renison bell tin field, tasmania · themaelves ft. well be to tbe f!ttecte or topo[\l'opbj,...
TRANSCRIPT
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, C·oMMONWEAL t'H OF' AUSTRAliA'.
MINISTRY OF NATIONAL DEVELOPMENTi
BUREAU OF MINERAL RESOURCES~, GEOLOGY AND' GEOPHYSICS
RECORDS 1950, N°· 4 t
PROGRESS REPORT OF
THE GEOPHYSICAL SURVEY OF
RENISON BELL TIN FIELD,
TASMANIA
by
L.W. WILLIAMS ;....: ... ".' ;:. ~
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COMMONWEALTH OF AUSTRALIA
MINISTRY OF NATIONAL DEVELOPMENT
,BUREAU OF MINERA,L RESOURCES, GEOLOGY AND GEOPHYSICS
RECORDS 1950, N°· 41
,
PROGRESS REPORT OF
THE 'GEOPHYSICAL SURVEY OF
,RENISON BELL TIN' FIELD,
TASMANIA
by
L.W. WILLIAMS
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!testsov$'r, Down ore-bodies . ApPllcabl11 t)" of the met.boda In-ter,l'.etittorr ott-emul te.,
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The Renl.on Bell township la In th~ ~ •• t 00 •• , r~S1oD ot 1'8"0018. It 18 cOO08ctea. b, rall BDd road With Zeehan, aDd by raSI with tbe ••• port. ot BUrble and StrabaD.
The OOUDt:rr 18 ot .ery blSh relief' and Ie dissected b)' num.roue 1"1 •• 1'8 end oreete. The ralnr.l1 1. allah'l, greater than 100 laohes pel' annum. Bod oocura _loll 4ul'1ng the wlDtel' IIJ.Obthe. A8 thl. eurvey wae C81"1'le4 out between the beginning ot April and the end of' Jone, I1ttle time Wfle loa' bece,ue8 o"r bad ••• ther, until toward. the enct of' the aWV.,.
Tin ore w •• ttl'st d1acovered on tbe rleld 1ft 1890, end In 1901 the alulo1ttg ot detl'lt.1 ore cOlllleaced. It .a. 80M rear. later (1909) htwe bat'erS •• were _Noted to trea' the ox1cUee4 ore. At that t~., tbe o~p.nl .. bg~ no •• , ot tre.tlng the eulPhlde., and mining we8 restrioted to the oxidlae4 ore. The reault ... 8 that thla ore _e e.entually worked out and It wa. not until 1935 tbat Renleoft A •• oelated T1n ¥ines N.t. etarte4 'reat1"1 the aulphlde.. !be tutm-e development of the :tleld will probabl)' depend mainly on the working ot sulphide ores. Up to 1949, 2,560 tona ot metallic tin were oontained tn the concentrate. producec1 from the Rentaon Bell field.
Tbe request ~or the geopb7aloal aurve7 we. mr-de b, Renleon Aasociated T1n JUnes ft'.1j. through the ~ 1reotor or tbe Taa.Dlan IIl.,.a Depart ... .,t. The 1)uJ'11oa. ot' the SUP,", wa, to explore ror 8441'10881 orrbodlea wI'bin 8ft aNa ot intere.t, oecupylQg approXimatel, 9 'Quare milee. The pre.ent work w •• oontlned to an area near the ReDlaon Bell maio 104e end 8tt08te4 on the northern ,lope or tbe Renlaon ~el1 B111. Ita purpofte ••• to tea' tbe _F,Detlc anct •• It-potentlal methode over known oreboctl." and to appl, the •• methoda In the eearoh for turther bod1ea In the lmmedlat. Yleln!t.r.
