department of national development bureau of … › 9160 › rec1953_143.pdf4· . ".ii: i...
TRANSCRIPT
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COMMONWEALTH OF AUSTRALIA
DEPARTMENT OF NATIONAL DEVELOPMENT
BUREAU OF MINERAL RESOURCES GEOLOGY AND GEOPHYSICS
RECORDS:
1953/143 NON· LENDING CIPf
NOT TO BE R ....
FROM LIBRARY
PRELIMINARY REPOl:~T ON DIAMOND D1ULLING AT THE BRODRIBB
PROSPECT, NORTHERN TERRITORY.
by
D • N. S])J~I TH •
i \ , U
The information contained in this report has been obtained by the Department of National Development, as pa~ of the policy of the Commonwealth Government, to assis~· in the exploration and development of mineral resources. It· may not be p'ublished 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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... . .. ~.o.·$pec.1me~Q .b!.: om bOl.' .. l"N.· QJA.S404 :"om 2. Jlfee. (bQ1'81.~.b)aa4 No. A540,' f~om 2,6 teft (\)01'$ l~tb) W," $ant .~o ()anb.,,~afOl" m~el'a~bJ.Q: wo~ ~'WM.iaobU.$' ~epQ.P~~ a. tQl1qWS$~- .' '
, . "Sp,o\ril$ll A5404 1@ a ht8bl.1t'1'.rug~o.u.e 'e~dys~l. ~th el11~ltl~d bands aJ,Qng wb.,lob ~b, lp.a~ mUlel'al1za_t.Qn ' appear$ to. bayeCakf,tnp:l,a.Q. "
$peoimea.A!i405 ~$a g;(f)7b~d~4$,lat& wl'lta *" , '4d,b~d o.t' l}YII',tte l'apla~1N on~ ~:r $be ·l~gbO~~ #f#f llan4$'
~l'aO~UD of py"S,. te mlDOl'$l,t~a,~oll' ooour 'p~t41$1~O '"as, . ~8l\4' as' .EJma~l o,~c\lla.f a('eB$ u.p~o *" dlametGl' ana. of Jl,gi,i8~bl. thlckn"ss'. Some of'he$a $how p8il!tlal b'CiJakdownto 11monlt$.
'h. o~e m1;nepa),s. ,p~'$eu.', ~ ~ho two. sp.o1rnensar. PP1. ~e. PY.r"ho~lt •• Berna'l~e an.4 L'lm~~". T~e" Purl', oco~. a~ el1tu~4I'al, o"Sl't81s 8#4 $$ 11'"egular al'ea~l.tb, a, sta'lli$ize Up to Q., om. aC~f3e. itn Pllil'~~ 1~ i.e "a • .,.t,rlDs '0 ,ltmonl~Eh T~ ~l1hod»a:L" cl'N'S~als OC~t:U' In.,, a flnely ~o1!'U$'~llne iron oltl4:e (Iltma~l,e .~ GO.~b.lt~) wblQ~ 8~Qwa fl rIl$41~ .~le9tl'OP'''. , 'l'b.es$~"Y$tals h$v~ the.I)'-"! ~,()h$@9n faco.l1 dGyelope4 tn. many gase., th.J'flfo," ~h$7MG. p,tiOb8b1~ tb,~Q.r"g"nal ·t;)~Y'8talf ~d ,ne> $ l'eplelQem~~ Qt an oal"11ep tOi'metl ndh.el'al,~ "
, ..
