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DEPARTMENT OF NATIONAL DEVELOPMENT.

BUREAU OF MINERAL RESOURCES

GEOLOG)} rAN~D. : GEOPHYSICS. ~~IT~(gF.D,' ,ij

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SUMMARY OF GEOLOGICAL AND GEOCHEMICAL INVESTIGATIONS RUM JUNGLE AREA. - 1964. --------------,---,-------

by

J.F. Ivanae

The information contained in this report has been obtained by the Department of National Development, as part of the policy of the Common­wealth Government, to assist in the exploration and development of mineral resources. ·It may not be published in any form or used in a company prospectus without the permission in writing of the Director, Bureau of Mineral Resources, Geology and Geophysics.

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SUMMARY OF GEOLOGICAL AND GEOClIEMICiIL INVES'I'IGATIONS,

RUM JUNGLE AREA - 1964

by

J.F. Ivanao

Records 1964/162.

SUMMARY

INTRODUCTION

GEOCrmuCAL SAMPLING

Rum Jungle East Area

Rum Jungle Triangle

DIAMOND DRILLING

RECOMMENDATIONS };I"OR FUTURE PROGRAMME

CONCLUSION

AP.i:'ENDIX I & Diamond Drill Logs - 1964

APPENDIX II I Proposed Diamond Drilling Programme at Area 55.

PLATES'

Plate 1 • Looality map showing Geoohemioal and Geophysioal Surveys to 30th Ootober, 1964.

Pla.te 2 a Generalized Geologioal Map of Rum Jungle East and Rum Jungle Triangle.

Plate 3 Rum Jungle Triangle - Geochemioal Anomaly.

Plate 4 Area 55 - Geology

Plate 5 I Area 55 Geoohemioal Anomalies and Radioaotivity

Plate 6 I Area 55 - Geophysioal Anomalies

The information oontained in this report haa been obtained by the Department of National Development, as part of the policy of the Commonwealth Government, to assist in the exploration and development of mineral resources. It may not be published in any form or used, in a company prospectus without the permission in writing of the Direotor, Bureau of Mineral Resources, Geology and Geophysics.

."

· ..

SUMMARY

During 1964 geoohemical reconnaissance and geological mapp­ing of the Rum Jungle East area and semi-detailed geologioal mapping and geoohemioal sampling of the Rum Jungle Triangle area were com­pleted. Complete results have not been reoeived but those available point to a oopper-cobalt-zinc anomaly in the Rum Jungle Triangle and low order copper anomalies in the Rum Jungle East area. Galena and sphalerite were observed as blebs in Coomalie Dolomite in the Bum Jungle East area.

Diamond drilling to test magnetic and electromagnetio anom­alies intersected only pyrrhotite-pyrite bearing amphibolite and pyritio shales.

A programme for 1965 is suggested.

INTRODUCTION

During 1964 the Bureau of Mineral Resources continued its programme of geological, geochemical and geophysical surveys in the Rum Jungle area. The work was oarried out by geologists and geo­physicists of the Darwin Uranium Group.

The areas examined are styled.- Rum Jungle East (Plate 1) on the eastern margin of the Rum Jungle Complex; and Rum Jungle Triangle between Giant's Reef and Mt. Fitoh faults. Diamond drilling was carried out in the Mt. Fitch - Mt. Burton areas. Geophysical surveys were coordinated with geologioal and geochemical surveys and both used the same traverse lines which were laid out by a contraot surveyor.

Auger drilling and diamond drilling contraots were both won by Atlantic Drillers, of Sydney. Auger drilling footage totalled 49,960 feet, and diamond drilling ~feet 't" YilC 64 •

..2Jlofo Auger cuttings collected from the sOirweathered rook inter­

faoe are being analysed spectrographically by Australian Mineral Development Laboratories for copper, lead, zino, oobalt, nickel and molybdenum. Auger holes were probed radiometrically, readings being taken at intervals of one foot down each hole.

GEOCHEMICAL SAMPLING/AUGER DRILLING

Rum Jungle East Area

The Rum Jungle East area extends from the Giant's Reef fault to approximately three miles south of the Batohelor Road -Stuart Highway junction. Golden Dyke Formation and Coomalie Dolomite

. crop out in the area.

One thousand three hundred and ninety eight holes averaging 13.6 feet deep were drilled on 200 foot centres along traverse lines spaced 2400 feet apart. The holes were probed radiometrioally and slingram electromagnetio surveys were made over the same travorse lines. .