Th r- paz4, oonalate4 ot ~4eaars. L. ~,~. ~',Ullama abel A. J. Barlow, geophyalo1a'8, sod Mr. )r.t). Swan, .e~l.tan'. Iloa' of! the 8urYe,lng waa don. by ~. B.L. Taylor o~ thf TAsmanian ~ln •• ~ep.rtmeD', and bie .a@1a'ance waa sPeatl1 .pp~ecl.'ed.
Tbank. lire also due tC)~wol.on A88001eted Ttn Ift"e N.L. ror 8upPl,iog It tteld aSBlatAot ~OP "art or the tl!'l., ant? to thfl%' atatt ror h~lplng tbe geophJeloal par', in man1 waTa.
u. om LOGY. • t
'the RentaOh flel1 .1''' 1s p8~ oft thl! l'foltth :;)undas tin field, 'he 8eo1087 ot wbleb ha. beeD desol'lbe4 b, Waz-d (1909), Cooder (19i 8) and Reid (1925). The p~1""1colol' area 81'oun4 neftl.oD 8e11 hee beeD deaorib.4 bV ~l8hel' (1943).
'The principal rocks o't tbe North ~'~und8. field are aedlments known ." tbe Dundas alatea. Theil ave probeb17 or C8mblto-Or40yloiaD age and oonal., predominantl, or alate. and tufte but alao 11101u4 ••• ndstonea. 8l'it. aad oonglomerate.. The 41p Ie Dot uol'torll but Is 8'8ne",11, '0 the nol'th-e .. st at 8 low 8ngle.
The Dundaa alatea haTe been intruded bl • aerlee or baslo ianeous rooka rangSng traa gabbro to serpentine, end later br quartsPorph71'ie.. Tbe quarta-porpb,rlea Ire conetd.red to he.,.. been 4lreo'lJ assoetated with tbe source ot th. mineral bearing .olution ••
-/Xbere 81'e
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ft... 81'1 , .. _111 "P" fit 104. ror.'loa.-
1. lfantOW fi •• we 104 •• , .blch 41, .... ,17 a.4 10 •••• N1 .'rltr. pou&'11J oorth-w.... , ... o~ '1M,. 1048. ca It M 'rao •• co'-lINGual, ~.r eadQrabl. 41.t....... "'!be , •• 4".,-- Ie 1'01' • .., ot' tt.8UP.. to b. «eYet .... l'oupl~ ill 11 •• or eo ,obel.u, onea wl'h l •••• r •• b.-paran.l or br •• oM •• n •• u...... . (Pieh,., 194.3). .
2. .. •• 1 •• t.lat-171"B alll-11ke bodies ret"7.t '0 10 •• 11, •• "noel'S". ft •• e bo41 ... " ••• to " 1.'rude. b,t.e. tha -. ... 1". p1anea of'tlle a.u ... b •• 4 ., OOOU" 011 .1'h •• 'he tootwall or baftlia, w.ll 814 •• of th. ri ..... 104 •••
ID .'DePal, the lod •• are .... 1 .. aul,hl41o bo41.8, Ira wbloh tb. II08t abuDda.' ad",pala aN P1rit., pp-rhot1'., qa •• ,. an4 oarboaat •• ot 1rOB, ........ ad _e.l-. n • • e1.tl •• proportions of , •••• ~ •• ral. ~.., eon.l4erabl,. The tl. or. 1. oa •• l'er1'e. Tbe 41.'rlbutlOD at ca •• ltertt. 1. 'he 104 •• la l:rreplU'. lIS pla." rloh •• 1 .. 8.4 poot" •• "W' bat the 00041'10aa aOyerntnc thalr ooourr .... ar. DO' taowa. T.b. c ••• it.ri'a 1e ar.,. tla • • reiDed an4 a.l~ yla1bl. to 'he aat.d ., •• %o.,t whlre l' OOODP. 10 rlOb ehoo~a 1D the ea1ph14 •••
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. A eurft7 .ea o.rrl.4 out 11) tit. 1ft.bit, of "b. Oebl. 8 .. 4 014 Mill W0l'k1QP b, til. I._rial o.opllJal<*l Expel ... ,.l ~ <uaa •• 4 La.,. 19'"). 10 the •• rwe of tbl. a .. .,.., hUJII 41ft.r,.' • .thod ••• " ".Id. ft •••• ," th, .1 .. 'ro .... tle, .. ,,1pot.atlal l1a., .!lr~po, .. 'lal •• 4 _ ... tl. "'bo48. Of 'ba •• _tho", tla .... etl0 ••• touocl to be tb ••• t ... tu1, .",,-tla ••• It-poi.D,ial .... YfIPI -..1v8bl. OOftt1 .. 'lon of the .,.D1t •• ID .1 .. ot 'hi., th ••• w,r. ,~ •. t •••• 'hOd. decid.4 OD tor ·'h. prH'.' 'UI'V',. A 'rS.et 4..-1,tl. or th ...... ",llo~ to11owa.
