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	THE ???? DATABASE
	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 13.02.2024)

Products

	Element/product	Crude ore grade or quality	Reg. date
	MoS2	0,23 %	13.02.2024

Operations

	From - To	Activity	Comments
	1916 - 1919	Test mining	Company/Institution :A/S Ørnehommen molybdengruber

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Genesis:	Hydrothermal vein	Form:
	Main texture:	Structureless	Min. distribution:	Irregular (scattered)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

	Province:	South Norwegian Basement Province
	Geotec.unit:	Agder Complex
	Tectonic complex:
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Feldspar	Subordinate mineral (1-10%)
	Ore mineral	Molybdenite	Major mineral (>10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Granite	Intrusive Original rock :Granite
			Metamorphic facies :Amphibolite

Information(s) in free text format

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Jelå gruve ligger på nordsida av en kløft ca. 20-30 m lavere i terrenget (770-780 moh) enn en sti som fører fra hyttefeltet og nordover opp langs Geiteryggen. To stoller er anlagt mot nord fra kløfta. Den øverste fører inn til et større bergrom og er ikke tilgjengelig, men 10-15 m under denne er det drevet en stoll med retning 76°. Ved inngangen i sør er en finkornet dolerittgang som følger kløfta og er ca. 15 m bred. I stollen finnes både grå og rødlig porfyrisk granitt. Molybdenglans finnes i en pegmatittisk, 10 cm tykk kvartsgang i den porfyriske granitten og disseminert i grå granitt. Mektigheten til malmsonen er beskrevet å være ca. 10 m med jevn gehalt på 0,23 % MoS2 (Holmsen 1961). En stoll skal være drevet fra Ørnehommen gruve og inn under Jelå gruve og Bugge (1963) omtaler disse gruvene samlet.

Bibliography:

From NGU's Reference Archive:

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.

Holmsen, T. W. , 1961

	Rapport over molybdenglansforekomster i Vestlandske distrikt i området Vest-Agder fylke samt herredene Lund og Sokndal i Rogaland.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 7513;178 pages

Abstract:

Rapporten er ordnet i tre deler. Del 1 gir oversikt over alle mutede skjerp i området (side 4-106). Del 2 gir driftsberetninger hentet fra Norges Bergverksdrift for de skjerp hvor det har vært undersøkelsesarbeid eller regulær drift (side 107-135). Del 3 gir tittel med korte sammendrag av rapporter fra de aktuelle steder som er beskrevet (side 136-158). Side 158-176 består av kartbilag i M 1:50 000. Tittel forts.: ... Rogaland fylke.

Müller, Axel; Henderson, Iain; Jourdan, Charles; Slagstad, Trond , 2016

	Mineralization styles and formation temperatures of the Knaben molybdenum deposits, southern Norway

;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2015.030;59 pages

Abstract:

The report documents the lithologies and molybdenite mineralization exposed in underground mines of the Knaben molybdenum (Mo) mining district in Kvinesdal, Vest-Agder, SW Norway. Scanning electron microscope cathodoluminescence (SEM-CL) and trace element analyses of quartz by laser ablation inductively coupled mass Spectrometry (LA-ICP-MS) were performed on 37 quartz and quartz-bearing samples in order to better understand the P-T conditions during magma emplacement and Mo-mineralization.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JS-W2121	Dump	Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2 Comment: Molybdenite aggregates in quartz-feldspar vein in grey granite No. of registrated element analyses = 1
	JS-W2122	Dump	Sampler: J.S.Sandstad/...Stored: Løkken/...Size(kg): 2 Comment: Molybdenite dissemination/veinlets in grey granite No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

Name of Locality: Ruben gruve

(Object Id: 38441 28,01,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Fjotland (1412-3)

Map 1:250000:

Mandal

County:

UTM-Zone 33 - EUREF89/WGS84

Resource

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

Resources and production

	Activity:	Test mining	Reserves:
	Operating method:	Underground mining	Historical production:

Information(s) in free text format

Free text

Ruben gruve er drevet på samme nivå som øvre stoll i Jelå gruve på sørsida av kløften. Ved befaring i juni 2021 var gruva fylt med snø og ikke tilgjengelig.

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The fact sheet was created on 08.05.2024

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