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	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 01.07.1998)

Operations

	From - To	Activity	Comments
	1983 - 1984	Geophysics	Company/Institution :Folldal Verk A/S
	1984 - 1984	Geochemistry	Company/Institution :Folldal Verk A/S
	1984 - 1985	Sampling	Company/Institution :Folldal Verk A/S
	1984 - 1985	Geology	Company/Institution :Folldal Verk A/S
	1987 - 1987	Sampling	Company/Institution :NGU-Malmreg.

Mineralization

	Genesis:	Volcex	Form:	Layer
	Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

Sericitisation

	Strike/Dip:	350 / 60	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	Quartz	Major mineral (>10%)
	Gangue mineral	Feldspar	Subordinate mineral (1-10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Subordinate mineral (1-10%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)
	Ore mineral	Chalcopyrite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Biotite schist	Sedimentary Original rock :Greywacke
			Metamorphic facies :Greenschist
	Wall rock	Greenschist	Extrusive Original rock :Tuff
			Metamorphic facies :Greenschist
	Wall rock	Sericite schist	Sedimentary Original rock :Tuffite
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :350 / 60	Post-mineralisation ;...Effect :None

Information(s) in free text format

Description

Folldal Verk A/S / Amoco utførte i 1983 regionale geofysiske helikoptermålinger 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 II er et lite skjerp (1 m3 tipp) i skrent i sørkanten av ei myr. I skjerpet ses en ca. 30 cm mektig finkornig, massiv svovelkis-mineralisering, med et 5 cm mektig magnetkis-dominert lag langs hengkontakten. I mineraliseringen er små kvartsøyne vanlig. Det er enkelte glideplan /-speil i mineraliseringen, som løper parallelt med dens sidesteinskontakter. Hengbergart er finkornig biotittskifer, mens serisittskifer er liggbergart. Mineraliseringen kan pga. overdekning ikke følges langs strøket, men 300 m mot NNØ og få meter vest for bekken fra Bergstjern, er det et lite (<1 m3 tipp) skjerp (1) i det som antas å være omlag samme nivå som forrannevnte skjerp. Skjerpet er vannfylt og gjenrast og observasjoner er vanskelig å gjøre. Det er noe svovelkis-disseminasjon i kvarts-feltspatbåndet grønnskifer. Formen på skjerpet minner om fyrsetting.

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
	ST0318.01	Bedrock	Sampler: Wilberg/...Stored: Løkken Comment: Massiv fink. py-min. No. of registrated element analyses = 1

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

Name of Locality:

(Object Id: 10110 37,01,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Innset (1520-2)

Map 1:250000:

Røros

Coordinate system:

UTM-Zone 33 - EUREF89/WGS84

East:

556190 m.

North:

6952320 m.

Longitude:

10.0995400

Latitude:

62.6974300

Show on map

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Sulphides
			Element(s):	Kis

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The fact sheet was created on 08.05.2024

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