OIIadtt1oa •• t ReDt ... Bdl .1" •• ., t •• ouMbl. to.,. til • • PIJllca'l.. or tbe_lD.tt. _th04 b .. _._ the or ... bocU. .. eOD.l., 110.'1, ot PJnlao"t., .. bleb b.a •• blab -ca.\l •• usoept1bll1t,. ft •• xPel's. .... ot a. LO.J.8 •• hawd that the bo41 •••• p. of .u'ftiol •• ' al •• to , .. ~. lnt.a •• aaoMlt •• 1ft 'he .p.t10 fle14 ., the eort.c.~ .
. In the pr ••• Dt wOrk, 'be _""'lc '~7 Goa.lete« Itt the .... " .... 0\ o~ ...... i.tl ... lD tile .... rtlqal COIIPOP'" ot 'h. -p.t10 fteld. '!'he 1 •• thMDt .. ed "a •• W.tt ••• rtlealtoree .... 1'10 .. '_.
StIr-po'en'1,l ,,'h,4:
ft •• s, a.a .... 1 .ppl,loatlO1!t of' tM ... '1'104 1. toP 'b. etatac'ton of •• lplll .. oN-bo41a. Which a1'. wet.rco!n. oz14.'10D. Ie 1ft oX141.1aa .Ulpb14. boar. • 41tt ••• Doe ot .1'.'1'1081 poten'l.l 1. pro"-oe4 '-e'.a.D the upper part of 'h. be., .... the part b.low the ox14atloe SOil" A •• r •• u1t or tht. -.pon'.lI8Gb, pol.~l •• 'lon· 8 o".rao' tlew ,.t •• place 1. the bodJ and 1. ~ plat •• 'hrough the ,u1'I'oua41ac rook.. the ourrea' now t. 111 ..... '1".'.' b, _ti ... po'",'1.1 _ .. avemeo'. a' 'he poaa4 .urr.oe a .. 4 1s o~ ... 11 ••• '.1'. ,bat. ,,'.D'1al cnt_ or "" ... '1.,. aenr.' 1. produced 0 .... 1' 'he top of' the ore-b.,..
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The previous work at Ren1aon B ell by the 1. f~. 2~. s. showed t~t tbe ore-bodlee produced ver.1 1ntena. aelf-potential ettecta .8 • result o~ the active natu~e of the oxidation, the high pyrite oontent and th~ prt;)x1mlty of the bOdies to . the surtace.
The results of the .elf'-potentlal aDd nIlsnet10 measurem~nt8, giyen 1ft the to~ of contoure in ptets. 2 (magnetlo) end 3 (welr-potentlel), ahow thAt with e~ch method tbere heve been observed 8 number ot toten •• anomalleB. ~rovldlnB strong indic-atlona of rn1nel'allsatlon. In general, tbere 10 agreement 10 !"o8ition between the eelt-poteotlal and ml8'Ce":tc 8nomalies and it baa been poss1ble to recognise tblrte~n pr1Dc1pal acd more or le •• • eparnte "enomalous ere9.w• Ratber than d18QU •• tbe methode aeT18ratel)" 1t 18 considered pre~el'able to d.tal with each "anomalous area" 10 turn. For convenience 10 rererrlng '0 theae are~8 ot toterest, t~e, hBve been numbered 1 to 1111 88 shown 1n plf!tee 2 aud 3.
