BergvesenetPostboks 3021, 7002 Trondheim Rapportarkivet

Intern Journal nr Internt arkiv nr Rapport lokallserIng Gradering

Trondheim ÅPen

Ekstem rapport nr Oversendt fra Fortrolig pga Fortrolig fra dato:

Sul125- 71- 13 SulfidmalmA/S

Bergvesenet rapport nr

BV449

Kommer fra ..arkiv

Falconbridge

Tittel

Report from a combined geological-geochemical reconnaissance near Tronfiell in theTynset Alvdal area 3-8 au. 1970.

Forfatter

E Overwien

Kommune

Tynset Alvdal

Dato

1971

Bedrift

Sulfidmalm AIS

Fylke Bergdistrikt 1: 50 000 kartblad 1: 250 000 kartbladHedmark Trondheimske 1619216193 Reros

Fagområde Dokument type Forekomster

Geologi Geokjemi Rapport GamleTron gruve, St Knut gruve, Tjteremyrgruve, Tronslien gruve, Ny Tron gruve, VesleTron skj.

Restofftype Emneord

Malm/metall Ni Cu CoFe ZnS Cr

Sammendrag

A/S SULFIDKALM

Report

froa

A oombinedgeologioal-gekoohnioalraoon-naiaanoenearTronfje11in theTynast-Alvdalarea,Hedaarkcounty,Norway.

Auguat ard-Sth,1970

By: E. Overwion

A/S SULFIDMALMINTER-OFFICE MEMORANDUM

1. juli , 1971

R. Jahnsen-5JUL197117R

J.B. Gammon

Date:

To:

cc:

From:

Subject :

Tronfjell rekognosering - august 1970

Vennligst finn vedlagt Overwiens rapport angående den geologiskeog bekkesediment geokjemiske rekognosering som ble foretatt avham og Jacobsen sist sommer.

De vil bemerke at de gjenfant en gammel nikkel forekomst ogfikk, noen interessante anomali soner fra den geokjemiske rekog-nosering. På side 13-14 trekker Overwien opp hovedlinjene fordet "follow up" program som begynte den 8. juni.

Vedl.

thlz44-

In conaltisi

"teal,'obsiffititil

*r.;.44ipaisnts^hat Tronfj.flirea, .,

1 INTRODUCT/ONr

The reportdialswitha gsologicaland geochmaical , •

reconnaisancein theTronf5e11areabetweanAlvdalandTynsotinMedmarkcountyof Morway,and tookplaceAugust5-91970undør•xcelløntweathørsonditions.The workwas oarriedout an behalfof A/S Sulfidmalmby Jan JacobeenandE. Overwir fromtheNikkel-verk in Krietianeand,the formarmainlyoollsotingetreamsedimentsand the lattørmainlyoarryingout geologicalreconnalsancemadinvestigatingsomsof ths old minesand prospectsin the arsa.

Tronfjell,whichis a 1595m highmountain,consistingof gabbroand withits top approximately1200m abovathe surroundingvalleys,ie a dominantand famoustopographiefeature.inthesoeneryin thispartof the eountry. It is situatedapproximatelySO km E of th. Folldalminesand $0 km SW of the oldminingtownof

Some old coppermineearsknownto be locatedsomedistanceup themountainsides. By comparisonwithmapsof minøsand prospecsesen in filesat NGU in Trondhelm,and availablegeologicalmaps,one getethe impressionthatsomeof theminesare situatedingabbro9loseto the contactwiththe surroundingmeta-supraorustals.It waø thereforedeoidedto aarryout a reconnaleancein the area.

2 COMMUNICATIONSeto.

Amoessto the areawhichis situated250kaN'of Osloand 50 lusSWof Rerosis excellant.Oneof the railroadaOslo-Trondheimpassesthroughøsterdalenon theweet eidøof themountainas doesamainroad. To the eastone of the mainroaderunsbetweenthe samatowns,and tharsis alsoa roadwhichleadsto a TV and FM transmitterontop of the mountain.The areainvestigatødis covaredby the AMSmaps 1119II Tyldaland 1811II/Alvdal.

Accomodationie usuallyavailable,exceptforthe mainturist01111114011.

The travellingfromKristiansandto AlvdalandTynsøttcekplacewith the writørtsown VW 1300.

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2. PNEVIONSINVESTIGATIONS

Geolo

The noct reoent publicatIon from thls area followed by a geoaogi -cal map in ecale lt100.000 Is

NeLiziTYNfir by P. Holmsen and G. No1msen (1960). It sovereiSe easfirn part of the amta of Interest, whith the weetern isditeoribed and a000npanIed by a map in soake li lønstm1n

NgUallik I21124by Wolmer Marlow (1826). Other •publIoatIons ofInlareapf rePerred to by P. And G: Holmeen are:

hjaa{zuebbigsNigranotiser on Allokinnan oah dese nirmaatsongitning; e.r.r.bd. 14, 1, 1482 and Grunddragan af Det eentraleSkandlnavIens bergbyiknad, 11188.

LigrontNOU169. Geologiske og petrografieks undersøkelser i

T-Ynset-Fsmunden, 1948.