The subsurface geology generally confirms the previOUS sur­face mapping but outlines it in more detail. The Golden Dyke Form­ation consists of medium to fine grey siltstone with minor disseminated sulphide minerals. Rare lenses of impure limestone and black carbon­aoeous shales were recorded. Sulphides-pyrite and possibly galena­were identified in vein quartz in cuttings froin a drill hole at 182N 112E. Galena and sphalerite were identified in Coomalie Dolomite at grid ooordinate 31~5805W and occur as isolated blebs.

F

....

2.

Geochemical results received to date show irregular low­order anomalies centred near 4568. Copper ranges in value up to 500 p.p.m.; (preliminary statistical analysis shows that values above 80 p.p.m. could be anomalous). Lead, zinc, cobalt and nickel values show a broadly similar distribution and spread across the contact of the Coomalie Dolomite and the Golden Dyke Formation.

---- --------,

Radiometric probing did not reveal significant anomalous radioactivity although an area of 2 x background has been outlined between 312 and 336S. A peak of moderate intensity .060 mR.H near the contact between Golden Dyke and Coomalie Dolomite on traverse 408S is the most likely prospect. This radiometric high was recorded on a previous airborne radiometric survey. Further examination of radiometric results is in progress. Well defined electromagnetic anomAlies betwsm 328· 6.nd 4325 bave been discovered.

Rum Jungle Triangle

In the Rum Jungle Triangle the survey grid "Tas laid out at 400 foot intervals with auger holes drilled on 200 foot centres. T\vo thousand two hundred and sixty eight holes averaging 13.6 feet deep were drilled.

Geological mapping has established in detail the Coomalie Dolomite - Golden Dyke Formation contact which trends north in the southern half of the area mapped. Golden Dyke Formation consists of black carbonaceous and chloritic. shales, laminated shales, greywacke and quartz-sericite schist. Coomalie Dolomite includes coarse textured white to pink carbonate and medium to fine dark grey calciluti te ",ith lenses of black shale. Calcilute is speckled with pyrite in many places.

Geochemical results to date show several interesting copper, ,cobalt, and zinc anomalies (Plates 2 and 3) the most important extending from 102N to 198N with the long axis along 110E. Copper results range up to 1000 p.p.m., zinc up to 3000 p.p.m. and cobalt 500 p.p.m. The anomaly is 2600 feet long and approximately 400 feet wide and lies ll1 a slight embayment in the contact between Coomalie Dolomite and Golden Dyke Formation. A narrow zinc anomaly parallels this anomaly, 800 feet to the west. A.M.D.L. have been requested to expedite ru1alysis of the remainde~r of the samples. The zinc anomaly is of interest ru1Q is the first confirmed case of zinc being detected in anomalous quantities in the Hundred of Goyder. The other anomalous zones are associated with changes of strike of the Golden D,yke Formation Coomalie Dolomite Contact.

Radiometric results 1-Tere disappointing and the highest value recorded was 0.124 mR/hr near the contact of Golden D,yke/Coomalie Dolomite. Four auger holes were drilled at 100 feet - N.S.E. and "T. of the high value­to depths of 35 to 41 feet but the highest radiometric reading Has .035 rnR./hr. Further examination of the results is in progress.

~JAMOND DRILLING (Appendix 1)

A programme of 2106 feet of diamond drilling to test electro­magnetiC anomalies coinciding with magnetic anomalies was completed. Holes 1, 2 and 4 passed into pyrite-pyrrhotite bearing amphibolite, pyritic slate and dolomite. Hole 3 intersected pyritiC slates and greyvracke ,'Tith minor amphibolite bands; Hole 6 intersected pyritic sediments and dolerite; Hole 7 intersected carbonaceous slates and dolerite.

The pyrite content ranges up to 20% and occurs in veinlets, blebs and disseminated particles throughout the complete length of core.

Core is being split for detailed spectrographic analysis and selected sections will be analysed for gold and silver. Mineragraphic studies of core will also be made.

Magnetic and electromaoonetic anomalies appear to be accounted for by pyrrhotite and pyrite.

~t Mt. Fitoh D.D.H.64-5 was drilled to test a copper geo­chemical anomaly in the sulphide zone but was abandoned at 229 feet because of bad drilling conditions.

RECOMMENDATIONS FOR FUTURE PROGRAMME

i4 suggested programme to be carried at Rum Jungle by the Darwin Uranium Group in 1965 is as follows •

1. Continue to compile and collate at uniform scale all existing info:rmation on the Hundred of Goyder and con­tinue detailed geological mapping on selected sheets of the agreed grid layout.

2. Geochemical sampling to follow-up anomalies discovered during 1964 - 20,000 feet (maximum) using B.M.R. Gemco rig.

3.

Rum Jungle Triangle - close up grid on copper-cobalt­ru.no anomaly and· supplement by deep profile sampling to maximum depth of BMR Gamcodrill. Ten thousand feet of drilling is planned.