~Yr£~'tt. S.S prGsen t 8e velJ'1 small l~l'egtil.a,r Lll'ei$ ,Up ~o 0.1 'un.,engab to. ~b.e PUl'~t~, and ,~a n~.tlceabl,G tov lt~ et1'o1\8 ~lso~roplem ~d pleoclwQlem~ Ita" It&lotlQneb19 to, the pyrlte 1s obse~e. ' ,
T~.I_ltll' (~. la.t~~"') ,9CC~$ 9Q peetldomoJ'pbe af'.l.'llagn~ t~ t,$,W ~ C,flt@ enolQ$ed .1n. PUl"~ t~, (spec. A5405 r. qd. $$ l.aJ'S$ l~,ltegu.l,arf.U'.as ~,hlOh '~p;o10,$(i) 'tb~' CJ:'y.$tal$ ot pyX'l t. (~P'c. A5!t(4) ~ 'J!he ou.n~l'$1,~e npt, puce, l31.l~ show$ $Cages ~n tb.~ 1)". ~ak4Q •.• ~. ~l.,'in911.,. ,1'0. ,laO.,b. .. lns m,.th Stl.'.OlL. 2P .. ~u~ , lIOl dal'ltene some aJ-ess ,ot th. crYstals d~v$~oplng a mo'~;J.ed t$$,~e. W~e",e areS$ T'b~c~ ~~"w~ ~b '.tcb1Jl$ ,aPe pl'qbablLt . ·t~ b:vcLt'a O'1t(i Q~S,4$ Goa $b~~. i ~~u,6h~w. a. ,BlPdel'Q t~ $D.1S9 ~l'()pl_. ~he $l"eas whiohl'elllaf.nUllatf$ot,C!ii b,. etQhlng ehQw a, '.",'Coy S -.s . • 1$O,tJ'OP~SUl" and. ,haye eM ,C~fl()~ .. ,teti.~$ ,Qt Herna'l.~. .'.rll' , , ,acf$ that th~ trOll o~ld~ ~, on.e oae~, la~~qlQ$edb, ~'''~t.e, aM 1n anQ thel' C$S$ is enolO$~q' tb,~'. Pp~ tet WO\\ld. $~e, t, . that"! . th~ m~e tl te was d$pOe,ltq4, ft.J'~.J .th"ewae '0110we4 bV PY1'1te WhlcbwafiJ tol1oWf(lln tutu: b, pp~ b$IDatt.'e,.
. .Wh,e _e mSAe»al p~es.tt.e~, wbioh '009m''' j in l~ge 1.r~Sll~ 1l 8»es,sj end lA" .f~p~C)im~4 8ppe8l'S~o '~ l'EJP:taolllg Hematlte~. tt· , ".
, " .in, _h.~ eumma!W' ot: ttl. seolQgtoal logS.tM 0~J' SU.,lph~~ei'efOl'red.to $,8 p11'S.~Q~ . Bo~oV~~' ae liIhQwn u.,. W.J4.B. aol;)t)~ta' m1n~a~spb.lo »epo"t. ttPJ£'Il'ho tl ~e 1~ pr9$.~. t;ls
Very small ~~,!,egula.l' a,.oe.$~P t.o ChOiL 1iJrl •.. ,~.l<;Jng'h tntb.e. pyrl,ott. . It must, thenb. aasum.ed attb.l$$tag~ ,t~t pY~l'hQt~,'o occ\U's wt\&l'O ~V't .p;r.rs.~Ghae 'b,en.,,~oo~,a;.
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..' I" ',,' ,;A1.tb.c;)1lS~ :t~ l1~sU).,ts, ~e, all, PQor ~eJ, th.e ~iuc1.lJe assays 1ndloat$d., '1~ ,,$', ~Jl •• l'~stUlg to ~Qt~ 'b,a't. thG-l'G' oan ~. Gome oO.tt.pel.at.t~:rt b.~we~, g~O~QiJ'f' 'slu4ge $$$ay; and ~ad~om$tr,J.O ,19Sgs.ng~, F~ .. , ~ tian.c~h ,1n bope holes' Bl~B.3,B4 8 s;LlghC
, , 'lU4.~~l~:_S' i1eQo~a."d :~t, @O 'tiQ 100't't1iet, in 1l1,,20 ,to 40 in ~a,and, 40"0 ,60 ~~;,~4~
. ; '. : ' , , . . i , Strl,$11as' ~ll$" '"u.~. ,t~i;,$ 'oon.ald~~~ ,~t teeU1ts Qtt,
I$~sntfloan.~. '$~O' ,~, '3: ana n4 '1lc;;1 ~ocqrapp»oJ;~Uf.at$ly wb,,,,. , ~M. drill hole tll-st, Ul,er'$,Q~. t~ W8S:V quait,~: zone.
