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THE ORE DATABASE | |||||
Occurence 5610 - 011 Noai'datjav'ri | |||||
(Object Id: 743) (Last updated: 15.02.2005) |
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Location |
County: | Finnmark | Municipality: | Kárášjohka (5610) |
Map 1:50000: | Iesjåkka (2033-4) | Map 1:250000: | Karasjok |
Coordinate system: | EU89-UTM Zone 35 |
East: | 418437 m. | North: | 7689806 m. |
Longitude: | 24.9315770 | Latitude: | 69.3055110 |
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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: | Mining | Reserves: | ||
Operating method: | Open pit mining | 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 | |
Gangue mineral | Garnet | Major mineral (>10%) | |
Gangue mineral | Zircon | Subordinate mineral (1-10%) | |
Ore mineral | Titanomagnetite | Major mineral (>10%) | |
Ore mineral | Gold | Accessory mineral (<1%) |
Information(s) in free text format |
Abstract |
The deposit is situated on the northern side of Karasjohka river at immediately south of vuolit Noai'datjavri and 50-100 m inland from the riverbank. Gravel and sand with large boulders forming the top layer of a terrace situated 6-8 m above the river, has been worked over an area of 2-3 Da. According to Bjørlykke (1966) about 1-2 kg gold including up to 2 gram nuggets, was produced from the sand and gravel containing about 0.7-0.8 g Au/m3. The gold is enriched along the interface between the sand and gravel in the reworked till and undisturbed blocky till. Rich pockets of gold occur at the lee side of big boulder in the former river bed (Bjørlykke, 1966). |
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 03.05.2024 |
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