T"$a 970£ 'moG orHeDl!1= An examination wl11 :ttt'st be made of the ge6pb.7a1oal
results wblob caD be oorrelated with oXte-btHl1f!8 elIteaell known :tram Burtsce exposure a and mine wor'klnJtfr. fl'he pos1t10n8 ot tbe known ore-bodles 81'e shown 1n plate 1, btJt It $bo\Jl~ be pOinted out that, 88 the mining 1n tbepast has been maSol, l1mited to the ox1dlaed orea, the Info~tlon ayal1ebl. 88 to the full extent ot theae bodies 18 fat!' ~om complete. The Nth.,!' 11'Z'egular torm ot tbe oontQu~ pattern. of both the .el~-potent181 end magnetic anomelie. ma), be attributed to the oomplex shape of the ol!e-bod1es themaelves ft. well Be to tbe f!ttecte or topO[\l'opbJ, and tbeae reotore have made it lmpo8elble to apply 0.01 eat1stedtor, theoretlo~l treatment to tbe obeerve4 :r:~eeulte.
Geo9h18icel anomalies which appesr to be related to known ore-bodies oCCUtt on "enOt'lUtlOU8 erea8~ 1 to V1:-
1. noth tb~ 8el~-potentlal 8~d msgaetlc enoMslles lie on the line ot the Rent.on Btll main lode and occu~ over a mBa81ve ."rrhotl te bod7, .. hi ch 18 exposed on tbe sut'teee aod continues $ooth to tbe Gto!;', Bole. A tloor whioh has been worked 3us' .outh-eaet ot the OlOtt1l Hole 18 probablg a cont1nu8.t1on of this mineralisntion and wou14 account 'tor tbe eouth-oaeteJ.'llv extension. of! both the •• It.potential end magnetio anomeltes.
11. The anoMallee here oocu:r over the ~we~ Blow Lode. ~he IIIl1ftetlo max1mUm (> 4000 gam.es) is locel1eed ~nd occurs on tr8Vel'ee BOOs. The selt-potentlal contour!! show an elongated "negfttlve eentre1t (-400 mtll1Tolte) e~encl1ng' from 800S to gooS':. Tbere 18 8 good ageement between the eua of eaeh anomaly and the atrlke of the lode.
Tbe selt-potentlal contours show that tbere 18 a wel1-merk~ anomsly axt. conneotlng the Itnegetl ve centree tiJ of aress 1 and 11. Thia axl. appeare to be related to the mlne~1188t1on of the Lowe.- Blow Lode between 4008 and 700S end 10 no doubt due to the oontlnuatlon of tbis mdn.ral1aatlon through t~ the main Renteon Bell lo~e. flbe same ael:t-potentlel ane· extendA Booth to .!!tea 111, and there 18 8 8ugge8tion of 8 B1m11e~1~ placed but le88 d~tlned elong~tlon of the magnetic contour ••
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Ul. Both the magnetic maXimum and the se1f'-potentlal ~negatlv. ceDtreU occur on 15008 ant! eolaolde wi th the northern part ot . the Uppet- Blow lode. In each case tbe "form of the enollftl, ,. euch ftG would be caused by • narrow et.ep17-dipplng bOd7 aueh •• s flle.ure lode.
lV. In thts 8!-(t8 the geophysical l'eaul ts ahow 8tron~ enoSMllea eo~r~8pond1ng to the Upper Blow lode between 17905 and 19908 ftD4 the pyrrbotlte floor @xpGeed 1n the No.5 Worklnga. A large amount ot pyrrhotite ot-e bas been unooYered and the oomplex nature of the oontour pettet-us mar be largely due to vftrIat10na 1n thickness o~ the overbo~deD. Prom tbe magnetic results there 18 evidence that the tloor exPo8ed 1n the No.5 Workioga extends ,to approx1Dl8tel, 300E on trBver.es 1790~ end 18905. .
