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THE ORE DATABASE
Occurence 5610 - 005 Gorrzejohka
(Object Id: 698)
(Last updated: 15.02.2005)
Location
County: Finnmark Municipality: Kárášjohka (5610)
Map 1:50000: Galmatskai'di (2033-2) Map 1:250000: Karasjok
Coordinate system: EU89-UTM Zone 35
East: 438626 m. North: 7669017 m.
Longitude: 25.4565750 Latitude: 69.1245080
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Mineralization
Era: Cenozoic Period: Quarternary
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%)

Lithology:
Relationship Rock Origin
Wall rock Amphibolite Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite

Information(s) in free text format
Free text
Thesen gold field is named after Gudbrand Thesen. Work was initiated in the 1870ties. The main gold field several hundred metres long is situated in a 5 m high terrace on the eastern side of Gorzzejohka river opposite the confluence with Vuzzuljohka river (Bjørlykke, 1966). The shallow workings occur in sandy gravel rich in boulders. Another gold field is situated about 700 m northeast of the confluence on the northern side of Gorrzejohka river. 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.

The fact sheet was created on 29.04.2024
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