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COMMONWEALTH OF AUSTRALIA

~.---------~ --~ ~--------------'

~ t~/;I)(t..? y:.~~ 0$"

DEPARTMENT OF NATIONAL DEVELOPMENT

BUREAU OF MINERAL RESOURCES GEOLOGY AND GEOPHYSICS

RECORDS:

1964/179

BMR PUBUCATIONS COM~AcrUS (NON_LENDiNG-SECl10N)

PROGRESS REPORT ON DIAMONDDRILLiNG,RUlVI JUNGLE AREA 1964

by

C.E. Prichard

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 It may not be published in any form or used in a company prospectus without the permission in writing of the Director, Bureau of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.

,

PROGRESS REPORt ON DIAMOND DRILLING, RUM JUNGLE AREA 1964

by

C.E. Priohard

RECORDS 1964/179

CON'1'ENfS

SUMMARY

INTRODUC!ION

B.M.R. 64-1 B.X.R. 64-2 B ••• R. 64-3 B.M.R. 64-4 B.X.R. 64-5 B.M.R. 64-6 J3.M.R. 64-7

CONCLUSIONS

TABLES

Table 1 Summary of Diamond Drill Holes Rum f\tn&le Area 1964. . "

Appendix 1- Diaaond Drill Logs.

PLATES

1. Leoalit7 Sketoh 2. Plan, Diamond Drill Holes B.M.R. 64-1,64-2, 3. Sectton. Diamond Drill Holes .. .. .. 4. Plan and Seotion Diamond Drill Hole B.M.R. 5. " It It M II "" B.M.R. 6. .. .. .. .. " .. B.M.R.

. "

:)F-fICE

r 1

2

2 2

3 3 3 3

4

64-3, at

64-5. 64 ..... 64-7.

64-4 ..

The information contained in this report haa been obtained by the 'Department of National Deyelop_.nt, as pari of the polioy of the Commonwealth GaY.rna •• t, to assist in the exploration and de~elopm.n~ of a1~eral r.source.. It JI1~ not be publil1hed ill any form or used in a oompany pro.pee-tus without the permission in writing of the Direotor, Bureau of Mineral Resources, Geol0D' and Geophysice.

sum-nARY

Seven diamond drill holes were drilled betwoen June and Ootobor, 1964. Six of these holes tested ~lootromagnetic (Slingram) anomalies and one was sited on a geochemical (oopper) anonaly. The first six holes penetrated amphibolite dolerite or carbonaceous sediments containing pyrite and pyrrhotite but no economic minerali­zation. Radio-activity was low. The hole sited on the geoohemical anomaly of Mt Fitch encountered Cavernous dolond to and Was abr~.ndoned before reaching th~ t~get zone.

Ii7TRODUCTION

The electromagnotic stl.X'veys carried out.in the Rum Jungle Area have dolinoatod a number of anoBalies between Do1erite Ridge and Ut Fitch. (Ashley 1963, Page 4). Six dill holes were sited on these anomalies to determine their cause and see if they roflected economic m:tneraliza­tion.

The copper anomolieo resulting from the geochemical survey in 1963 in the Mt. Fitch Area had been tosted by diamond and porcussion-rotary drill1l'lg (Pri tohard 1964) but

a reinterpretation s~~gested O~ alternative form for some of the anomalies and one drill hole was sited to test tbis interpretation.

Atlantio Drillors Sydney were engaged to drill these hole sunder oontract. One Sullivan 12]3 diamond drill fitted with a Perkins diosel engino was used. Drilling cOT:2menced in mid-June, 1964, and was cO:1lploted 0.71 13th October, 1964~ -Seven holos totaliing 2106 feet were drilled a.nd core rocovery averaied 95S~.

Table 1 sum'>1arioes informa.tion about the holes drilled.

tJo.

D.r1.R •. 64-1

B.IJ.R. 64-2

B .. U.R. 64-3

JabD.R. 64-4

B .. Ii2.R. 64-5

" 13.m.H. 64-6

::J"U~ll. 64-7

TABLE 1 .

SUMmARY OF DIA00ND DRILL HOLES

ROM JUNGLE AREA, 1964

Collar Azimuth Dapr06sion Co-ordInates

382.75N 135.70E VertiooJ. r1t. Fitch No.2 Grid.

383N 129.5E Vertioal Wt. Fitch No.1 Grid.

370lQ 12713:. VerticD.J. Ut. Fi ten I~o.1 Crid.

370.75IQ 143. SOE - Vertical rut. Pitch Ho.2 Grid.

432N 116.5E 145() (Mo.g.) 70° l11t. Fitch No.1 Grid.

318H 133E Grid E. 55° r;It. Fitch Ho.1 (87°sag. ) Grid.

66W 168n Grid E. 55° Dolorita Ridge (500 Mt\g.) Grid.