V. The eelr-potentlal and magoetl0 ano~911e8 oorre.pond to • lode known SA the nro •• 10d.. A large 1rregular oz1dlaed t1oo~ 18 8~.oc18ted w1 til a 01"088 t18.u~e. '?l:'om tb~ magnetic end •• 11'potential anomsll@8, l' would *pp •• r th~t the ore-bodY, A8 mapped by Flehel' (1943) ftltom expo.urea on the 8otwraoe and in the open cot, r~pre8ent8 on17 the northern portion ot 8 more exteneiTe body, An~ that there 18 a 8ub.tentl81 extension to the800th and partioolarl, to tbe aouth-e.et of the previous17 known limits. In the latter dlrectlon the selt-potential anomaly 18 pertlcularl, intense with. -negat1Te oeot1"8" of -500 millivolt. at 875E/1100S.
Vl. A fairl, ,trons locali.ed selt-potential anomal, 18 pre8ent here, but witbout anJ appreoiable magnetIc aDomal7. A tlsaure lode. and a tloor ocour 3uat east ot·~he centre of the eeltpotential aDomsl,.
Appl10Ability o~ tbe meth04t'
From the ~o~egolng reault. 1t Will be •• en tbat. 1n the 8rea oOY(lred b7 the present au",.)', tbe knowQ or..-bo41 es produce, alMost wIthout exoeption, strong magaetlc,and •• 1f-poiebtlal anomalies ahowlag that tbe two ~etho4a used would be .p~llQabl. to the •• are. ~or otber 'ore-bodies 1n the ne01800 BeU 8rea.
In ~neral. the%'e 18 8 good agre*ment in position between the InMontione from the two methode end 1 t sbould be poss1ble to locnte the' p08it10ns or ore-bodlee with' eonalde1'8ble o~teint,. Rowever, it 18 apparent tbat, 1~ regerd to the de. tailed reatures of the anomalies, tbe aelf-potentlal and magnetio results 40 Dot alW8,. show. 010 •• oorrespondenoe with oDe another. Thl. Ie probably ooly to be expeoted when It 18 oonsidered tbat the bodi •• , con slating or combinations or tloore and fleeures, 8re verI lrresu181' in .hap., end tbe PJrrhot1te end PJrlte contents of tbe lode. are by no meane un1fo~~ Furthermore the .elt-potential e~t.ota wll1 be Influenced by tbe depth of the oxidation zone, wblch although generall, Shallow, 18 ~ob3ect to variations throughout tbe area. AS me88ul'edat tbe surface both the magnetla and •• It-potential anomaliee produced b, en o~e-bo41 are elso likel, to be affeoted b7 the irregular topograpb,. For these reaaona lt w1l1 probab11 be 41fttoult to deduce w1th o~rtaintJ the exao' boundaries and structures or the ore-bodies ~m the geoph,elcel results. It ahould be stressed thet the geophysical anomalies glYe no idea of the tin content ot the orebodies trom wbich ther arlse.
Interpretation or re,olt!:
The megnetie and selt-potentls1 results obta1ned on those perts of tbe 8rea wbere mdnerelisat10n wne prev10uelJ
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unknown wl11 now be oons1dered. There 8:~ seven "anomalou8 .r8ft·." (aumbered Vll to Xl11, and ahown In platea 2 end 3), where the results app~8~ to be 81gnlrlo~nt.
