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	MALMDATABASEN
	Forekomstområde 1635 - 026
	(Sist oppdatert 01.jul.1998)

Betydning

Offentlig:

Not Assessed (reg. 18.02.2015)

Economical:

Ikke vurdert

Operations

	From - To	Activity	Comments
	1983 - 1984	Geochemistry	Company/Institution :Folldal Verk A/S
	1983 - 1985	Geophysics	Company/Institution :Folldal Verk A/S
	1984 - 1985	Sampling	Company/Institution :Folldal Verk A/S
	1984 - 1985	Geology	Company/Institution :Folldal Verk A/S
	1997 - 1997	Sampling	Company/Institution :NGU-Malmreg.

Mineralization

	Era:		Period:
	Dating:		Method:
	Genesis:	Vulkeks	Form:	Lag
	Main texture:	Båndet	Min. distribution:	Semi-massiv

Main grain size:

Finkornet (<1 mm)

Main alteration:

	Strike/Dip:	5 / 50	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Period:

	Province:	Caledonides
	Geotec.unit:	Trondheim Nappe Complex
	Tectonic complex:	Støren Nappe
	Igneous complex:

Group:

Støren

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Feldspar	Major mineral (>10%)
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Amphibole	Subordinate mineral (1-10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Accessory mineral (<1%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Quartz keratophyre	Extrusive Original rock :Tuff
			Metamorphic facies :Greenschist
	Wall rock	Amphibole schist	Sedimentary Original rock :Tuffite
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :5 / 50	Post-mineralisation ;...Effect :None

Opplysning(er) i fritekstformat

Beskrivelse

Folldal Verk A/S / Amoco utførte i 1983 regionale geofysiske helokoptermålinger i området, som i 1984-85 ble fulgt opp med detaljundersøkelser mellom Nyberget gruve og Bergstjern. Stikningsnett ble opprettet, fulgt av geologisk detaljkartlegging, geofysiske målinger (VLF, Mag, CEM), fastfjell- og jordprøvetaking. Bergstjern I ligger like vest for nordenden av Bergstjern. Mineraliseringen er undersøkt med ei 10 x 3 m2 stor strosse med synk. Hele skjerpet er vannfylt og vanskelig tilgjengelig. Mot kontakten til overliggende amfibolskifer er det i kvartskeratofyr tre opptil 10 cm mektige konkordante lag av massiv magnetkis-svovelkis-mineralisering over en mektighet på ca. 60 cm. Finkornig magnetkis er dominerende sulfid, men i enkelte bånd er det også endel svovelkis, da som 1 - 2 mm store korn. Mineraliseringens utstrekning er ukjent pga. overdekning.

Bibliography:

From NGU's Reference Archive:

Nilsen, Odd , 1978

	Caledonian sulphide deposits and minor iron-formations from the southern Trondheim region, Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.340;35-85 + k pages

Abstract:

Within the southern and central parts of the Trondheim region of the Norwegian Caledonides a great number of small, stratabound cupriferous pyrite deposits are confined to mafic metavolcanics of the Gula, Støren and Fundsjø Groups of the Lower Palaeozoic succession. The deposits occuring within, or in close contact with the metavolcanics are characterized by their association with minor manganiferous oxide/silicate iron-formations - better known as "vasskis" ore type - within the metamorphic low-grade areas. The iron-fprmations of the metamorphic higher grade terrains on the other hand, which are extensively developed within the Gula Group, are mostly of a pyrrhotitic sulphide/silicate type and sulphurization processes are thought to have played an important role during the metamorphism. The pyrite deposits occurring adjacent to the metavolcanics bear no relationship to the iron-formations. They are embedded in pelitic, often carbonaceous assemblages (Gula Group) or within tuffitic members of the volcanogene Støren Group, and they are thought to represent re-sedimented (reworked) deposits. The pyrite deposits display varying degree of metamorphic reconstitution and a tectonic control has apparently determined their disc- or ruler-shaped morphology.

References not to be found in NGU's Reference Archive.:

Bakke, O. 1984: Oppdal project. Intern rapp. Folldal Verk A/S. BV 3018

Bakke, O. 1984: Oppdal prosjekt. Intern rapp. Folldal Verk A/S. BV 3019

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	ST0337.01	Dump	Sampler :Wilberg/...Stored :Løkken Kommentar :Semimassiv po-min. i silifisert grønnskifer No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

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Analyse Results

from

Forekomstområde 1635 - 026 Bergstjern I

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
ST0337.01	Dump	228	271	5	-1	64	-.3	5.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
ST0337.01	-1.0	-1.0	47	.4	-1	6.00	5	-3	13.80

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Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
ST0337.01	46	16	1994	26.03	6.00	-8.00	3	42.0	11.00

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Sample No.	B*
ST0337.01	-3

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Faktaarket ble generert 13.06.2026

Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no

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