At the moment a mapping program in the eastern part of the TrondhelmregIon of the Caladonidee between Folldal and Ritros 1s beIng iarrledout by geologiets and studente trom the UnIversityflof Oslo underguidance of Professor Jans A.V. Sugge. The program ie mainly basedon thesle worke (hovedfageoppgave) and is sponsored by Folldal VerkA/S, A/S RdrosKobberverk and KillIngdal Grubeselekap. In the41vtal-Tynset area mapping has bettn coneentrated to the west sideof the river Gloma to follow the main greenstone belt whIchIsthemost favourable hostrook for Cu-Zn mlneralIsatice, 1n thie arsa.

A German geologist has recently taken a Ph.D. degree an Tronfjell •(probably eponsored by Folldal Verk as well) and It will probablybe publiehed within the next few years.

Two years ago a geologist froa NGUeollected samples from thevarlow depoelts around Tronfjell in order to oomplete the orecolleotion and oarry out some mineralogioal work.

Minin and E loration

Mining activity etarted around 1780 on the oopper daposito west ofTtonsvangen on the southweet elope of the Tronfjell Massif. Themaln produotIon started around 1880 when several other depositenear Gamla Tron Mine wer. disoovered, of whIch St. Knut's Mineand Tjaremyr MIne were the most Important.

The only Inforaation availablo at the A/S Sulfidmaln file on thesedeposits ars reports by the Mlnister of Mines during the period1887-1907 whiah have been copled from the MInIng file of NGUinTrondhelm. AectordIng to the reports, the minee had been developedto a depth of 40 m. Setween 1889 and 1883 St. Knutte Mine produced721,7 t of hand sorted ore with 8%Cu, which was.shipped to the

•

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emelterat Wiros.

The otherdeposttesTranelie Nåbet,TronehvelvetandNy Trandwereprobablydiseoveredand:Xinedaroundthe FiretWorldWar.Of theseTronshvelvetis said.tohavehad the largestproduertionwhitathe othersafterthewriter'sjudgementhardlyexesededthe developmentstage.

In 1969NGU earriedout en IP surveyforFolldalVerkA/8 antund8t. EmntleNine,and duringour reeonnaleaseein Auguet1970aTuramsurveywas takingplaesin tha samearea. An oldergridnet withpieketsworealsosminto thenortheeartof TrenellenNime.

OVNERSHIP

UntilAugust1970only two pointsnearTrontjellwera staked(muted). FolldallverkA/8 hae one pointat Ny TronNineandone by Tronsvangen(probablySt. Xnut'sNIne).

On the 7thSeptember1970A/S Sulfidmalmetaked(anmelde)points near VeeleTronon thenortheidsof the Tronfjelliwasifwherithereare indieationson niekeliferouepyrrhotitominsralisatien.

GEOLOGICALSETTING

Tronfjellie looatedin the southernpartof ths eentralCaladonianantain beltof Norwayealled the Trondhsimregicm(TrenhoLes-feltst). The looalgeologioalformationof prebablyOrdovielanage is to tha southand eastunderlainby lowmetamorphioEoeambrianreeks(Sparagmites).

Agoordingto P. Nolmsenwho mappedthe areaduringthe beginningof the sseondWorldWar,Eoeutrian GrOolles and tillidexare looal-

reetingconeordantlyuponthe underlyingPreeaambrianrolksmainlyeonsistingof granitsewithinolusionsof veriousbasiorooks. Alloohtonousabovetheseformationefollowstronglyfoll-atedeparagmitee,augengneiesee9phylliteswithquarts-mleasehistaand amphibolites.The 140tterrformationiø bellevedtohavebefenoverthrustedthe formerfromNV, wherethe oentralpartofthe Caledenianrangeie looated. The asphibolites-grmenstemesaremainlybelievedto be partlyof intrusin andpartlyof extrusiveorigin.

Tronfjellis an isolatedgabbreie phaeoliteor plugwith •diameterof approximately kne. It ie surroundedby quarte-miee

schistsandmainlyfoliatedamphiboliteswith inwarddipeof300 - 600.

Accordingto Holmeen,the contaotrookshave a higherdogresof metamorphismthanotherrookein the viainity,givinganimprsssionof a gabbromassifsurroundedby a contactsone.Garnetiferousmicaschistsare observednearTronkalven.

Holmsendescribesthe Tronfjellmassifas a partlydiffersnti-ated gabbroiophacolitewith looalvariationsframparidotiteand anorthositsto oommongabbro- the latterbeingthe dominantzcrook type. He statesthatdunitesoccuras smallbodiesas w.ttas inirregulardykeswithinthe gabbro. Anorthositehas onlybeenObservedin boUlders.

Ths most commonroaktypesars olivinsgabbroandnormalgabbrowith monoclinepyroxene,the latterdifferingfromths formerbyabsenceof olivine. Therealsooccursmallamountsof a typsoontainingbothmonoclineandrhombicpynoxenewithoutholivine.