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,"SiL~~e' $am.P1Qe w.r.QQliec~ec! ~t' tlve. 'teet ln~ervaJ.e. , 'and ~he i1r110.4 :stunplE)s "",re .en.".~9'~,r.t'~t()"t Ente"p~ll,sPt'. . ~ ~d~ 'i Ru.n Jun,g).e, for "ad"Qfil •. t»lc$.Eu~ay.· The slu,a.g,~e q~t~u'ed llJ"a .ep,O.~a3., qu.$r~~r~ de'Vleo. Qllly Ql\e quattep
. tielag l;fPO fQ~,\1i'~l~ J1$$q",Tht? r-$.~1n,iq tb»e.f ql181'ti'#, '~eretu.rne4 to ,'M., B~eautol.' ,,~o,,*., la., .()8Se "f'~the..l' :~",$.u.w •.
", ,.uo~ a~ ~hem$Oal., aS~EW~DS.l~ warr~t$c1~ '~ " . ' : , . • ., r .' I , '" '
, . ".' ,',' "A ·el\lClg",eamp~~. 'W&$. 'takODt, ·"~n·. ten', fe.iCi: t,,·om, .~30 . feet to40.',t~eO, ~: 'ho3-.$,· .a1 and,$~t· eta t~~ .'u.n~$ D«tpa.rtrne~' A~"Q~, $·P~·1ng$, tQ1/SQ%4 "a~$$Y .. :'t)l~' at the ~~me'of ~t.tt.ng no .... ·'$~l.~sb.aye· colne to ,b.atu\ •. :,' . . .
'. ~ .' ' . 8:1nq~ ,the slua.so a$~ay ~esU1'ebavo, senoral~1' b~~n. 1.(:1.8 ·~banO •. Ql~ (t, u.;o~, 1 t b.a~ n()' ~e~ neces.u.Y, toe~ awsJ" spltl Q·Q.fe Q8mP.l$6 ,for, cheu;\lo~ Q~1'$dt.OlZl(l·~f.1Qas$ay.
, $pl1t ool'e samples had tQ·bv. taken t)'oml.90 to,. tQ .300 gee' ,in hole laG,. becan" there was ~o '1;"e t~. of water dlarln,g' t~ 'las.t l1Q, ~$e' of4»1.11tns~ ". " .
~ t. wastOtmdneOese~.:··tQ I dci :G~l~Or ~d sc~nt1119Dltt'" WG~k at tM'base '¢aIl1p, t~ a"Qld, th~ baCk. :~ounct et'tec~ of ~h. $urfaQ8 ll'U:i~erla:L a' the PrQ$~~O~, 1t&elf~ .
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. PZ'ei:lm~UYf~$J..4 .6SSa,e Vi~~~ qew"te4 ¢~'by X.A.. . Mwntnea t.Br,O(lrl\)b,b".Ithe tin.). ttold assay. wete de '.l'Iill.l1oc1; ~U _b.. l'a«\01!1eO.rlc s~o.tt¢~, 01. We:rJ.'~ tOl"Y 2n~Qrpl'\ •• $ PW·t..td.; a~' lum..Ju.nsl,. " :.: .,', ". :.',
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. ... '.. . . G~'''alljy' . the $EJeay .roSUl Cs have _een iese than O!tO)'_ e ~308' bu·t; ~abl.o: ,1)1 lndlcat'$ ~e" ~aaloaotl.1t7 -... 4~t~dte4 In ·,aQhbQzae 11()1$... . .
