The dips appear to be generallw to the north. I feel that further EM with a more discriminatins s~stem would be necessar~ to determine whether these conductors are real. I do~'t feel nearlw as pleased with the

049079

conductors on this line as I indicated after the first pass. As is often the case, 'the~ looked better the first ti~e Line 7900N The EM and the masnetics aSree Duite well on the postion of the edSe of the basalt on this line, both puttins it at 4700N. At the northern end of this line a DIGHEH conductor was found. Thi"!; is clearl~ on the basalt and is probablY due to it. The low freDuenCY response is somewhat depressed underneath the basalt which maY indicate a rock type chanse as YOU so under the basalt. Other masnetic contacts are present at 4260N and 4400N. A.small conductor lies at 4300N. The source is at a depth of SO metres dippins at 60des. to the north. There is a masnetic low at 4600N which maw correlate with the similar feature on line 7800N. Line 8000N ASain there is a curious disparity between the position of the basalt as determined bY the two techniQues, but this time it is in the opposite direction. The EM resPonse is dominated bw a broad shallow conductor at the edse of the basalt which dips at a shallow anSle to the north. This is probablw related to the base of the basalt. There is a masnetic contact at 4200N. The end of the line is once asain characterised bu a somewhat more anomalous response on the EM, this time solelY on the low freQuency. I would have liked to see the line extend a little further to the south to completelY cover the anomaly in this case, as it appears to be caused by a non-surface source (sreater than 40 metres depth) which misht not produce a stronS geochemical response if it were a small ore body which misht be related to a larSer one at depth. CONCLUSIONS Readins back through this memor~ndum, I find thai I have spent a larse portion of it discussinS the position of the basalt rather than any interestinS responses from the rocks which misht be expected to be the hosts ~or anw ore. This reflects the seneral value of the results. The GENIE swstem is basicallw a cheap, rapid reconnaisance EM tool which finds large anomalies. Unfortunately there do not appear to be m3nw "elephants' lurkiris on the Stonebridse srid that are

049080

PAGE" "5 -,.
in reach of the GENIE. Most of the responses that we ~ve received have been somewhat ambivalent but may be siSnificantly upsraded by even minor seochemical anomalies. If any follow UP work is to be done I recommend ~sinS a more discriminatins, deeper penetrstins, ,1arSe loop sYstem such as UTEM. Problems will arise with cu~rent channelin~ due to the larSe variations' io rock conductiyities - a la Beulah and careful interpretation will be necessary to sort out these spurious anomalies. T. yon Strokirch

.'.' '.

I I I I I I I I I I I I I I I I I I I tl

~;I'~'::'~~'~~'i

049081
STONEBRIDGE LINE 7300E EM

3037 Hz / 112 Hz

4:lOll

:lOllO

METRES

337 Hz / 112 Hz

METRES I"
SHEFFIELD E.L. 7/73 STONEBRIDGE BARITE PROSPECT LINE 7300 IIIf GEME PROFILES

SKSS - J , :5111 T.r;{

REPQflT No.

IJ-"-_

PLAN No. TASh
.=------------------------------------1-------------, 049082
STONEBRIDGE LINE 7400E EM

3fJ37 Hz / 112 Hz

.&100

.&'700

.&IlOO

HETRES

-0.:10

-1.:10

.&200

.uIllO

SHEFRELO E.L. 7/73 STONEBRIOGE BARITE PROSPECT LINE 7400.E GENIE PROFILES ms - J

, :. OMWN

lICALE

AUTHClfl

.;..;.

+-L:M::.:if1!::._~ 1J~.

NIl. !!."':'-.!!.-!!!..J:.::=.:;NII.=-t::;:ASh:::':"---ofUll--J

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049083 -.
STONEBRIDGE BARYTES LINE 7400E
eRA EXPLORATIQIt PTY. LIIIU'iIi)

049084

STONEBRIDGE LINE 7500E EM

HErRES

~~-~ -r--r-,-.---~,.100 ~ ~
--r-""""'"-.---..,.,-.---.,-.--.,-.,.---.-,-'-.-,-.-,-=--.----"
SHEFFIELD E.L. 1/13 STONEBRIDGE BARITE PROSPECT LINE GENIE PROFILES

1 : SIll

REPORT No. T.r.t lJ - ,,- ""

049085

STONEBRIDGE BARYTES LINE 7500E
QltA EXPUJRA1r1Qfll PlY. L1M11S)

049086

STONEBRIDGE LINE 7600E EM
SHEFFIELD E.L. 1/13 GDIE PROFILES

lIEF. SCALE

STONEBRIOGE BARITE PROSPECT LINE 16fHJ _

SKSS - 3

, :. DIlAWN

AUTHOIl

112 Hz
SHEFFIELD EoL 7/73 STONEBRIDGE BARITE PROSPECT LINE 79DD GENIE PROFILES

AUTHClll

SICJS - J

, : 5IJII

PlAN No. TASh

D-"- _

STONEBRIOdE BRRYTES MAGNETICS LINE 7nnr,r

RA EXPLORA:I1ON

"'Yo

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, ,.'41:
I I I I I I I I I I I I I I I I I il I
. '.>~--':-',,;:,."; '.-:

049094

STONEBRIDGE LINE 8000E EM

~100 ~

.&aoo
SHEFFIELD E.L. 1/73 STONEBRIDGE BARITE PROSPECT

LINE 'DOD _

GENIE PROFILES

IEF. SCALE AUTHllR

SICSS - J 1 : SIll

DIlAWH

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STONEBRIDGE 6ARYTES MAGNETICS

NE 8000E

I I I I II I
CRAEXPLORATION PTY. LMITED

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J~ '''' "","""

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STONiBR/DUE PROSPECT

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WEST I1T ROLAfm

MT ROLAND

"1

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ROB' 883

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