Length Terget

300 f0et Geophyoical AnooBly

254 t 6f! Gaophyoical Anoma1y

290' 6n Gooph.vs1cal Ano[l.aly

324'9 tt Geophysioal luloQaly

229 foot Gecohemieo.~ . (au) Anomaly

354 foot Geophysical Ano:oaly

354 feet Goophysioal AlnOill.@ly.

,

'f

2.

B.fVi,R. 64-1. (Plates 2 and, 3)

The first hole to be drilled is sited on an alluvial flat immediately south of the East Finniss River. The only outcropping rooks form a ridge of Acacia Gap quartz gre~aoke about 200 feet west of the site. These beds strike 340 and dip 550 west. Auger drilling during 1963 (Pritchard 196-. ,Ref) , provides information on the distribution of Golden D,yke Formation and Coomalie Dolomite. '

The hole is sited onthe axis of a olearly defined Slingra,m anomaly and is wi thin the limits of a magnetic anomaly {Ref. Ashley 1963 Page 5}. Immediately below alluvium it entered amphibolite and continued in this rook for full depth of 300 feet. The amphibolite is strongly pyritic throughout (average abou:tJ 10~); possibly pyrrhotite and chalcopyrite are also present. (Assay results not yet available).

The pyritic amphibolite is probably the Cause for the electromagnetio anomaly. If it 1s of sufficient extent it could also account for the magnetic ano~aly. The anomalies are not associated with economic mineralization.

B.m.R. 64-2. (Plates 2 and 3)

.This hOle is aleo collared on alluvium south of the East Finniss River but is located about 200 feet west of the ridge of AcaoiaGap quartz greywacke, i. e. 600 feet west of B.~·~.R. 64-1. Apart from the ridge, there is no outcrop and no geological information from auger drilling. Golden D,yke Formation would be expeoted here.

Again the. hole is sited on the axis of a slingram ano~naly, and is within a magnotio anomaly.

Blaok slates of the Golden D,yke Formation were penetrated from below the soil to 81 feet, then amphibolite to 211 feet, then blaok slate and dolomitio calcilutite to full depth of 254'6". All the rooks are pyritio but the amphibolite isXichly pyritic (over 20%) from a depth of 135 feet' to 211 feet. This is the likely cause for the e1ectr6~agnet~c anomaly.

There is no indioation of economiomineralization.

B.M.R. 64-3. (Plates 2 and 3)

Thirteen hundred feet south of B.D.R. 64-2 8nd almost one thousand feet west of the ridge of Acaoia Gap is B.LI.R. 64-3. This hole is sited on an eleotromagnetic anomaly west of and roughly parallel to that tested by H.w.R. 64-2~t is also within B magnetic anomaly. There is no outorop nor'i~B~face geological information available in the Vicinity. Golden D.yke Formation would be expected.

Carbonaceous and ohloritic beds were penetrated to 272'6" and then 'calcareous beds to full depth of 290 1 6". Amphibolite was present from 246 1 to 246'6" & 265'6" to 269 1

• Pyrite.±a present throughout up to 15% and is usually accompanied by pyrrhotite.

The sulphide minerals present probably caUse the eleotromagnetic anomaly. If pyrrhotite beoomes more common at depth it could Cause the magnetic anomaly.

B.X.li. 64-4·. (Plates 2 and,>

B.M.R. 64-4 is collared abou~ 1400 feet south-east of B •. M.R. 64-1. It is sited &n the axis of the same electromagnetic anomaly which has been displaeed by M' . outh-westerly s1rikliig fault bet,ween the twe holes. It is '. ',8e to the axis ,of a magnetic anomaly about tbree times the 1ntensi y of those a1 B.M~R. 64-1, 2 and 3,., Amphibolite was penetrated from under theso:il to :tUl.l depth sf 324 feet 9 inches. Pyrrhot1 t. is more QommGn th&n. pyrite and these two minerals exceed 10% throughou.t the amph:iboll:ts. ·No economic mineralization was apparent.

fae pyrrhotite probably accounts for the magnetic anomaly and together with pyrite would cause the S1ingram anomaly.

B.M.R. 64-5. (Plate 4)

!his hole is sited to test at a vertical aepth.of 400 feet a copper anomalY' located by the 1963 Geochemical Party-

!fhe hole is collared at 432lf 116.5:& (Mt. Fiteh No.1 Grid.) and depressed at 70° on a bearing of 1450 magnetic.

Incohesive sandy soil wa.s drilled. to 160 feet when the Ceomalie Dola:m11ie Was entered.:. hem 1-60 feet to 229 feet where drilling WaS s'jjQPped e.avernous dolo1Di te was present. Cavi ties intarseeted t(rtall-ed a.lmost halt' the total distanc-e advanced. ana rendered further drilling lUteeenomie.

!he 1;arge~ sone was net tested; n.o copper mineralization was recognized in the cere recovered.