Most of thsmassifis fairly fresh,butHolmsenalsomentionssmallstparteof alteredgabbroesandolivinegabbroes,whichhe describesas sausu*itegabbroes.Smallermassifeanddykssof similaralteredgabbroesocourwithinthe surroundingfoli-atedrock,especiallyon the northandeastbeide.The Sulfidmalmreconnaisanosconcentratedmainlyon traaingthe approximatecon-tactof the massifandnot so muchon the pstrology.The exposedpartoof ultramaficeesenwithinit, wersmaximum40 m langand20 m widewiththe contaotscovered. Onlyoxidesandno sulphides •were observedmicrosoopioallyin the locallyheavily serpenti-nizedbodies. Minorbodiesnsarthe contactof the maseifN ofTronsvangenhavebeenquarriedfor talo.

Ths writergotthe impressionthatths gabbroiarocksare gettingmore finegrainedas well as moretectonizednearthe contactsofthe mainmassif. Accessorysu/phideswereobservedlocallynsarthe contacts,but alsoin the interiouanparteof the massif.

A distinctstructutalfeaturetunsNW-SEalongthe north-eastside of thsTronfjellmassif. Zt showsup veryclearlyon theaerialphotographs,and outoropeof a myloniticroakwersobeervedalongit. A few prospectpitsare sunkin a nickeliferouspyrrho-tite mineralizationa fewhundradmetresNE of it, and ths areaalso containsanomalousNi and Co valuesin ths streamsediments.

6• Mineralization

All the mineralizedzonesssehin the areaoccurwithinthe countryrocksof the massiffroma fewhundredmetresto 1500metresfromthe supposedcontact.

A. OldminssnearTronavan to the southof the maasif

GamlaTronNine,St. KnutNinaaad TjarenyrNineare all loeatedwithina phyllonitiovarietyof the quarts-serielteaohiatapproximately1600m to the southof the Tronfjellmaself. Theold workingswerevisitedduringthenightssinoemappinganda Turamourveywareoarriedout by a orewfromFolldalVerkduringthe day.

St. KnutNins i. looatedalongan intenslyfoldedand shearedsone • mineralisedwithmainlypyrrhotiteand ohaloopy-

riteaa massivpods,veinsand stringers.Quartsand aarbonateara gangueminerals.Ths sonswhiohasemedto be at least2m wide strikesapproximatelySW and dipsup to 27 0 towardsN.Foldaxispiungs.up to 300towardsW. Two shaftsandone trenohwers observad.

GamleTranMine 414 looatedalang/4eakerandtliaral1s1andar struaturaapproximately100m NW of th. former. Strike

and dip direationsaeemto be moreaonsistantandthe dip iateeper - up to 66 °.

T mre Mine iø altuatedapproximately600m W of the two other4118GA p ly alongthe samestmuotursas St. NnutMine, A

76 - 100m longtranoh,3-4m wide,followsan irregularsinsra-hissd shaarsoneor breoolastrikingE-W anddipping600N. Theareabetweenthemineeare eoversdby swampa. Nearly100 a furtherwest in an areawithno outeropsa vertioalehaftis sunk. Amineralisedsamplefromthe surroundingon dumpassayed:

Ni % Co % Cu % F.% Zn S %•

0.008 0.018 8,8$ 28,1 1,44 1 17,0

An apparentlynarrovpit withminormineralisedblookearoundissunkapproximately100 a 8-SEof the shaftand eouldbe St. Thomaamine.

A workingoalladSt. OlafNinewaa not looated,but is alipposedto be situatiedsome600 a E-SEof St.XnutNine. If it ip assooiatsdto the sameatruature,vi herehaviean irregular .adaeralisedsonewhiohoan bs followedforat least1100a alengthe sts4ksdireotion.

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TronslienMIne

is loestedin greenetone-siphibolitein the steepslopeS ofNordklettanapproximately700a N of the foraerlymentioned'aineeand the saaadistanoeframthe oontaotof thamassif.

betwesna massiveand a more follatildvaristyof the grøsnatonsthereis situatedan up to 8 a widestronglysohistosesene,strikingN 76 W and dippingup to 68 ° towardsN. tAlonga etrikelangthof 26 a severalpara111111 - 10 om wideand •apparentlyoonoordant1ensesof dominantlymassivepyritsapdminorpyrrhotiteandOhaleopyritewersobserwedvithiathis1100%*•

Two samplelefromthe dumpnearan at least$0 m inolinedshattasøaysd:

Ni % Co % Cu % Pst Zn % S

Pr. 14 a 0.011 0.006 1,10 28,4 1,78 18,6

Pr. 14 b 0,028 0,008 0,1$ $6,2 11,3 $2,0

About40 a belowthe top of ths shaftthereis an aditwhiohpro-bablyiø ocintaotedto tha ehaft.

78 m W of ths mineralisationnearthe top of the ehaftthe exassohistosssonebeoomsemineralissdagain, mainlyby pyrite.The widthis up to 2 a of bresoiaors. Dip ie around1100andsmallopen foldeplungings4s200towardsN oan be son.

Ruatoanbe øsenin an inactosesibleelopealangthe atrikedarso-tionmorethan 100i furtherto the weet.

