UfilBergvesenet Rapportarkivet

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Ufil
Rapportarkivet
Bergvesenet
5th
Posthoks 3021. N-7441
Bergvesenet rapport
nr
1rondliciin
Rapport lokalisering
Internt arkiv nr
Intern Journal nr
Gradering
7359
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Ekstern rapport nr
Fortrolig fra dato:
F.M. Vokes
Tittel
A report concerning an inspection of the disused Skutterud cobalt mines at Modum, together
with a discussion of the results thereof and reflections on the structural control of the oreripnncitinn
Bedrift (Oppdragsgiver
Forfatter
Dato
Vokes Frank M.
Ar
og/eller oppdragstaker)
NGU
1956
Kommune
Modum
Bergdistrikt
Fylke
Buskerud
Geologi
Mineralogi
Råstoffgruppe
Råstofftype
Co, As, Cu, Ni
Malm/metall
Sammendrag,
innholdsfortegnelse
Skien
17141
Dokument type
Fagområde
1: 250 000 kartblad
1: 50 000 karlblad
Forekomster
(forekomst, gruvefelt, undersøkelsesfelt)
Modumfeltet
Skutterud
muggerud skjerp
Middagshvile skjerp
Bennece stoll
Ludwig Eugen stoll
Klara stoll
Nordgruven
Troegerort
eller innholdsbeskrivelse
Engelsk tekst.
Den generelle geologien blir gjennomgått i sammenheng med områdets strukturer i tilknytning til strøk/fall og
lineasjoner.. Det blir spesielt gått inn pa fahlbåndsonene.
Likeså bliranalyser av rnalmenvurdert. Det blir tatt en del prøver.
Dannelse av malmen og malmkontrollenblir diskutert. Forfatteren er helt bestemt på at fahlbåndsystemeter uttatt
til bunnen på strekningen Skutterud-Svartfjellgruve. Det meste av mineraliseringener borte som følge av erosjon
på et nivå i det sub-Cambriske peneplan.
Vedlagt papirkopier og tracinger av av en rekke snitt samt et senere lengdesnittgjennom malmsonen.
å
•
larant
_
?
CaAlf03;lut
Pcnrian
erosjonsfloiY
orr'eneliit
(st sone n
1
"ennln
kilden
G.C.
14
SKUTTEAUDGRUVENE
thviit
400 Midd
Sourt. Meilem Nord
kvi ko&n. skj
Nwedkollert
ski
Svarffidly
400
Djupdalsskj.
300
200
100
100
2
mehr
3
km.
FIG.
D.
4
5
0
mciti
A Reportconcerningan inspectionof the disusedSkutterudcobalt
mines at Modum, togetherwith a Discussionof the resultsthereof
and Reflectionson the structuralcontrolof the ore-deposition
by
F. M. Vokes.
e ort f in ecti .
The inspectiontook place in the periodfrom 15th to 23rd
June 1956. The writer cooperatedin part with the NGU party
under Th. Siggerudwho were carryingout a radioactivesurveyof
the area.
b ect f the n
e ion was to examinethe surfaceworkingsof
the Skutterudmines and all safelyaccessibleundergroundworkings,
with a view to deducingany structuralcontrolswhich may have been
operativeduring the depositionof the ores. The information
gained from the field data and their analysiswas to be used to
aesess the possibilitiesof discoveringfurtherore. Proposals
for futureexplorationwork were then to be made.
Areainseected.All the sufaceworkingsbetweenMuggerudSkjerp
and MiddagshvileSkjerpwere examined. Specialweightwas placed
on the main mines from BenneckeStoll to the north end of Nordgruven (see longitudinalsection). The undergroundworkings
inspectedcomprisedKlara Stoll (x-cutand drive north);the
stopes UstreNo. 11, VestreNo. 11 and part of VestreNo. 10;
Ludwig Engen Stoll (x-cutand drivesN and S); Nordgruven(open
cast and all drivesoff this);Upper and Lower Bærum Stollsand
LenneckeStoll.
Use was made of the old mine plans,and especiallyof those
containedin the reportof BergingenibrEeltzen(October1952).
