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	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 08.05.2006)

Operations

	From - To	Activity	Comments
		Pitting	Company/Institution :?
	1990 - 1993	Detail mapping	Company/Institution :T. Bjerkgård, University of Oslo
	1999 - 1999	Sampling	Company/Institution :NGU mineralressurser

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Genesis:	Volcex	Form:
	Main texture:	Banded	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

Silicification

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

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

Group:

Fundsjø

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Amphibole-chlorite schist	Extrusive Original rock :Basalt
			Metamorphic facies :Greenschist
	Wall rock	Banded chlorite schist	Sedimentary Original rock :Tuffite
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :251 / 58	Post-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Det er to skjerp like ved hverandre i åpen furuskog på vestsiden av Storhovda. Det nederste skjerpet er en røskegrøft, ca. 5 m på tvers av strøket, 1.5 m bred og inntil 1 m dyp. Grøfta er i stor grad gjengrodd. Hovedskjerpet ligger ca. 25 m lenger mot NV langs strøket og er en grop 4 m langs strøket, 3 m bred og inntil 1.5 m dyp. Tippvolumet er omlag 20 kbm (gjengrodd). Mineralisering i begge skjerpene består av svak impregnasjon i streker av magnetkis i meget finkornet kvartsbergart, en chert. Mineraliseringen ligger på kontakten mellom en grønnstein (metabasalt) og en båndet klorittskifer (tuffitt).

Bibliography:

From NGU's Reference Archive:

Page, Norman J. , 1964

	The sulphide deposit of Nordre Gjetryggen Gruve, Folldal, Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.228;217-269 pages

Abstract:

Nordre Gjetryggen Gruve in the Folldal district, southern Norway, is at approximately 62 9'N. latitude and 10 E. longitude. The mining of copper from pyritic ores began in the area in 1748, while the recovery of zinc and sulphur became important in the 19th century, Nordre Gruve alone yielded 1,1 million metric tons of raw ore before 1957. From then until 1962 it produced about 65 thousand tons of raw ore per year. The mine has been developed for about 420 meters along the strike of N.42 E. and to a depth of 510 meters. The ore body dips 38 NW. in the western part and between 45-50 NW. in the eastern part; the ore zone plunges 45 NE. The average thickness of the ore is 1,66 meters. Geologically, the district is in the southwestern part of the Trondheim region near the Sparagmite boundary and Nordre Gruve can be cosidered to be on the southwest limb of a northeasterly plunging syncline composed of schists in the quartz-albite-epidote-almandine subfacies of the greenschist facies that have been assigned tentatively to rock units similar to those in the Hølonda-Horg district. The rock units mapped are: 1) undifferentiated schists composed dominantly of quartz, chlorite, calcite, biotite, epidote, and hornblende; 2) quartzite schists; 3) hornblende-quartz schist; and 4) trondhjemite now albite-quartz-garnet gneiss, and surficial material.

Bjerkgård, Terje , 1995

	The stratabound massive sulfide deposits in the Folldal area, southern Trondheim region Caledonides, Norway.

;UiO Geologisk fellesråd;AVHANDLING

Bjerkgård, Terje; Bjørlykke, Arne , 1994

	The stratabound sulphide deposits in the Folldal area, Southern Trondheim Region, Norway

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.74 (4);213-237 pages

Abstract:

Frie emneord: Lagdelt, Malmgenese Five strata-bound massive sulphide deposits are situated at three different stratigraphic levels in the volcanogenic Fundsjø group in the Folldal area. The deposits are hosted in metabasalts, metarhyodacites and volcanoclastic rocks and belong to the Cu-Zn class of volcanic-associated massive sulphide deposits. The metal content of the deposits indicates that the sources of metals are underlying strata, possibly with a contribution from intrusives. Wall rock alteration varies according to differences in host rocks, and is probably a result of chemical variations of the host rocks, temperature differences and proximity to the hydrothermal vent. The clustering of deposits in the Folldal area is considered to be due to the occurrence of a large sub- volcanic trondhjemitic intrusion which acted as the major heat engine for convection. The small size of the deposits might be related to the shallow level of the intrusion.

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

Bjerkgård, T. & Bjørlykke, A. 1995: Geology of the Folldal area, southern Trondheim Region Caledonides, Norway. NGU bull. 426, p.53-75.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	HE0066.01	Bedrock	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Weak dissemination of finegrained streaks of pyrrhotite in chert. No. of registrated element analyses = 1

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

Name of Locality: Storhovda

(Object Id: 12405 11,01,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Folldal (1519-2)

Map 1:250000:

Røros

Coordinate system:

UTM-Zone 33 - EUREF89/WGS84

East:

555100 m.

North:

6890700 m.

Longitude:

10.0569120

Latitude:

62.1427680

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Resource

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

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Information(s) in free text format

Free text

Skjerp består av en liten grop, ca. 1 m langs strøket, 1.5 m på tvers og 0.5 m dyp. Mineralisering består av svært rusten klorittskifer, og antakelig består den av magnetkis.

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The fact sheet was created on 04.05.2024

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