C N TronHina

is looatedwithingreenstons-amphibolitenearGrøtia(a stream)on the sast sideof the aaingabbromassifapproximately700mfromthe ocataot. Bslowa fairly massiveandmediumgrainedvaristyof the grsenstonsfollowsa 2 a widarustsonealongasohiatoseand sheand variety with strikeSW-NEand dip $00to-wardsNW. An aditis drivenintothe tootonisedscnefollowbngthe strikedirmotion.3e10wthe massivitvarietyof the gmentons followsa $C sa widequartsvein,a somewhatthinnermonsof maseiveeulphides- mainlypyrrhotitewithminorohaloopyriteand the restof the shearedsonewith looaldisseminationsofulphides. Ths footwallroakis a finegrained,foliatedcrein-stone-amphibolits.

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An oresamplefromthedumpassayed:

111% Cot Cu % Te % 7nt St3

Pr.2$ 0,00$ 0,0$0 0,32- $1,2 0,013 18,0

An otherslmllaraditis looatedapproxlmately$0m to theSVand2$ a above,andsomeainorblastinghastakenplaseinthezone100m furtherlntheeamedireotionWhereit seemeto fadeout. To theNE themineralizationiø ooveredby overburden.

D VesletronNiekelShowin

Onthe050a highmountalnof Veeletron(vesla• seall)loaatedbelowTronfjellandto theNE,someoldpitehamebeensunkalenga mineralizedzoneof sulphides.No reoordshaveas yetbeez ,foundon theseworkings.Fewoutoropsin thevieinityof theshawingmadeit difflaultto geta olearpietureof thelooalgeology.Verylittletimewasspentexaminingthesone,butsampleewereeollested(mainlyfraathedumpe)andlaterassayedat theNikkelverk.ThepyrrhotitemineValizationturnedoutto be alskeli-ferous.

Themalnplt(a)whiohis at least3 * desp,is euhkin an approxi-aately m wideruetsonewhiohseemsto strikeN $$°E anddip4$ to theeast(1). Thehostrookls a fine-mediumgralnedmetagabbroionok, partlymassiveandpartlyfollatedtogetherwithlightandshoietoseroskeof a moreaoidoompositien.Oreenstensealeoseemto b* preeent..

.Theaineralizationoensistedof massivepyrrhatiteWithsomeabaloo-pyriteaswellas dieseminationof mainlypyrrhotitein thezetagabbrolorook.

Approsimately$$ m to theweetof pit(*)there1s eituatedaruetyouteropand1$51mto th*westa siallaroutoropwhereminorblastinghastakenplaos. Purtherto theweetao outoropsareto ba seenbeforereaohingthsstram NV-SZlineamentwithmylonitieHrookepreviouslymentioned.

20 a totheeastof someblastinghasbeenearriedowtlnrustyoutoropandanother20 m to theeastanapproximately$ m

wideinolinedshaftorplti. sunkto prebablyverylimiteddepthin i similarmineralizedoutoropas(a. TUrtherto theemetand norththeoreaiesovered.Thisgivesan approximateetrikelengthof thesoneof morethan200m.

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To the SW of the nentionedlineamentthenain massifrisesverystesply. Outoropein sonestreamvallsyseoneistofediumgrainedgabbroierookewithinolusionsof foldedgraphitsbearingsehietswithminorpyriteandpyrrhotite.It is not eleerat the momentwhetherthesegabbroierookerepresentthe boarderphaseof the nainmassif nar, is it elearwhetherthe baelorooksat the YesletronNi Showing has any relationshipto theTrwafjellgabbro. Furtherworkis neededto solvethis importantquestion.

A thiaseetionof a eampleot massivesulphidesoolleatedfrempia a to the eastoontainedapproximatelyt

55 % Plagielase(andosine) $7 % An, serisitised.25 % AaphiboLt (aotinolite7)<5 % Zeisite.2 % Opaques (sulphides)aeoessories Titanite

The rookwhiohis alteredandteetonisedoan be olaseifiedas aeta diorite.A poliehedseationof a samplefromthe eamepit,oontainingapproximately50% of massivesulphideswith eilioateinolusion.had the followingoompositions

Ninerale Eet. % by vol. Graineisie(nm)Max. Averags

Pyrrhotite400,2Sravoitet3/4Pentlandite1/43:7-$0,15Chaloopyrite20,07NagnetiteAeoessorie

0,07

0,06

The silloatsinolusionswhiehlookaleagatedhardlyeontainanysulphidee.

The pentlanditeooeursas separate grainein olustersirregularlydistributedthrougIoutthe pyrrhotitemasee. Thereishardlyany flamelikepsntbtdiflto see. Approximately57% of thepentlanditele alteredto bravoits(7).

The averagegraineiravefthe pentlandite,0,06mm, eorreepondsto approximately270neeh (Taylor).

The followingsampleswere analysed,

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S- Ni.100 1[1.100

Ni% Co% Cut re% 8%

o*•

ve •p .