VU. In tbls area, tbe position. o~ the rm~51'U!~lc and eel't-potential anomalies are 1n oloa. ear •• Men'; tbe anomalies ere intense 801\ 8UIM€lIIt thst the m1l'ler-el189tlon p~r.lat. :tor 8 tHetence ot about 700 t'eet. The moet likel, 1nterPl'etatlon 18 • tl •• ure lode wltb A weet-north-wea' 8t~lke, exten41ng from the ~negotl •• oent1"e tt on 10006 along the aelt--potentlal enomal1 .ld.a towal'dIi the "negAtive centre" o~ area Xl. There 18 a1ao the pos81bility o't "1'1001'8" being aaeoaiated \V1 th such e tie.ure lode.
Vll1. Tb~ strong ma~etl0 enoMel, probably indiootes an isolated p,rrbotlte bodr, probabll e t18su~e lode, DeBrl, 200 teet 1n length. Tbe aelr-potentla1 enomal, observed over' the SlJme area Ie relatlvel, weak.
IX. In this er~a tbe InItgnetle end sfJlr-potentlal oontou~e do not matoh "Ier'l well end although there Ie definite evl«.1enoe or adn erall sat Ion, It 18 dltrlcult to ~orm an, conclusions regarding tb~ extent and strike ot tbe o".e-bodJ.
X. In tMIt 8rea tbere 1e • nagnettc enomal, OD1,. Ae tbe area 18 close to tbe Renlaon Bell Creek 1t 18 po •• lble that tbe aUlphide bodY does not extend above the ground water level. In wblch caRe oxld9tlon would not be taking plaoe and no selr-~otent181 et~.ot would be expected. 711e rmgDe-tlc 1ndl(J~tlOft 1e pel'eletent 1n lengtb end 88 It continues to the north-_tat ~a ~~r 88 11n~ 00 It 1. pl'Obabl, due to an ore sboot tormlng Van or the !-:enI80n Bell main lode system.
Xl. 'I'he geophJ81cel anoma1iea he~. are complex end 1 t 18 dlt't1-oul t to see the relation.hlp betw.en the reeult. 01' the two methode. The Il!agftetl0 "h1gh" OccOP .... J1n17 to the ~6£.t or tbe 8el:t-potentlf111 "negative centre". At 16909 950R. 'where the tnc!lcntlon8 001nc1de, a "rloor" baa b~en exposed by shallow. workings. 'The aelf-potential snoul, 19 1oteD8e (re f '.ohl·ng nluee of 1e8$ then -SOO millivolts) and ahowe aeveNl l'od1atlng Axea. suggeet1ng :fft1rl, e%tene1'" sulphide rn1ne:re118o"lon. fJ'be mo.t pronounoed 01: tbeae 8xe8 t. tn tbe l1ne of" the pl"Obable t'1A8ure lode o~ 8pes Vll end 1t is oonaidered that • very r~8sonabl. interpretation would be 8 tlosure lo~e wIth an aasool&te4 "rlool'" or considerable extent. It 18 oleaI' that the obee"nt1on. shOUld be extended tUl'tbelt to the east to obtain 8 rm~e oomplete pioture ot this nano_lous elNa".
Xll and XlIl. OnlY eel~-potent181 anomalies bave been observed on these 8rea8. On the tirst, there 8~e two ~n~g8t1 •• centreaBUg'Heeting 8 aubeldiuy n •• ure bl'8Dohlng ~om tbe Blow lode, 'on the second, thl!' enoMalJ coyer. en appreoiable ares Rnd appe8l'e to indicnte eo OOCUlTenoe ot" mlnl!l'811sat1on i801ate~. t'l'om the maio Blow lode 8pt-.
v. DIUf .. L!Nt) nr.:,!')Q!/t.v tJDiiTIO!fS.