Re
ts f in e ti
(see disduseion). The resultsobtained
from the inspectionshow that the ores at the Skutterudmines
occurredin
horizontellyelongotedshootshavingsmall
vertical,as cwpared with horizontal,dimensions. No structures,
(or other indications)can be found which give rise to the
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as
-3fahlbåndtMidlerefahlbåndand Vestrefahlbånd(see sectionce).
Rosenqviststatesthat thesevariousfahlbåndsare separated
bands.
narrowamphibolite
from each otherby comparetively
The main strikeof the rockswithinand on eithersideof
the fahlbåndzone is N-St and the dip is nearlyalwayswith
100 or 200 of the verticaltmostlyto the east.
The lengthof the main fahlbåndzonein the area is about
11 Kmt but the writer'sinspectionwas confinedto the section
of the Skutterudminestfrom BenneckeStollin the southto
in the north—a distenceof about
LudwigStoll(Nordgruven)
1700metres,
. Thereare very few deviationsfrom the overall
and few of thesecan be correlated
N-S strikeof the fahlbånd-zone
with the main ore-bodiesas shownby the old workings.
betweena
There is a slightevidenceof a coincidence
workedpartof the zone and a swingin strikedirectionin the
most southerlyopen-castof Sörgruven(on the westerlyfahlbånd
here). The strikeof the footwallrockshere swingsfromN 20°W
to N 10°Efrom the southto the northof the workingtwhichis
up to 20 metreswide.
Northof the Bærum"stolls"the strikeswingsto a direction
about200W of N for about100 metrestbut then swingsbacktso
workings
thatat the southernextremityof the .:Mellomgruve
it has a directionof a few degreesE of N. Thisvalue is
maintainedfairlyconstantlyas far as the northend of Nordgruven
As will be seenfrom the sectionalongthe workingsthe
area of the above-describedswingin strikeis apparentlya
here
barrenone. The old trenchesalong the fahlbånd-zone
revealonlyweak rusting. Also a drivesouthfromKlaraStoll
no ore in depth
x-cutalongthe "Midlerefahlbånd"encountered
in this area.
The rocksalongthe wallsof the largeopen cast of
Nordgruvenalso showa very slightswingin striketfromabout
N 10°Wat the southernend to N 20°E at the northern.
On the otherhand the largeopen stopeof Mellomgruven
givesno evidenceof otherthan constantstrike- her almostN-S.
Thus the correlations
betweenswingin strikeand thicker
ore are very unsureand it doesnot seemas thoughtherehas
been any ore-controlthisway.
Localvariationsin the valuesof dip are numerousbut all
are within200 of vertical,the majoritybeingwithin1006 As
can be seenfrom the sectionsacrossthe ore zone,the dip as
a wholeis generallyto the east.
An attemptwas made to deduceany linear
trendsin the ore-shootsalongthe fahlbånd-zone
in orderthat
thesemightbe used to pointto furtherore. As can be seen
from the longitudinal
section,the outlinesof the old workings
are not veryhelpfulin determining
ore-sbootdirections.They
indicatealmosthorizontalshoots,with a comparatively
small
verticaldimensionin relationto the horizontalone. The greates
verticaldepthof the main workingsin Mellomgruven
is 110-120
metres;in the othertwo mines,the workingsdid not extendmore
than 50-70metresbelowthe outcrop.
It is generalexperiencein ore-geologythatore-shootsare
often elongatedin the lineation,or stretchdirection,of
the
encicsingrockswhen theseare schistoseor gneissose.Thus
measurhments
were made alongthe outeropof the fahlbånd-zone
and in the accessibleundergroundworkingsof the linearelements
in the rocks.
Thesewere two typess
A preferredorientation
of the elongatedminerals,
especiallyhornblendeand biotite.
A groovingor large-scaleslickensiding
alongthe planes
of schistosity,
especially
well seenon the wallaof someof the
old stopes,e.g. the west wall of the largeopen cast at Mellomgruven. This linearelementindicatesmovementalongtheseplanes
-5.
tor.catt)
mentionsthe phenomenonbrieflyunder the
Rosenqvist(19149)
headingof "Glidestriper".
showedthat the two
Carefulmessuremntsand comparisons
linearelementscoincidein direction,and thus theyweremapped
-tit,
as one olinem(direction".
have beenplottedon the
The lineationmeasurements
sectionof the workings,and the generaltrendo
longitudinal
of the lineationinserted.