Pr.S7afr.pita). 1,180,100,1175147$0,024,11 2,42 2,4t

Pr.117,.Nasolve•ulph.otfrom pit o) 0,800,140,8184,818,011,5 2,111 8,20

Pr.57hosem, •alph.o IIin meta gab-

broiereek 0,180,0180,11 ,8 2,4 17,1 8,41 8,78

The 8/Niratiois not veryexoiting,but indioatesa betterratiofor tha dissaninatedtypsofmineralisation.

3) Otherlooationswith minorsulhides

StroamSW of Welstron Ni Showin This looalityis alrsadysor • an ywe sampo sontaining1,7%8 showsd0,0114

Ni and 0,080%Cu.

9 dtlaon eideof Tronfa11 A rust sone probablyup to •

ø • g ap telyE-W and dippingSivto thenorth situatedsomedistaneeawayfroathemainmaseifin the streamoalledertitta.A wa11 foliatadfinegrainedsioemamphibolebearingquartsriohrookwithmoredarkaramphiboli-tio bandsis partlysehistoseandsheared. Speokeand finedieseminationof pyrrhotito('upto 2-$%)andainorohaloo-pyriteWerenoted. A samplwassaying0,74%S oontained • 0,018%Ni and 0,025%Cu.

o) Streamon N sidoof Tronfø 8 of AumiliganApproximatoly800a o suppesa g oon ao an up ø 100a widerast sone,strikingN 720E anddipping700to the southwas looatedin a stream. Riohorpartsof tha sone..-nontainsup to 2% ofmainlypyriteand somsohalanyritsovnirwidthsof maximum$metros.

The sulphidediseeminationooevrein varionstrooktypes(metagabbro- greenstonesand quartsites).A samplemaying0,78%$ oontained0,02$% Ni and 0,08% Cu.

d) ContaotSE sideof massifose og ro oen

natedpyrrhotita.A oempleNi and 0,088% Cu.

ar S rklattan Amphibolitøverysonoor amountsof dissemi-

assaying0,74%S oontained0,005%

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e) NInerallsedbbooke Soneblooksof gabbroleeemposItiomeon g or pyrthotItedlemmetnationwerelooatednear theultranaflobodyon theSW eideof thenassif.A sanpleassayIng0,01;% $ oontalned0,0111t Ni and0,08% Cht.

A eampleof naselvepyrrhotin-ohaleowitewasdIøeovered1nthe1westernnoetN-SrunningstreannXof Tronevangen.Thelosallty1saidwaybetWeenSt.NnutMIneandthegabbroecntaettothenorth. Theeamplalookelikeoresamplesfromthenines* ofTronevangenandpossIblyderlvesfronthese.

g) (tirantealneralletiob WIthintheserpentlnIteloostedenSheo • orerratiegehtfaofehrealteweredls-

eovered.Neetof theultramafiobodyiisbarren.

Acoordingto theexistInggeologioalmapea ehrositeshowingle eupposedto be eituatedfurtherto theNE,butItwasnotpoesIbleto looateinthefield.Poselblythieiøtheeaneehowingdeseribedaboveor It istherustsceeo) foundintheetroanfurtherto theNE.

h) be itsnotlooated HåbetprospeotW of Nidtklettenono • maseifwasnotlooated,norwasTrønshvelvet

oopperdepositE of Flat-Tronon theSE •ide. Fronthemoun-taIntE of Tysladunpsweresesnin themountainøideaeroesthevalley. Theseareprobablyrelatedto the1atterdepoeit.

f) Sonn)e blooksfound1n thseanestreaneloseto thetaloquarries.andthegabbrooontaotfurtherto thenorth,wereolassifiedla thefleldas massIveamphibolite(neta-gabbro7)wIthninorpyrrhotItsdissealnatIon.

A sanpleassayed:

NI% Co% Cu% Fe% Sn% S%

Pr. - NIneralisedblook 0,00* 0,003 0,0** 11,5 0,411 2,4

7) STREANSEDINENTSURVEY

a) Introduetion

1%0eampleswereoolleetedInthestreanseurroundingtheTrenfjellmassif.Inthesteepnountalneide,espeolallyon theweetsideofTronfjell,it leextrenelydiffieultto eolleetthedeeirablenaterial. Possiblyparteoftheeolleotedeanpleeooneletof

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thefinerportionof till'vashedintothestreamfromthesurroundinghanks.Thieshouldbe takenintooonsiderationwheninterpretingtheresults.

Theeamplebagsveretekento Kriatiansanddried,sievedto- 110nesh,sentto thelaboratery,to be analyeedfertotalNi Co,Cu andZnby atomioabeorbsion.Thefrequeney41e-tributionwasealeulatedtogetherwithaoeumulativefreesenity.Vithouthavinganydatafromthearea,thefollovingoIagelfi-oationevereussidt

->104 aoeusnlativefrequenoy(.1L'% fltlossiblyanosalous-71114% fl fl " t ProbablyS. tAnomelous.