Tbe r~commended drl1l.hole~ listed below are Intended tor the purpose o~ teating the geophyelcal anomalies whloh appear to lndlcate b1therto undleeoveped ore-bodies. The dlttlcUlt7 In deterrnda1ag th~ 8tpuotur~ and ~tt1tude of the bodies trom the ~eopbyaloRl result. haa been pointed out, and 1t 18 oOl'ls,1deNd that the recommended ~111 holes, while proving the existence or
-/otheRlse
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etb.rwl •• o~ ore-bodl ....... 1.'.4 ~i'b th. g.o9h7alcal indio-.'lon8, wl11 al.o pro~14. 8 b •• i. top • ~r. Go.plet. lat.rprtt.tl OD ~ 'he ,. •• u1 ta or tbe -,l" ••• nt aunt, end of tur'h~ aUrTel. which .. ~ b ... de 1n the Renlto. Bell area.
R!9O!1!nep4,d !?rii\l BQl,,_
~ole lfo. Oo-ordinat •• or .AP •• to b. True Beaplo .. nepre •• on 0011 •• ' •• ".4 ot bolt of bolt
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01 10'08, 180. nl Vert, .. l -(12 12008. 475- 'fl.! 24.7 30 03 14008, 5.". Vil 187 45 04 14006, 2"_ Vl11 202 45 05 17908, 2158 IV Vet-ii •• l -n6 1e908, 600. lX 247 4' 07 16508, 960B II 187 45 08 $)OS, ~CIW nIl 277 60 09 500B, n,. X 202 4' CliO 10008, 900. V 187 ,0
011 5008, 40W nl 247 60 •
(~: Owln. '0 aD errol' 1n 'he aur .... 'log. 01) •••• Nl 'reTer ••• t • p ........ 1". i •• orNetly _r'k.4. The tol1ewlo, ls • lin ot COl'rec'lon. to tbe pec .. rklngl'-
Tn.era. 20008 .bou1 d pea4 19908 _ Traver.. 19008 should 1" •• 4 18908 . TJItI •• rs. 1800S shott14 re.d 11908
1'Jt ..... 1.-•• 11008 mould "a4 16908 Traye ••• 1600S ahoold read 160,S •
Tbe 00".0'.4 T.1Q •• ,h ••• be.D ua.d tor the co-o~41n.t .. ot thtlt p19opo •• 4 4rl11 hole.* e.g. G., who •• cG-or41nat". ape . 17908" 27,. w111 ha .. e lte OGllar ., pq _rkea 16008, 27,1). -
A ~e9 wol'4 •• f .%pl .... tioD .re De.ded with 1'.,,1'4 to tbe a.180tloD ot _. ot 'be drlll hole alt •• &1 ... 8 .bo~ ••
OD '1''' Vll. hol •• G.1. G.2 end G., would , •• , both the •• I~-po'eatl.1 •• 4 ..... '10 ladl0.'lon8. Th. .e.tioa1 bole 0.1 i ... lnl, 1.'en4 •• to , •• , tor a po •• lbl. -floor- •• 4 'b. 10e1t •• a bol •• G.2 aDd G.3 tor a ria.are lode. It cOD'tnued taP .. oullt, G.2 .,111 , •• " t.he gPOo.,' below 'b ••• cocdarr _gnetle "!tIp- a' aot too p.at a ".,th.
The porpo •• or G.5 1. to ahow to what extent 'he -f!'1.'lc 800_17 o~ a)!lea IV 1. 1nd10at1ye of ao ellater1, extenslon 01: tbe nd.ne1'811 •• tlol'J oocuJ'r1~1' 1ft the No.5 \\'01'-'10,..
013 ar •• IX it .hould be po •• tble to t.et, wltb 0011 ODe f.irly .hallow bole such •• G.6, the condition. below both the RBRnetl0 Whish" .ad the •• lr-potentlal "negatl.e oentr.-.
ft. lao1 •• G.8, 0.9 and 0.11 ahould pro.14e:;'lfttor.et1oD ue.rul 10 expl.lnla« wb, •• lad1cat1on me, be ob •• rYe4 witb on • •• tho4 (either "~ft.tlc or •• It-pot.at!.l) unaooom»enied bl aD, eNect ob •• r .... 4 1fl th the otb. _thode .