The sectionshows thatthe plungeof the lineationis
everywherefairlyflat,usuallynevermore than2003only
were valuesas high as 400 recorded.
occasionally
alongthe surfaceworkingsshoweda steadily
The measurements
N-plunginglineationof the orderof 200 fromBenneckeStollto
a pointabout150 metresnorthof the BmrumStolls. Thislatter
pointappearsto be the centreof a depressionof the:lineation,
and northof here the plungebecomessouthat valuesof 150-200.
thereoccursa
Just northof the midpointof Mellomgruven
of the linearstructuresand the plunge
markedculmination
resumesits northerlydirection.This continueswith slight
variationsin magnitude to the northand of Nordgruven,(an4,
Skjerp,500metres
, lerst as far as Mi44agshvile
incidentallyat
northof Nordgruven).
workings
in the underground
The lineationmeesurements
agreefairlywell with thoseon the surface. However,those
Stollshowa shiftto the northof the
takenalongLudwigEfigen
seen on the surface. The rlungehere
depressionand culmination
is much flatter,•butit can be clearlyseen that the culmination
northof
of the lineationoccursabout150 metreshorimontally
its positionat the outerop. This meansthe crestof the
plungesat about40° to the N. If one similarly
culmination
examinesthe depressionof the lineationto the southof the
it can be seenthat its troughplungesnorthat
culmination
about30°.
. 6 .
The structural
significance
of theseplungesof thedepression
and culmination
arenot epsy to see. Theywouldseemto imply
theectionof a coupleoftrocksalreadypossessing
a uniformly,
N-plunging
lineation
(seeFig.A). ThiscouplewoUldseeato
be due to an overriding
pressure
fromthenorth.
Fromn pointof viewof correlation
withtheore-bodies
it can be seenthatall themainstopesof MellomGruvelie
betweenthelinesof plungeof the twolineation
features
(see
section).Thismightbe takento implythattherewasan orebearingzoneplunging
northat about300 in thisarea(seeFig.
B). However as willbe statedagain,laterexamination
has shovn
thattheminerflization
at theLudwigEngenStolllevelle
definitely
uneconomic.Thereis,of course,alwaysthe
possitility
of furtherfl
lyingufishes"
of orebeneaththe
levelof LudwigEagenStoll,as suggested
in Fig.B.
Thisstructurel
evidence
of a continuation
of orein depth
is so weakthatit is not c-nsidered
worththeexpenditure
of
moneyneededto testit. Theonlymethodwouldbe by means
of an inclined
holefromtheLudwigrfigen
x-cut,a holeat about
45°dip in a duewesterly
direction.
It willbe suggested
laterthatthereis goodcircumstantia
evidence
thatthemineralization
at Modumis of onlyshallow
depth. It is thewriter's
opinionthetthisevidence
is of
moreweightthanthatafforded
by thelineerstructures.
e • No E-W structures,
e.g.faults,majorpoints
etc.,wereobserved
in theareaof themines,whichmighthave
had a localizingeffecton the ore-hodies.
. As statedpreviously
allaccessible
underground
workings
wereinspected.Particularly
carefulattention
was
paidto thefloorsandwallsof thestopesin the system,Östre
No. 11 - VestreNo. 11,and thebacksand sidesof thedrives
ex.LudwigEngenStollin orderto obtainan ideaof thenature
-7of the minernlization
underthe deepestworkings.
As a generalityit can definitelybe saidthatnone of the
workingsshowedmegescopicallvisiblesu
y
lphides.Even close
inspectionof hand specimenswith a hand-lensonly revealed
very occasionally
a smallspeckof cobaltsulphidesor odd
spot's
of chalcopyrite.Cobaltbl')om
(erythritew
)as noticed
ikplaces alongthe backsof someof the drivesat various
levels,but examination
of the rock beneathit did not show
any noticeablesulphidcs.
A comparisonof the mineralization
seenduringthe inspection
with ia-gespecimensof the originalore,now in the Geologisk
Museum,Oslo,indicatesvery clearlythatno more "ore"remains
to be takenout of the old workings.