Thevaluesarsplottedon drainagenapein sealelt 28.000andtheveriousoategorLesof anomalouretreamedrawnvithoolouredpeneils.

b) Resulte

Threearsesareinterpretedae anonalous.TheveryhighCu-Inanonaliesdownstreamethemines ofTronevengenmustbe oausedby contaminationandvillnotbe diseuseedhers.

la--Initsra.:_åmeittaant4.1141.2t.Inatitil.TheareashoseanonalousNi andCo values,andVolstratnieke1showingie aleolooatedhere. Tharesultsindioatitsanomalotestreaneto thesouthof themainOtteving.It ie sonewhatsur-prieingthatCu valuesarenothighereinee theminsralisedsoneoontainea fairamountof ehaleogrite.It isworthnoti-eingthatthemealietreastbellevedto draintheknownshovingdoesnotShowanemalousvaluesof Ni andCo. ThiefaatmakeeonebellsvethatthereareothersourethethantheknovnTettletrenniaksi showingto oausethehigh values.Dr.R. Sandhas pointedoutthattheareaeoineldeeviththeNV-SEetrikinglinea-mentvithmylonitiorooks. On theotherhandanonallesoesurup-streemsfromthetectoniosoneaa ve11.

Trenevama.:Nidtk1ettenaisiv s onideof Tr11,11,flr

The area,andespeoiallythenainwesternsoetstreamby whiohabloOkofmaseiveeulphideswesfound,showeanonalouevaluesofNi, Co,Cu andZn. Niekelvaluesareveryhigh.Ninorbodieeof soapetonsandserpentiniteooeurinthearea,butmightnotexplainthehighNi valueswhioltalso000urupetreamsfromthsknovnotteurantste.A treekor pathusedby tourietsbetweenTronevangenandthetopof themounteingoesnearby.Poesiblesontaminationshouldnotbe dieregarded.Steelvive

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ware notioed 1n a small stream draining the vesternmost soap-stone quarry.

The arø& showe anomalous Cu - Zn valuei in soveral samplee. losoof these oceur upstreame fnma the nineralised sona in the ntreamand NytroUm Mins.

The main road from Trensvangon to ths television station on topof Tronfj.11 lo very olose to the uppermost part ofPos•iblecontimaination øhould bo taken into sonsideration.

!s..6reALEALtaltitairlielOnly a few samplee wsre oollepoted in this area whiahmakes it diffi-oult to assosa the results. Outorops of phyllites were notieed.

Hollbrødslen (Aen • the stream) shows soms anonalous Zn values.Saveral "østørs" (mater summør farm ) are looated along the•trsam as uw11 aø saveral "søterroadfl. Contamånation must hetakon into soonsidoration.

Thewhole ftwinftøide of the massif givos oomparatively hith valuesof all 4 elemants, whiohmakss ona suspeot thare might be a rola-tionøblp betwoon arau 1 and 2.

SUMNARYANDCONCLUSIOX

The reeemnaissanoe hae shown that the knowa eulphide dopeeitolooated in Shs Tronfjell area betwoon Tynset and Alvdal are neteituated inelde or along thek oontaot of tho main gabbro masolf.Ibe sulphida ehowings vieited, all seem to be mooiated withteotottio-sonos ( shears, brecoias) within the surrounding foli -ated mata supraorustals ( amphibolite - greenstonso and quarts-mloa sehiats).

Based on analysse of samplela oollooted from the oulphide showingsvialted, tha delpoeite oan bø, devided la $ groupsi

Cu - Zn sineralimation ( Sw side of massif )Cu • ( SE * le w )

N1 —Cu le ( NE 0 0 * )

Tho stream sedimont survey does not oonfirm this soning olearly,but gives somuindloations.

----/ 1$.

The depositsnear TronsvangenSW of the massifwhich must haveproducedseveralthousandtons of ore, turned out to be the mostinterestingfrom an economicpoint of view. In a heavily coveredarea mininghas taken place at variouslocalitiesin aCu-Zn mineralizedtectoniczone along a strike lengthof morethan 1 km. Fol1dalVerk is investigatinthis depositat themoment. The Ni-Cu showingat Vesletronto the NE of the Massif is an interestingdiscoveryalthoughthe relationshipto the main eabbrois unclear. Rust has been noticed over astrike lengthof more than 200 m in this coveredarea. Threesamplesfrom the dumps assayed 0,13 %, 0,88 % and 1,18%Niwith sulphur-nickelratioesof 17 6, 19,5 and 24,9.

The stream sedimentsurvey in this area has proved anomalousNi-Co values in the drainagesystem. The same is the case inSIDE4streamsM of Tronsvangenwhich also containhigh Zn and Cuvalues. The Grøtåa area on the E side of the massif has givenseveralanomalousCu-Zn samples.

Based on the results from last year's reconnaissancethe followingfellow up work is recommended:

I VesletronNi Showing

1. EM/Mag survey (compass and pacing)aroundthe mineralizedzone.samplingalong some traversesacross the same zone ( 10een each sample ).d geologicalmapping aroundthe Ni showing.

ow u stream sedimentsam-ling

N side of Tronfjell ( Ni, Cu, Co, Zn (Mn))sea 2: N"of Tronsvangen(Ni, Cu, Co, Zn (Mn))

GreetAa (Cu, Zn, (Ni, Co, Mn))

Possiblythe area between 1 and 2 on the weet side of the massifwill be sampledas well. Sampleswill be collectedeach 100 malong the streams.

