Norsk versjon
	THE ORE DATABASE
	Deposit Area 237 - 003
	(Last updated 02.okt.2019)

Importance

Public:

Not Assessed (reg. 18.02.2015)

Economical:

Not classified/evaluated

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:		Method:
	Genesis:	Hydrothermal vein	Form:	Plate
	Main texture:	Fracture filling	Min. distribution:	Irregular (scattered)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

Sericitisation

	Strike/Dip:	176 / 90	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Paleoproterozoic

	Province:	East Norwegian Basement Province
	Geotec.unit:	Solør Complex
	Tectonic complex:	Mylonite Zone
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Sericite	Subordinate mineral (1-10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Hematite	Subordinate mineral (1-10%)
	Ore mineral	Gold	Accessory mineral (<1%)

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fault plane	Strike/Dip :5 / 90	Syn-mineralisation ;...Effect :Controls
	Host rock	Foliation	Strike/Dip :154 / 75	Pre-mineralisation ;...Effect :None

Information(s) in free text format

Free text

The Guldkis mine represents the discovery site for the first gold found in the Gullverket or Eidsvoll mining field. The mine was, like many in the Eidsvoll-Odal district, originally worked by Odal Copperworks during the period 1710-1740 (Falck-Muus 1924). In 1757 visible gold was found in one of the old workings in Guldkis mine and in the subsequent year a number of the abandoned copper mines were reopened for gold production (Bradt 1790, Keilhau 1836). During the whole mining period gold was extracted metallurgically from hand-cobbed pyritic ores and later from concentrates at Kongsberg in conjunction with the silver production. The total amount of gold that was produced is unknown. The mine is situated 100 m east of the Knofsløkka farm which represented the headquarter for the mining activity in the early years. Presently the mine comprise two water-filled shafts and one 15 m long adit situated at the western side and near the bottom of a small NNW-SSE-trending valley eroded out along a fault bifurcating from the major N-S trending Holsjøene fault zone shortly south of Røysivangen mine . A third shaft which have collapsed is situated 20 m west of the adit and adjacent to the dirt road leading to Lesja, Røysivangen, Fremmingvangen and Brustad mines. The workings is situated inside an up to 5 m wide vein of massive fine-grained milky quartz surrounded by brick-red clay-altered megacrystic gneiss granite. The steeply dipping vein strikes N5E, i.e. at an angle to the fault in the valley. At the entrance of the adit the main vein shows a NE-trending and 2 m wide branch. The exposed parts of the veins contain no visible sulphides with the exception of accessory pyrite and chalcopyrite occurring locally in the gneisses along the vein contact and in occasional fragments of sericite-altered gneisses in the vein, e.g. at the bottom of the adit. However, according to descriptions by Bradt (1790) and Keilhau (1836), as well as maps in Bradt (1790) the southern and northern shaft in the valley was driven along several thin (10-20 cm wide) auriferous sulphide-rich veins down to depths of about 20 m and 35 m, respectively. The auriferous veins, which extends for about 30 m carry locally visible gold. The cross-cut the main quartz vein in an E-W direction. The gold mineralisation in the Guldkis mine is typical for the deposits in the Eidsvoll mining field, being characterised by gold-enrichment only in association with pyrite-bearing parts of the quartz veins.

Bibliography:

From NGU's Reference Archive:

Keilhau

	Om Eidsvoll Guldverk.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1433;8 pages

	Abstract:
	Rapporten handler om Græsli grubene, Guldkisgruven, Sondergruvene og skjerp no. 4. Rapporten omhandler tidligere drift, forekomtenes opptreden og geologi. Rapporten er skrevet for hånd.

Brandt, Ivar , 1940

	Skriv til Reichskommisariat, Wirtschaftsabt., Berg, Grube und Bodenforschung, Oslo angående Eidsvoll gullverk.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3604;2 pages

Abstract:

Jeg er klar over at gullet muligens har utspilt sin rolle som betalinsmiddel, men at det for tiden også er et stort udekket behov til teknisk bruk. Gruvene ved Eidsvoll formodes å inneholde mellom 10 og 15 g. gull pr. tonn og skulle derfor være drivverdige. Gruvene er ifølge Kelhau (1936) h.h.v. 62 og ca. 20 m. dype med flere mindre stoller på hovedgangene. Gangbredden er 4 - 6 m. Bergarten er rødkvarts. Det finnes 5 mindre gruver i den nærmeste omegn. I en sandprøve anslo jeg gullinnholdet til 1 - 2 g. pr. tonn. Kjemiske analyser viser spor av edle metaller. Rent gull vil med grunnvann og regn forskyve seg nedover og befinne seg i de undre gruslag i betydelig større mengde enn i overflaten.

Ihlen, Peter M. , 1983

	Befaringer av malmforekomster i Eidsvoll og Nord-Odal kommuner 1983

;Norsk Hydro / NGU;RAPPORT;NH-arkivet; No.NH 6B;18+bilag pages

	Abstract:
	Rapporten beskriver de forskjellige hovedtyper av malmer og mineraliseringer i Eidsvoll og Nord-Odal kommuner som ble befart. Befarte gruver: Brustad, Sander, Guldkis, Antoinette, Storgruven, Trøft-gruven og Føskersetergruven.

References not to be found in NGU's Reference Archive.:

Bradt, D. E. (1790) «Om guldværket i Eidsvold i Norge 1781, med tillæg om hvad derved til 1789 aars udgang videre er foretaget», Minerva, København. Faksimile 1967. https://www.nb.no/items/2c817a6c8348733c7be3d8fe03d62e4b

Keilhau, B. M. (1836) «Om det forrige Guldverk i Eidsvold» Magazin for Naturvidenskaberne. Andet bind. Den physiographiske Forening i Christiania. Johan Dahl (redaktør).

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The fact sheet was created on 22.11.2024

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