English version
	MALMDATABASEN
	Registrering 5610 - 015 Storfossen
	(Objekt Id: 749) (Sist oppdatert: 15.02.2005)

Mineralisering

	Æra:	Kenozoikum	Periode:	Kvartær
	Genese:	Klastisk sediment	Form:	Uregelmessig
	Hovedtekstur:	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
	Gangmineral	Amfibol	Hovedmineral (>10%)
	Gangmineral	Granat	Underordnet mineral (1-10%)
	Gangmineral	Zirkon	Underordnet mineral (1-10%)
	Malmmineral	Hematitt	Hovedmineral (>10%)
	Malmmineral	Titanomagnetitt	Hovedmineral (>10%)
	Malmmineral	Svovelkis	Hovedmineral (>10%)
	Malmmineral	Scheelitt	Aksessorisk mineral (<1%)
	Malmmineral	Rutil	Aksessorisk mineral (<1%)
	Malmmineral	Gull	Aksessorisk mineral (<1%)
	Malmmineral	Sperrylitt	Aksessorisk mineral (<1%)
	Malmmineral	Sølv	Aksessorisk mineral (<1%)

Opplysning(er) i fritekstformat

Sammendrag

The deposit is situated near the southeastern bank of Karasjohka river about 500 m southwest of the old cabin at Gål'lebai'ke. Several pits have been developed in the Quarternery deposits around the cabin and southwestwards for about 600 m. The deposits are less than 0.5-1.5 m thick in areas where the bedrocks are reached (Bjørlykke 1966). The terrace consists of a top layer of alluvial sand rich in gold followed downwards by a 0.5-0.6 m thick unit of sand and gravel with large boulders nearly barren in gold. The best gold concentrations occur at the interface with the underlying undisturbed clay-rich blocky till. Strong gold enrichment is also encountered in the bottom of small depressions in the underlying bedrocks where the reworked unit of till is deposited directly on the bedrocks. The gold-rich top layer is assumed formed by alluvial redistibution of gold from the interface between reworked and undisturbed till. In 1966 about 5 kg of gold have been produced from the terrace which is estimated to contain 0.8-0.9 g gold per m3 of sand (Bjørlykke 1966).

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 19.04.2024

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