' .. '. ,i~, ~~tUQm.t~"~Q ·lQgg~ape.~, ',b.roa~l" ""'Ch )ho .,l\1dSe· EU1S$Y$ ~t1"1 ~ .haar beell .b,Q.t~~, bhe pa,r'1o\1la,r.,' . ,rQok typ~ 'Qcm.celm'a ':~s the Vu8EW q\i~'~' W:ld.' q~~~~1 to 't>(;J:L.t~ .
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. '. ". '~ne ~i1.l. b.~.le lnte~eeQ,iQll~ 'of thIs 'zone euga$st ~~aCl~c'n~saway't'o t~, sQl1tb.·' '.' . . ." '. , ' .. ~
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(ll$~pp()tn~·1n.g· M4 no' p~~y UI;t~"t1In. m.U1$l'al;lea'l.Qn of ·.lmpor.anc$ .~. briea J.Qqa ~". ' . .
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" '.' .~a.;t. J)Qs~'b,l,J:l, t,1$8 ~.l,oQa,~g aPD1~;vmtne.ral~· 1~a'lcm·M.vo' ·1)'IIm. e~b$uet.a, \)V· tA._ 41.$IlQnd 4,f11J.:11~. \1\\, 1~. has' been ',ugso~"~ th~:~:~~e'd»ll,~l1n8 mayh.a.ve ·paG~ed. ,c)9DlPl".J¥,·~~~ a,Dl~'1$~.'z'd' 'bQr,l2;QJI"Whloll: ,at' pl'eaen_ ,. 1'8p·,are ... nto4 :b7the almo.~ .~Qdea. OtlCo1,"OP Of ~h<, :$~o11na1
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.' PCW'lon of a .~a.fto~4.~ It.$,'~usll~ ·.~b,at tl'ile d.r1l8to1d
. '~$.$~e4 ~ t.h.' .•. *,e~lm_~ .• ~1~.~.:41'.l"eS'($~~7 tlort.b..,tJ.'om. ~h. nopth.rn 'flank Qt· th.a,*,~uun.alo Sl'atll.t,e (14s thee on . 1952). trhe atrbo.wmo$otnttl101Qe'" ·18t184.0 loca t. ~. cUmllar ano~Qua' aH$ to 'tb., aol"b. .•• ". l' 'Wouid~eeltP'. _ed :'0· . . t~4~h~m.s.ne1'~~~.a hovi.on folcl~li»ao1tlAtQ tAt .r;tesl~l, . e~.t'uQ~·1U' •• , ,fb.l'~"~ J.s.l~l.& ~9.:'.a\UJQtant-l~'Q 'hte tbeol', a, ' Pte~en'. ' .
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. ' '. : J~ ,appears tb_~ tbllt the h.Sb rad~oao~1Tltt ae. t~,· .sQI'taCe lu' thll al'ea ie due to in;lp(J)"tlo181 el1.rloJuneat in 1.t~""ite fl'om an oJ;'ls~l,~OW 8l'a4e eouroo In the UXldEtl'l,.tns· BI'001(1I'0..,6_ Il.~a"'$ea.ln;ten'.. .
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. ~'53i ~wn,JWlSlelnvestlga~"o~ 1951 and , , ,1'5~; P»ogrOt;lS' R$:pQ». O • . Oom~' Bur. .
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PLATE 1
BRODRIBB RADIOACTIVE PROSPECT
GEOLOGICAL
o ,oo
5wle
LEGEND
QUATERNARY
~ Alluvium
TERTIARY
Ferrug inous la teriTe
PREC AM BRIAN
-. ~ . ~ ~)~p:;m Quarrzi ttf!
ic=J Grey and red slate
INTRUSIVES
/f.. Quartz veins.
PLAN
-I
/--/ ' Geological I '
I I I I boundarieS \ / ,_/
AIJ Costeans
I Strik e d ip
I Drainage
'/ /' / # f..,onfours
~R . /~ adlometric / contours.