III Bank sam linF

If the samplerfrom area 1, 2 and 3 can be analysedduring thesummer and give enceuragingresults,anomalousareae should befollowedup with streanibank sampling.

IV Geolo,icalma in

The main gabbromassif with surroundingfoliatedsupracrustalswillbe mapped in a scale 1: 15.000. Areas 1, 2 and 3 will be giventhe highestpriorities.

...../14.

Special attention will be given to the contact zone, the possi-bility of layering withing the main massif, as well as the possi-bility of a relationship between it and the altered basic bodiesand dykes in the surrounding foliated rocks. Samples from themain massif will be collected for a possible rock geochem. study.

Re-ional eochem. surve

Strean sediment samplingalong the drainage systemthe east - and north eastby the localities Alvdalsjøen - Tyldal - Alvdal;greenstones.

e carried outn an at least 300Tronfjell. The

Tynset - Telnesetand contains zones

for each 250 mkm2 large area toarea is )1)ounded- Brydal - rinstad-of amphibolites-

874

• C's\i/

./

TRONFJE LL AREA.

02

•

1081I.

VESL RON

PY

Gaeis

c?!

ertis iro

TRONKALVEN

1020 143 I

42

AUMA

AUMÅSEN

828

2

'‘56

484

ts 775

223

666

/36spit3945

Po CP ?

y, 1652

In

50 Sit

596

(5e0\ b.Cla

27 NYTR59

.. 23

97 6

9r5

7

716 D

•

866

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944

65 ...

/

860

5

TRON

1666

•••-4 36

TJÆREM+NR.27 60.

cP Po N ANGEN

T. NUT.

T. 0

0-27

( 0, (a, Zn

FL T-TRON Pocp

1.708_ VESLETRON? TRONSH VELV E T.

`1.1220

SORKLETTEN_1. 822_

515

Ei3T YLLOA

85

963

4.32

STREAM SED11‘ENTSFROM TRONFJELL AREA,HEDMARK,NORW4Y.

2 km A/S SULFIDMALM kRISTIANSAND S.

1080

971I

880

NYSETRAk orbe Isen.

Z79 958

.4LVDAL866t":13

B56

EXPLANATION.

9 DL D MINE ( Cu.)11

( N )PROSPECT PI T.

DISTINET STRUCTURAL FEATURE

SHEAR

LINEATION

--CFOLIATION

CH URCH.

å TRIG. POIN T,

x SPOT HEI GHT.

MYLONI TE.

fl ME TA UL TRABASIC.( SERPENTINE —TALC.)

GABBROIC ROCK S.

GREENSTONE—AMPHIBOLITE -MASSIVE.

GRAPHI TE.

SCALE OBS:E0-JJ _ . 7W:Jer _ AUG. 70

1:25031 TRAC „1-1 NOV.70

OUARTZITE,

Cr.py.po.c p.g

QUARTZ -SERICI TE SCHIST. BOULDER(MAINLY. )

MAP SHEE TS

161911 AND III

CHROMESHOWING.PYRITE,PYRRHOTITE .CHALCOPYRI TE.GRAPHITE,

SUPPOSED EXTENSION '---/ OF MAIN GABBRO MASSIF

OUTCROP

863

97 6

874

A u rn1655

26

84

cd

72

160

••

AUMA

484

140

198

108 80.

52

88

716 DAUMÅSEN

828

185 37

v. 775

02

60

0

IN

70 .9/

q

10

66625

ho

30

2

45

120105 4

120 250 2

78

44

140

160\

54_54 34

-

_ 4036

0,'

866

135 50

cr

1081

65 400

500

320VESL RON

TRONIC4LVEN

GQ 1020320

-/e4

cp,r,

125

TRON

is 1666

130130

95115y. 1652

20

130

102

112130

70

604-

201g.

831 15

20

4535

59620 20

4 --,,62 72

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00 , FL AT-TRON

MIDT

------- "\52„,, X 1308r 41.412

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20

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SORKLETTENI. 1322 56

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32 32

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20 15

515

25

30

10 to

22\42

22

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134

479

Ee

OLD MINE ( Cu. ) Eal CHURCH.•

" " ( Ni. TRIO. POINT.

PROSPECT PI T. X SPOT HEIGH T.

Cr. CHROME SHOWIN G.

30

C2222 60

182228

14 26

32

34

12 20

34- 88r2 6 /4ty YSETRA

971 Efe

TYLLDAL

20

8.5

25

865

860

5

432

SCA LE OBS:EOW AUG. 7

W: J.1 AUG. 701;25 OCO NOV.70

,

MAP SHEETS

161911 AND

4030 25

40

STREAM SED1MENTSFROM TRONFJELL AREA.FIEDMARK,NORWAY.

( N )

' A/S S LF IDMAL kRISTIANSAND S.

9582

963

ta.

56

ALV(JAL 866

71/7 TOTAL N I CKEL CONTENTA p.p.m.-80 MESH.)

190 300 400

90% 95•/. 98% ACCUMUL ATIVE FREQUENCY.