B.M.R. 64-6. (Plate 5)

Bol.. B.M.R. 54-' is collared on the edge 0! a. pa~er bark swamp in.. an area of no outcrop a.bou1i 3000 feet south-wes'i of Mi. :Burton opencu't. It is 8i ted on the axis of an el.ee~­magnetic anomaly and was designed to test it at a vertiea.l. depth of about 150 feet. The target zone is within a magnetic anom.aly of madera1ie intensit7.

After peaetrating 60 feet of alluvium the hole was in Golden. Dyke Formation sediments to 122 fee"t; toleri W to 100 fee"t, Golden Dyke to 188 feet. dolerite to 200 feet and. Golden Dyke sediments to full depth of 354 feet. The rocks are pyri tie throughout but net exceeding 5% in the first 200 feet and r.' ~illg to 10% in the deeper part or the hole. Pyrrhoti. te exeaed 5% in parts of the core. No copper or other economic minera.lisation was presen",".

!he electromagnet1.e anema1y is poss1bl' caused by carbona.ceous black slate earry-ing ~e pyri1ie which occurs between 160 ancl 188 feet and again between 300 alld 236 feet. !he magnetic anomaly may be due to the dolen'Se (122-160 feet 8lld 188-200 feet) or to p~rrho~ite which occurs frem 280 feet to the end of the hole, particularly if the percentage of tilis mineral increa.ses in depth.

:a. M. R. 64-7. (Plate 6)

Hole B.M.R. 64-7 is sited on an area of alluvium east of the J.i'inniss RiTer aboll" 3500 feet south of Mt. Burton openeut. It is nQrth of 'the end Qf Dol;er:tte Ridge but there is no outcrop in the immediate vioinity. ~ hole waB.delpi.gned to ~es" an electro­magneTic anomaly at a. vertical. depth of abou1; 200 feet. This area is again within a magnetic anomaly of moderate intensi~y.

4.

After penetrating 68 feet of alluvium the hole was in dolerite to 155 feet then Golden D,yke Formation sediments chiefly black slate to 290 feet and then in dolerite to completed depth of 354 feet. The dolerite is pyritic up to 5% and the sediments to 10%. ,Pyrrhotite is pre'sent but subsidiary. No economic mineralization was present.

~he pyritic black slate is a possible Cause for the electromagnetic anomaly 0 The magnetic anomaly at this site apPQars to be c~uaQd by the dolerite or a body at greater depth than penetrated by the drill.

CONCLUSIONS

Radioactivity was low in all holes probed, except for B.M.R. 64-6 where values exceedin.g 0.06 mR/Hr were recorded. (Core from this hole will be split and tested for radioactivity and fraction sent to Canberra for spectrographic check for economic minera+ization}o

In general there is good correlation between Resistance, Radioactivity, and lithological logs. Dolerite and black slate both have low resistance but the black slate has higher radio­activit yo Calcareous sediments have high resistance and low radioactivity_ Amphibolite generally tends to be more variable than any of the other lithologies.

In general s~phide~ mineralization is present in sufficient concentra~ion to cause the electromagnetic anomalies. The magnetic anomalies are deeper seated and have not been ' adequately investigated. The presence of pyrrhotite and its greater concentration in B.M.R. 64-4 above the most intense magnetic anomaly suggest it is a major contributing factor but it may not be the sole cause of the magnetic anomalies.

Mineralization of economic grade WaS not recognized in the core.

,.,

•

5.

REFERENCES

ASHLEY, J., 1963

PRITCHARD, P. rJ •. ,

Gaop~vsioal survey in tho Rum Ju.nele District noT. . (B.~:i.H. Record - being odited).

(Por Quger baaed goology around . B.E.ll. 64-1 and 64-4 - '."I:1t10 not GWBilable).

,

BUREAU OF MINERAL RESOURCES. GEOLOGY AND GEOPHYSICS r

GEOLOGICAL DRILL ,tOG OF HOLE PROJECT, RlIl!'1, ~({N~J.~, .. , , . ' , , , ' . , , , .... ' .. , , ' , .. , . , , . , , REMARKS, ,~s:-+~ .I!.~!t. f"«~7"e!~ , /'~~~~Iy , , ' , , " , , HOLE No, • 8 Mil. . ~.4 ,-t. ' , , , , , . , .. CO-ORDINATES .3&Z·7s"~/JS"-.TPt:. . (~I; ,,&;;t~, , ,o,~ ,~",t¥).L.GROUND •. ' ... , , ... , , . , ,,' , , , • , , " "

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~-.-----------------------~-----------------------------------BUREAU OF IAINERAL RESOURCES, GEOLOGY AND GEOPHYSICS

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r----------------------------------------BUREAU OF MINERAL RESOURCES, GEOLOGY AND GEOPHYSICS

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