- PLATE , I -
c
./ Lim i ts · of anomaly ........ I~ 71
I I I I I I I
! 2.00' 81 I ~9X bClr.kg ·0 .... .,4 -1 '2.00' . ."". . . '" . ..-. • h . " n .• -., .... _ . I'<:i ............. l.
1
,. n. " 0 ' ••••••••• ••• • ••. .:. __ •••• • • _ ~4 .
~ ;~c , ,,
...,-.".""
I" f(.e~
~~
IJd • -~ h.·'" ,
~~~~ h . . ~
~ I'
~
/l ' 1\ ,~ . • 0"
\00' 100' .• 0
D ~ QI' . r'
- .,2 ~(~~ • •
.. •
.; • Ir~ - • 00 00' •
I~ • ' .
• ;
If)
~ 0 \ . - 0 , - ,."
"
BRODRfBB PROSPECT f
·SECTION IN PLANE OF D.D.H. · 81,64. !
Sc:",I.~ 0 4fI If I
- LEGEND 000 Laterite §§ . Seric.iTic sc.hi sf , , .0'::-
-0 Grey slate I,~·~' ·~:.~ I . Sulphide Zone
<:.
" d1 - Carbonaceous state lOOt I % e U3 08 - Z
I 8 8 ~ ~ VU99Y Ouortz. .... Quartzite ' I~ h . , .;;
.;
1100'
00
z 8 '"
:z.. '0 9
o o
LimiTs of anomoly ,
PLATE "'
100'
1[IIf 11111 III
I/)
o o !")
BRODRIBB
00
"
PROSPECT SECTION IN PLANE OF D.D.H. 82, B3,B5.
5",\.~ O~I ==~ ____ ~~:==== ____ ~~
LEGE ND c:J Gre!j and tan slate ~ Sericitic schist
lIIIIIlllI Carbonaceous Slate I~'; '~' ~~I Sulphide Zone 1~: .. ";;tI Vugq'.:l Ouartz g, Quartzite lo:ol! 10 e U3 08
(hemafized) I}~o!o' LateriTe.
I/) o o ~
" .
• '#".
I I t
Limits of anomaly
'1"
PLATE IV
BRODRfBB ' PROSPECT' SECTION ,,84k
, . LEGE 0 ", Ferruginou4- Slate ~ Seric.itic. **hi&t Carbonaceous Slatel:i.~:~~1 SulphjdeZon~
Vt..99lJ Ou~rtz.·~,.f§J %e u a 0 e : . . " .. ~uQttz4te ~mo~ .
o o q-
. , \. \ . ,
ORIllHOLE 81
,.
II,
l
l' j' t ~6
II.
"
All
.. " flO
to I>
100
ItI>
110
«0
, .... J
~RODRfB8 RADIO~CTIVE PROSPECT RADIOMETRIC DRILL HOLE LOGS
·.$t:t;ile - / /lcA sr ~o leel: !,'
ORI L.l HOlE B~ ORfl L HOLE 84
, -":';
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-
,. t~o' , t
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,'.i.i.~, .•.... :.' ~~:' .~ ~-,
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"
~
PLATE".
PRtJ.l HOLE· 86 '. . ,." ,
~:'
•••• _ ~ .'if'
. '.C$t~.Sl4!': ts,tt.ic}" . . Cbtbonoeeoua' SIat.~.. . ,r"
.. "~" n.~ . .., Q~lnimQfited\ .. ' • . ' .. \Ie. \fNIc:nu;., .... . \! ,," . '. ~
~Z~· ..
~}\~t~.'~~I"~~:Y · 'Uj,,:}an OM ;iCJ!W,···.slot ••
•. '" : c. " - <~ '_ ',"/''';'
P,ep.flrfJd.,:5i'··lJN.~ifh .' 'N4~lI;jr" I!f!. , ..