As a confirm-tion,
rcndomchip and grab sampleswere teken
in the courseof the work. Thesehave beenanalysed(spectrographically)
for Co and Cu, as follows:
RSM 1 Nordgruven,
chip sampleof pillar
in the main open cast
RSM2
% Co
% Cu
0.08
Nordgruven,
grab sampleof spoilin
southend of easterlystope,open cast
0,03
RSM 3 VestreNr. 11 Stope,chip samplesouth
of x-cutfrom ÖstreNr. 11.
0,02
RSM
0108
UstreNr. 11 Stope,gr[b samplefrom
brokenore near top of stope
0,01
0,02
RSM 5 Elarastoll. Drive southex x-cut
at 70 metresN of Klarax-cutin the
"VestreFahlbåndu
0,02
0,01
(AnalystsSentrplinstituttet.)
The ebovevaluesareof the sameorderas thosefoundby
Rosenqvistand Heltzen,but ratherlowerin magnitude.
Rosenqvistestimatesthe originalore at Modum to have
contained0,08%
0,1% Co. The valuesgivenin the report
by Heltzenlie between0,01and 0,1 ø Co, with the majority
below0,05%.
-8Mineralization
with suchlow metalvaluesdoes not seem
to the presentwriterto constituteworkableore. In spiteof
Rosenqvist's
assertionthat"themine is by noe meansexhausted"
it doesnot seempossibleto restartworkingunderpresent
conditionswith sucha low metalcontent.
Conclusions.
It is clearfrom the evidencein thisreportand from
thatof previousworkersthat the Modumores formedlong,shallow
ore-shootswith no preferential
plungedirection,apparently
closelyconnectedwith the presenterosionsurface.
ThIs fact (accordingto Rosenqvist)
led A. Buggeto make
the suggestionthat the cobaltmineralization
was due to
secondaryenrichmentof a primaryPrecaml-rian
metallization
under the sub-Cambrian
peneplane,Rosenqvist(op.cit.p. 210)
givesfiguresshowinga fall in the Co valueswith depthunder
the presentsurfaceto supportthisline of thought. The
presentwriteralso agreesthat the formof the depositindicates
some sortof horizontalcontrolnot too far distantfrom the
presenterosionsu:ace. However,the minerAlogyof the ores
is not one whichwouldresultfrom processesof secondary
enrichmentand cementntion;
cobaltite,skutterudite
and
arsenopyrite
(danaite)are primaryhydrothermal
minerals. As
far as the writeris aware,cobaltis not knownto form
secondary,enriched,sulphidesin a manneranalogousto, say
copper. The resultsof the weatheringof cobaltores seem to
be confinedto erythrite(whenAs-bearing)and cobalt"wad"
(asbolane).We hav% for instance,the authorityof Goldschmidt
(1954,p. 669) that "cobalterenide
weathersreadily
formingthe arsenateerythrite".The oresworkedin the upper
levelsof Modummineswere, to judgeby the many specimensin
the Geologisk-Minernlogisk
Museum,certainlynot erythriteores.
They were primary,hydrothermal
sulphideores and the causeof
- 9long,flatform of the ore-shootsmust be soughtin structures
controllingthisprimarydeposition.
Rosenqvist(op.cit.p. 211) statesthat " the occurrence
of a seriesof cobalt-bearing
sulphidesshowsunequivocally
thatan ore-mineralization
tookplacein r
fl
withoutgivingany evidencefor thisassertion.
The presentwriterproposesthata Permian
aze is much
more reasonablefor the Modumores. Thiswouldbringthemin
line with the similar,thoughnot identical,ores of the
Kongsbergarea,only some40 kms. to the WW.
The evidence
affordedby theselatterores seemsto showquiteelearlytheir
Permianage (see,e.g.Bugge,1917 and Neumann,1944). The
ores of bothareaswould seem to belongto a silver-cobaltnickelmetallogenetic
provincealong the immediatewestern
bordersof the Oslo Eruptiveprovince. Theirgenesisseems
undoubtedly
connectedwith the emplacement
of.thedeep eruptives
in thisprovinceduringPermiantimes. (Neumannsuggestsa
geneticconnectionwith the Dremmensgranite.)