Rum Jungle EaRt - Ten thousand feet auger drilling sampl­ing supplemented by mattook samples -in residual soila­to follow up anomalous zones. The B.M.R. Gemoodrill will be used for this work also.

Reconnaissance Sampling - South of Gould Airfield and Water­house No. 4 prospeot area, if time permits. Sample points to be looated on airphotographs.

Diamond Drilling - (1) Emphasis is to be placed on drill­ing for infoxmation to assist further prospeoting and will provide support for Item 2 above. In both areas studied in 1964, 2000 feet of drilling planned to test I

(a) geologioal sucoession beneath geoohemical anomalies.

(b) geophysical anomalies

(2) Area 55 (Plates 4,5,6) A minimum of 2400 feet and a maximum of 3950 feet is reoommended to test targets outlined at Area 55. A.ppendix 2 lists the proposals in detail.

Other Suggestions

Mt. Fitch - 150 feet - one hole (112E, 136N) to test eulphide zone at right angles to strike of geochemioal 1000 p.p.m. copper contour.

Follow-up Tamblyn's Shaft copper prospect - pattern air­blast rotary - percussion would be suitable to check for oxidised oopper ores.

Surveying

An estimate of oontract stl.rvey requirements will be made as soon as the oomplete geoohemical results have been assessed.

--

APPENDIX, I

DIAMOND DRILL LOGS

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ORILL NO" •• , •• , ••• ".,.·," . III TYPE ..... , • , .. ,', , ..... , ." CASING IN HOLE DURING ORI~~\NG PI

.-97

--

--. 91

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EXPL.ANATION

~------------~------~---~--~--------------------~~-------~----------------~~ DRILLER", .... ,~ , , . , .• ,' •• "

. REFERENCE~

COM~ENCED, , .... , , , , 0" , , , ...

COMPUTED, . : ,. ,'; • , ' .. , , , , , ,

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-

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HEAD OFFICE

LOGGEO BY . ~4.~' .... ,'. ORAWN BY ,~~ ...... . CHECKED BY

SHEET" •.•• '" ~., ••• "

ORAWING NO"","",., •.

Hole •... -

A

C.

D.

E.

F.

G.

H.

-, ...... , .....

Co-ordinates· Easting Northing

. 1330W 2008

1440W 4458

1440W 6108

1440W 9008

1100W 5008

1100W 6455

550W 3008

651W 9008

Depth (Feet).

350

600

850'

550'

550'

500

350

200

* DRILLING RECOMMENDED AT AREA 55 • APPENDIX II. .....•.

Priority Comments •

1 ... (1) To test·the most<i:ntense electromagnetic anomaly; almost ·down the plunge -of··l-ineati-.n· 2 from the peak of the geochemical copper anomaly at 1200W, 4008.

2 (1) To test the suspected extension of the mineralization in the syncline between anticlines 1 and 2 wi thin the electPOmagnetic anomaly downplunge from the geochemical anomaly.

3

3

1

2

1

4

(2) To be continued into limestone even if lead mineralization is encountered in the upper part of the chlorite-schist unit.

(1) To test the suspected extension of the mineralization within the electromagnetic ~omaly.

(2) To test the downplunge extension of any mineralization intersected in DDE or DDF.

(1) To test the extension of the mineralization within the electromagnetic anomaly dONn­pl\h~ge from the peak of the lead anomaly.

(2) To test the suspected shear zone on the southern limb of anticline 2.

(1) To test the inferred mineralised shear zone downplunge from the peak of the copper ore-

( ) bodY, in the vioini ~y Qf th~ 10' of 1 f4% copper encountered in DDA 3.

2 To test the Coomal~e DolomIte near tne She~ zone.

(1j Follow up from DDE. . (2 To tesr the inferred mineralised shear zone. (3 To probe for an extension of the inferred major shear zone intersected in DD101 and DD708.

(1) To test the tail of the geoohemioal anomaly. (2) To test the extension of the suspected mineralised shear zone. (3) To probe for muscovite schist and examine its contact with the overlying limeston3.

( 1) To examine the number2geospbysical anomaly. (See sectionXX1).

* From "Area 55, Rum Jungle, N.T. by P.W. Pritchard.

o • o •• 0.0 •••• o •• 0 •• 0 • 00 ••

... :::::::: is:::::::::::::::::::::::::::::: : : : : : : : : : : : ~ : : : : :.I~"': : : : : : : : : : : : : : : : : : : : :

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: : : : :I~ : : : :2'0~: : : :ff~: \ : ~~: : : : : ~: : : : :~~ : : : RUM JUNGLE TRIANGLE GEOCHEMICAL ANOMALY

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