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	MALMDATABASEN
	Forekomstområde 2021 - 010
	(Sist oppdatert 15.feb.2005)

Betydning

Offentlig:

Liten betydning (reg. 18.02.2015)

Økonomisk:

Lite viktig , (Stadfestet 08.feb.2005 av Peter Ihlen)

Mineralisering

	Æra:	Kenozoikum	Periode:	Kvartær
	Datering:		Metode:
	Genese:	Klastisk sediment	Form:	Uregelmessig
	Hovedtextur:	Poreromsfylling	Min. fordeling:	Uregelmessig

Kornstørrelse:

Meget ujevnkornet

Hovedomvandling:

	Strøk/Fall:		Retning:
			Feltstupning:

Stratigrafisk klassifikasjon av vertsbergart

Æra:

Periode:

	Provins:
	Geotek.enhet:
	Tektonisk complex:
	Intrusivt komplex:

Gruppe:

Formasjon:

Mineralogi

	Relasjon	Mineral	Mengde
	Malmmineral	Gull	Hovedmineral (>10%)

Opplysning(er) i fritekstformat

Sammendrag

The gold camp is situated about 100 m east of Gorrzejohka river on a small plateau 5 m above the river. The bedrocks comprised by light grey granodiorites, form two large outgrop areas. Gold has been extracted from fluvial sand filling clefts in loose and deeply weathered bedrocks on the northern side of the southern outcrop area and from alluvial material filling a depression between the two outcrop areas. further to the north before the next outcrop area. The panned material is rather coarse-grained containing abundant fragments of the granodiorites (Bjørlykke, 1966). The panned sediments from clefts in the bedrocks are of fluvial origin whereas those in the lower-lying depression mostly represent ice-lake deposits (J. Corner, pers. comm., 1983). In 1982-83 Norsk Hydro investigated the old gold camps along the Gorrzejohka river. The company concluded that the gold was not of local origin, but was transported into the area by intra- and post-glacial river systems. About 100 samples containing sulphides and/or hydrothermal alteration were collected from outcrops and from boulders in the river bed. Sulphidic meta-cherts were one of the dominant rock types. All of the samples contained less than 80 ppb gold (T. Vrålstad, pers. comm., 1983).

Litteraturfortegnelser:

Fra NGU's Referansearkiv.:

Bjørlykke, Harald , 1966

	De alluviale gullforekomster i indre Finnmark.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.236;1-66 sider

Abstrakt:

The first find of alluvial gold in Finnmarken was made by inspector (bergmester) Tellef Dahll in 1866 in sand from a small river named Nitusjokka near Karasjok. During the following 5 years gold deposits were found in all the rivers of the Tana river systm and the Alta and Reisa rivers. Gold has been found in small amount in all kinds of sand- and gravel deposits and also in the unwashed moraine deposits. The gold fields which have been subject to production or prospection work are situated at the upper parts of the rivers. The occurrences of alluvial gold in Finnmark may be classified in The following way: 1. Preglacial accumulations undisturbed by ice erosion during the ice age. 2: Preglacial accumulations disturbed and redeposited in moraines and fluvioglacial deposits. 3. Accumulations in postglacial river beds. The gold in these deposits seems chiefly to have been washed out from the moraines. Mineralogical analyses of the mineral composition of the gold-bearing sand and gravel have been carried out. The minerals of the gold-bearing deposits may be divided in two groups: 1. Minerals belonging to the surrounding solid rock. 2. Minerals which do not seem to belong to the solid rock in the neighbourhood of the deposits.

Navn på lokalitet : Øvre Jentoft

(Objekt Id : 2021,010,01,00)

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Lokalisering

Fylke :

Finnmark (20)

Kommune :

Karasjok (2021)

Kart 1:50000:

Galmatskai'di (2033-2)

Kart 1:250000:

Karasjok

Markeringspunkt:

Lengdegrad:

25.3794130

Breddegrad:

69.0900520

EU89-UTM Zone 35

X-koord:

435457 m.

Y-koord:

7665256 m.

Materialtype

	Hovedtype:	Edelmetaller (Au, Ag, PGE)	Subtype:	Gull
			Element(er):	Au

Produksjon

	Aktivitet:	Gruvedrift	Reserver:
	Prod. metode:	Dag- og underjordsdrift	Produksjon:
	Prod. status:	Nedlagt	Tippvolum:

Mineralogi

	Relasjon	Mineral	Mengde
	Malmmineral	Gull	Hovedmineral (>10%)

Opplysning(er) i fritekstformat

Sammendrag

The workings is situated in a large fluvial deposit of gravel of sand on the northwestern side of Gorrzejohka river about 1.5 km southwest of the main Jentoft gold camp. The fluvial deposits occur in two stair shaped terraces at 6-8 m and about 10 m above the river. Remnants of two shafts reinforced with timber can found. The one at the lower terrace about 50 m from the river is 6-7 m deep, whereas the one on the upper terrace situated 60 m from the river is 4 m deep (Bjørlykke 1966). The auriferous material that was mined, was probably derived from the interface between undisturbed till and overlying fluvial deposits or from clefts in the sub-surface bedrocks. Outcrops of the amphibolitic bedrocks on the opposite side of the river carry gold in fluvial materiale filling clefts in the bedrocks 1-2 m above the river.

Litteraturfortegnelser:

Fra NGU's Referansearkiv.:

Bjørlykke, Harald , 1966

	De alluviale gullforekomster i indre Finnmark.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.236;1-66 sider

Abstrakt:

The first find of alluvial gold in Finnmarken was made by inspector (bergmester) Tellef Dahll in 1866 in sand from a small river named Nitusjokka near Karasjok. During the following 5 years gold deposits were found in all the rivers of the Tana river systm and the Alta and Reisa rivers. Gold has been found in small amount in all kinds of sand- and gravel deposits and also in the unwashed moraine deposits. The gold fields which have been subject to production or prospection work are situated at the upper parts of the rivers. The occurrences of alluvial gold in Finnmark may be classified in The following way: 1. Preglacial accumulations undisturbed by ice erosion during the ice age. 2: Preglacial accumulations disturbed and redeposited in moraines and fluvioglacial deposits. 3. Accumulations in postglacial river beds. The gold in these deposits seems chiefly to have been washed out from the moraines. Mineralogical analyses of the mineral composition of the gold-bearing sand and gravel have been carried out. The minerals of the gold-bearing deposits may be divided in two groups: 1. Minerals belonging to the surrounding solid rock. 2. Minerals which do not seem to belong to the solid rock in the neighbourhood of the deposits.

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Faktaarket ble generert 09.05.2024

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