If we can presupposea Permianage for the Modummineralizationtwe are in a positionto explainquitesimplythelong,
flat formdisplayedby the ore-shoots.As Rosenqvistpoints
out (p. 210), the presenterosion-surfacis
e not very far
beneaththe originalpositionof the sub-Cambrian
peneplane.In
Permiantimesthis peneplanewas coveredby a thicklayerof
Cambro-Silurian
sediments,mostlyimpermeable
shales. Any
mineralization
comingup the zone
of weaknessnow represented
by the fahlbåndrockswould become"dammed-up"
by this roofof
2aal
shelesand would spreadout longitudinally(N and S) *4
4oof toas
3one. Sihca thR GoKFrelliKr
or nearlyso, the resultingore-shoot(or seriesof ore-shoots)
would be horizontaltoo (seeFig.(3).
This typeof controlis well-knownin ore geology. Just
as one examplemay be cited the long,ribbon-like
lead-ore
- 10 -
bodiesof theiennines
in En-land.Thesearelocatedalong
faultsin limestonj
eustbeneatha roofof impermeable
shnle.
The implecations
of theabovesuggertions
are thusthat
theModumoresarenot of greatdepth,andthatthepoor
mineralization
seenin,a.g.,LudwigEigenStollis dueto the
factthattheoreshavebeen"bottomed"
by theworkings.
As McKinstry(1e4e)pointsouteveryore-body
or system
of ore-bodies
musthavean "inlet",
a feedingchannelwhichgave
accessto theore-forming
solutions.Therelative
concentratio
of ore in theSkutterud
mines,especially
MellomGruve,suggeSt
thischannelmay be locatedsomewheri
en thisaree.•Itcould
evenbe thattheN-plunginstructur
g
deecribe
e
on
d p. 6 is
thisfeedingchnnnel•If so,it
be expected
to contain
someore to greaterdepths,but thestrikelengthwouldbe
taff
veryshort,probably
notmorethan300metresandtheprspects
do notwarrantanyexpenditure
in lookingfor thishypothetical
ore.
Sincetheore-controls
(aspostulated)
seemto have
produced
a long,shallow
ore-body,
or seriesof such,search
in depthis not to be recommended.
Thisleavesthequestion
of the searchforfurtherore-bodies
alongthestrikeof the
fahlbånd.Herethetopographplaysa
y
largerole,sincethe
original
ore-bearing
zonewillonlybe preserveWhereeros
d
ion
hasnot loweredthelandsurfncetoomuch. Fig.D is a topogrephicap
lrofilealongthelineof thefahlbånd.It shows
how nearlyall theoldworkingsandcertainly
all theimportant
oneslayat or nearthehighestpointsalongthefnhlbånd,
supporting
theideaof sometopographic
controlof theore.
deposition.It,thereforet
doesnot seemlikelythatfurther
worthwhileore-findc
sanbe expected
in the topographical
depressions
alongthefahlbånd.
Thewriteris led quitefirmlyto theconclusion
thatthe
ore-mineralizeti
alongthem
on
ainfahltånd
betweenSkutterud
end thatmost
mines and Svartfjellmine has been "bottomed",
of the ore depositedhas beenremovedby erosionbeneaththe
peneplane.
levelof the sub-Cambrian
Literaturereferences.
geologi.N.G.U.82.
BuggetC.1917.Kongsbergfeltets
MainstrytH.E.1949.MiningGeology.New YorktPrenticeBilltInm.
NeumanntR.1944.Silverdepositaat Kongsberg.N.G.U.162.
omkringModum
I.Th.1949.Noen observasjoner
Rosenquvistt
(Nedl.).N.G.T.27,187-216.
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NORD GRUVE
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MELLOM GRUVE
SØR GRUVE
Da
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„ICIDWIG
Degbrudd
STOLL
Contar.n•
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Antatt lodep ev lineekionen
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C:\ Tegn\P
147septesSer
Vokes\Pig
2004
35.cdr
1Y:07:49
EUGEN STDLL NIVA
MODUM KOBOLT GRUVER
Skutterud Gruvene
Målesfokk
Honsontd og Verukai
50
LENGDE PROFIL S-N
Tegnef elter de gemle gruvekeder og egne observasjoner. sommeren 1956.
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Tegnal orter de ganaa grtnekertea 00 oro obs01~01101:
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