Norsk versjon
	THE ORE DATABASE
	Deposit Area 2021 - 010
	(Last updated 15.feb.2005)

Importance

Public:

Little Importance (reg. 18.02.2015)

Economical:

Minor interest , (Confirmed 08.feb.2005 by Peter Ihlen)

Mineralization

	Era:	Cenozoic	Period:	Quarternary
	Dating:		Method:
	Genesis:	Clastic sediment	Form:	Irregular
	Main texture:	Pore space filling	Min. distribution:	Irregular (scattered)

Main grain size:

Very unevenly grained

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Period:

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Ore mineral	Gold	Major mineral (>10%)

Information(s) in free text format

Abstract

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).

Bibliography:

From NGU's Reference Archive:

Bjørlykke, Harald , 1966

	De alluviale gullforekomster i indre Finnmark.

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

Abstract:

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.

Name of Locality : Øvre Jentoft

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

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Location

County :

Finnmark (20)

Municipality :

Karasjok (2021)

Map 1:50000:

Galmatskai'di (2033-2)

Map 1:250000:

Karasjok

Marking point:

Longitude:

25.3794130

Latitude:

69.0900520

EU89-UTM Zone 35

X-coord:

435457 m.

Y-coord:

7665256 m.

Commodity

	Main Type:	Precious metals (Au,Ag,PGE)	Sub Type:	Gold
			Element(s):	Au

Production

	Activity:	Mining	Reserves:
	Prod. method:	Open pit and underground mining	Production:
	Prod. status:	Disused, closed	Volume of dump:

Mineralogy

	Relationship	Mineral	Amount
	Ore mineral	Gold	Major mineral (>10%)

Information(s) in free text format

Abstract

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.

Bibliography:

From NGU's Reference Archive:

Bjørlykke, Harald , 1966

	De alluviale gullforekomster i indre Finnmark.

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

Abstract:

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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The fact sheet was created on 18.05.2024

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