. 874

AUMA

A u rn

AUMÅSEN

14 828 7

14 28

144

484

el7

12 716 D

02

1 775

213 2 8 2 0

8

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Cr

22

12Z)-(

12

2 012

9-14

1/8

8

18

24

-7- 4 /

0 12 ' 8 z/

102

14

_./10-

68

886

tv YTETRA7

3

3

8 4

4 12

12

47910958

14

104 65

96316

5866ALVDALEF3

856432

TOTA1 COBALT CONTENT. ( p.p.m. -80 MESH.)9 OLD MINE ( Cu.) EISI CHURCH•

- I Ni. I A TRIG.POINT.

0 PROSPECT PTT. X SPOT HEIGHT.

Cr, CHROME SHOWING.20

90•

27

95%

30

98%

p.p.m.

ACCUMULATIVE FREQUENCY.

STREAM SEDIlvENTSFROM TRONFJELLAREA.HEDMARK,NORWIW.

Co. SCALE OBS:E0.-.11 AUQ. W:4Å AUG.70

125 CO3 TRAC: - 1- 1. NOV.70 '

MAP SHEErs1619H AND 111

A/S F1DMAL1k. 1.RISTIANSANDS.

863

976

N

TRo\iKALVEN,

1020

3

7

14

12

7

28

al)(>28

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tysQVC,

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14

7

7 6

la,

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7

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4641666 9/6 52

15

r 6E2

4

2

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q

8652

515

FEI

r liLLOAL

4

860

MIDTKLE.be1198

NOWKLETTEN

1686

)6

16 816

oo

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113

FL TR(7NX 1308

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4 1666 201652 38 24

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54

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122

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58126

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640 bit's

50 nn

19

5961821 24

FL AT- TRGNX U08

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863

976

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819

16

13

13

EE3

TYLLOAL

SORKLETTFI:1. 1322

MIDTKLE Tr E )c 1198

10254

4036

60NORDKLETTEN

l4 81086

40

32

46

384 70

74 40

38

30

46 61 16

515

18

24

22

15 1622

16

28 1822 85

6552

34

50

T N ANGEN 16

36 18•30 46 å

1080

x7 82

° 380 6

32 97!3°

48. /, 26,._,

22 28„-ic 2226 ----- 20 »30

32

1060 32 22 - 880

NSETRA 2692 24 40 Y -24

860

22

_95824

96326

ALVDAL 866Es

856

EE1 CH tJRCH.iS TRTG.POINT.

X SPOT HEIGHT.

TO TAL COPPER CONTENT. ( pp.m. -80 MESH.)

60 90 1 0 gm.

90• 95% 98• ACCUMULATI VE FREQUENCY.

5

4.32

9 OLD MINE ( Cu.)( Ni.)

0 PROSPECT PI T.

Cr. CHROME SHOWING.

STREAM SED1NENTSFROM TRONFJELLAREA,HEDMARK,NORW4Y.

( Cu. ) SCA LE OBS:E0-J.1 ARAW: _ AUG.70

1:250W TRAC:JJ NOV.70

A/S SULFIDMAL M RISTIANSAND S.MAP SHEErs

161911 AND 111

863

1655

46

AUHA

484

-62 .

56

6652

66

42

,40

36 5

en

A u o-

U `e716 D

"st775

02

AUMÅSEN

828

72 so5

48

56

52

52

2324

80 66 226

8434

58 44 6054

38VESL RON

",..z50

52 TRONKALVEN

GQ 1020

cr30 Ibeis

er

52

866

66648 • 30

748452 •

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4 1666

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68

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976

34

34

6436

80

(

6052

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26

y. 1652

94

72

288(5(s eikbi).

160

6-3

7140

831 1113088

108

596

72

66

24

40•

48

MIDTKLETTE )e 1198

FL AT-TRONX 1308c

49 ,

54L'47 LF N (1":`1.12217 944

53

5638

606NOROKLETTEN

1631086

489, 5soRKLErrrt,

1. 1322

38 86554 34100

ace

•

499

-X565649 46

eo

47 T.NFV ANGEtv 3638

s152

4846-49-73

803 8 3_ _ t-59 46

886

ty K-ETRA49 52

46 68

84'nflbes%„,

i.

90

frY

60 64 5°97 •

59

60\40

48

28 84

74

963

ts•

4

958

860

5

432

SCA LE AUG. 70

AW: JJ. AUG. 701;25 003 TR,(4:-;:JJ Nov.70

MAF' SHEETS

161911 AND ny

56

36 38

515

54EE3

88

7242

STREAM .-EDMENTSFROM FRONFJELL AREAHEDMARK,NORW4Y.

A/S (_/•RIST:4NSAND 5.

866

80

ALVDALEE3

747 TOTAL ZINC CONTENT ( p.p.m.-80 MESH.)CHURCH.A TRIG.POINTX SPOT HEIGT

OLD MINE (Cu.).

I Ni I0 PROSPECT PI TCr CHROME SHOWING 80 90 160 p.p.m.

90% 95% 98% ACCUMULATIVE FREQUENCY.