Fact Sheet for <b>Occurence 4003 - 038 GJÆRUMTJERN</b>

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	THE ORE DATABASE
	Occurence 4003 - 038 GJÆRUMTJERN
	(Object Id: 5592) (Last updated: 30.06.2022)

Location

County:

Telemark

Municipality:

Skien (4003)

Map 1:50000:

Kilebygd (1713-3)

Map 1:250000:

Skien

Coordinate system:

EU89-UTM Zone 32

East:

521835 m.

North:

6563458 m.

Longitude:

9.3823830

Latitude:

59.2096440

Show on map

Resource

	Resource Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Resource Subtype:	Molybdenium
			Element(s):	Mo

Importance

Raw material meaning:

Not Assessed (reg. 18.02.2015)

Mineralization

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Stratigraphic classification of host rock

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Information(s) in free text format

Free text

I følge Larsen (1993) danner en linseformet grovkornig granittpegmatitt i en finkornig granittisk gneis, en langstrangt kolle i terrenget. Molybdenglans opptrer som små flak, sparsomt fordelt i pegmatittmassen. Karakteristisk for pegmatitten er dm-store, grove hornblenekrystaller. Den ble mutet i 1916 og ble navngitt Bergans gruve. Det er sprengt flere steder i SØ-enden av pegmatittkollen, over en strekning på ca 25 m. Anslagsvis er noen få m^3 sprengt ut. Foslie (1925) betegner den som Gjærumtjern skjerp.

Bibliography:

From NGU's Reference Archive:

Larsen, Alf Olav , 1993

Gruver og skjerp i Skien.

;Forfatteren;BOK;72 s. pages

Larsen, Alf Olav , 1993

Gruver og skjerp i Skien

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 7706;72 pages

Foslie, Steinar , 1925

Syd-Norges gruber og malmforekomster.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.126;1-89 + ka pages

Abstract:

On the map accompanying this paper all the mines and ore deposits of Southern Norway are collected for the first time.The material has been gathered from printed and unprinted sources, communications from mining engineers and geologists, and through personal visits. Included are all mines and ore deposits of former, present and future importance. Among the 1407 deposits on the map, there are furthermore included all of doubtful value and many which are quite unworkable, but of geological interest, or those which mark the distribution of ore bearing formations. For this reason it has been necessary to mark the deposits with signs of different size. The object is only to facilitate a comprehensive view of the map, and is not an effort of economic classification, which for most of them would be quite impossible. The sizes refer to the presumed importance of the ore deposit, and has nothing to do with the extent of the mining operations. Mines and deposits out of work during the period 1913-1923 have been separately marked (see the legend), also deposits which were formerly of much greater importance than now. For the smallest mines and deposits no distinction has been made in these respects. Among them are represented partly those, which are in reality unworkable, partly those which are little investigated.

Bugge, Arne , 1963

Norges molybdenforekomster.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.217;1-134 pages

Abstract:

The ore fields and individual deposits which are mentioned in the text are shown on the map, figure 2. For those areas where the deposits lie so close together that they cannot be shown separately on this map, detail maps have been drawn on larger scales. In the descriptions there will also be found special maps covering the most important molybdenum areas. An index of the deposits which are mentioned is arranged both alphabetically and according to the numbers on the map. The majority, including the most important, of the ore deposits in Southern Norway lie within a marked zone, which is shown on the map, figure 3. At varying periods of time different metals have characterised the long zone of ore deposits: titanium in the southwest, then molybdenum in the area from Gursli to Knaben, copper and molybdenum in Telemark, silver, zinc and lead from Kongsberg eastwards, and further to the east, molybdenum again. From the map, figure 4, it can be seen that the most important groups of deposits are situated to both sides of the granite-gneiss area of the mountanious region of Southern Norway and that they lie in migmatised gneisses along the southwest side and in the schists and quartzites of the Telemark supracrustal suite along the northeast side.

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