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..... .... ,':)i;~~~r1n~i th~t~~ ,jnol1tbs' that 'th~psit\¥ ,,8$ "'1m the . ' . :t1eldan , ttt'ei\) ot· ap~;P~l)~l' '1/1Qota e",s:p.'m11e waseoyel'~. 'Usi'M tbems~ettc ~l'id.self',i;,..pOt~t1&1 methode.
The. l)ul\lose!(jit~ •.• U~ w~s tc,"t$.1; 'these method .. : ovsfi' known :or~ ... tiodle$ a l'l~tto itWeatlgat.f.l' tllEt PClUl$1bil.1 t.v 1.)"f .othe~
J;u'd1 ~s :tn tbel •• d;1at. viele!t1'. Tbtt.l'mlal.'ts .. rA: . tbe6Ul"'fW have .' e.etebllSl1ed'thatthe "~gnet1c eCd.41el:t-poterttlml·'~ethod8a.tte".' ? 4Ql'1!tbl. of looatln,g w1'th .neldembl~o$X't.1Dt, iibetrpe,o;r sul:,b.td~bo~ Wbieho'CCUPs at Ren.istm;Bel1. .' 8f!ve~1 fslg'td.t1cB.ftt 1.41o.a,tloau have been ~seZ'ved .1n"n~t a of' trhe,J1P:ea. ;wbere OPoe-. bo41~$he dnot been Im·own -preyiousl,., , ,
Eleven:dri.l1 holes bav~ . beenr~e()~d!'t_ ded to" teat what' ~~~:r ,'to' be. '1 n~U,ca~ 1cmsot'urni1 ecovered,or,e-bod1·es. . SU'Ch;,'-4r1'lltng wo-ulcl ed4oona14erabl), to the ve1ueof' t'be presents~rv'e1 by gt ying1nf'ortnatloD whioh ",wcul'a .be. useful, 1n',tbe1nte'Ppretatlol or the resu,lta;'Or'!IDt fu\ut+e· Gripet.ie sod .eelf,..."Gtent1al invest;.
._r·lge.t1oils ln th.tl ltenl&ptI-Bell .f1·el4. t I .. ' ' '''' l
~, !the~~~lt. -lll.eh have been ·obtaiDf:4 3uatlt7 8~ 'j" . .• extension of thesu·I''Ve''',.belondthe 1t=t •. of' -the .,.,,*, Oov.,"Hi bJ .1 the pJ"'~$ent w()rk.- In psMlcular. 1 t 11111 be de.1~lIld:e to eneit4 th~surve1'e the eouthilnit 8Goth-eaat. to. traoe comr51etel.v ,be anotflslles lfbi eli heve been observed natip tbe f.H»lth'erc ltm tand 1ntheaGuth-ealJterc' coitner of th4!ts"...· ;, " . .- ... '
Condere. H •• 1918
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.• The 'fin Fleld or North 'Dun48s,~" T'sa.- . , 6eol.8Urv. BUll,. ,No.26. \,' " .'
-T1!Ji; ·1mINC%P!.ES AND mOTtoS OF .. j
Cl)JopmrSICALPROSPEOTI'NG:. o.U.?.l Lon4oD,91-i"08., " ""'/ . . . , "f\, .
... ()eo1og1w:el ile'pcri on 'b* Jerd.son·~el1 . 'f1n Fleld,Comwlth. of Aust. ,. Mill. ReA. SU"_ Rep~·No.1943123. ' " , .
... '. -' fteOUne.' .:1ne~alPleld. Tas.a..ol.
~.aUl1.N'o.3b.· '. '
.. the 'Tin Fleld oj N.ortlf lA1ndas~ ~Q.:.Geol. ~urv. Bull. 'No.6. " .
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