Fact Sheet for Deposit Area 1037

					Norsk versjon
	THE ORE DATABASE
	Deposit Area 1037 - 028
	(Last updated 13.feb.2024)

Name of Deposit Area : Jelå gruve

(Object Id : 1037,028,00,00)

Location

County :

Vest-Agder (10)

Municipality :

Kvinesdal (1037)

Map 1:50000:

Fjotland (1412-3)

Map 1:250000:

Mandal

Marking point:

Longitude:

7.0692470

Latitude:

58.6759370

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

388043 m.

Y-coord:

6505579 m.

Commodity

	Main Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Sub Type:	Molybdenium
			Element(s):	Mo

Production

Activity:	Test mining	Reserves:
Prod. method:	Underground mining	Production:
Prod. status:		Volume of dump:

Importance

Public: Not Assessed (reg. 18.02.2015)

Economical: Not classified/evaluated

Products

Element/product Crude ore grade or quality

MOS 0,23 %

Operations

From - To Activity Comments

1916 - 1919 Test mining Company/Institution :A/S Ørnehommen molybdengruber

Mineralization

Era: Proterozoic Period: Neoproterozoic

Dating: Method:

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

Free text

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 : 1037,028,01,00)

Location

County : Vest-Agder (10) Municipality : Kvinesdal (1037)

Map 1:50000: Fjotland (1412-3) Map 1:250000: Mandal

Marking point: (Unavailable)

Commodity

Main Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Sub Type: Molybdenium

Element(s): Mo

Production

Activity: Test mining Reserves:

Prod. method: Underground mining Production:

Prod. status: Disused, closed Volume of dump:

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.

Analyse Results

from

Deposit Area 1037 - 028 Jelå gruve

Element analyses
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)

Sample No. Sample Type Cu* Zn* Pb* Co* Ni* Ag* Au#

JS-W2121 Dump 231 21 19 2 4 .3 1.0

JS-W2122 Dump 324 32 28 3 6 .4 -1.0

------------------

Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*

JS-W2121 -5.0 -1.0 1 .3 320 24400.00 1 0 0

JS-W2122 -5.0 -1.0 1 .2 530 12250.00 1 0 0

------------------

Sample No. Se* Ga* Ge* In* S% V* Cr* Mn* Fe%

JS-W2121 8.00 10.30 0.09 0.03 1.76 27 7 194 1.10

JS-W2122 5.00 16.60 0.09 0.04 .93 20 10 279 1.19

------------------

Sample No. Th* U* W* Rb* Sr* Y* Zr* Nb* Ta*

JS-W2121 10.25 3.00 2 152.5 77.4 5.0 129 5.70 0.26

JS-W2122 14.00 2.30 1 232.0 146.0 5.5 150 6.40 0.28

------------------

Sample No. Cs* La* Ce* Li* Be* Na* Mg* Al* P*

JS-W2121 0.69 18.40 35.40 16 1 9800 1100 33000 130

JS-W2122 1.02 24.80 44.90 20 2 17800 1400 53900 190

------------------

Sample No. K * Ca* Sc* Ti* Te* Hf* Re* Tl*

JS-W2121 22700 3000 1.50 860 0.95 4.20 1 1

JS-W2122 35400 6300 1.70 1070 0.54 4.70 0 2

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

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

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

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

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

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
JS-W2121	Dump	231	21	19	2	4	.3	1.0
JS-W2122	Dump	324	32	28	3	6	.4	-1.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
JS-W2121	-5.0	-1.0	1	.3	320	24400.00	1	0	0
JS-W2122	-5.0	-1.0	1	.2	530	12250.00	1	0	0

Sample No.	Se*	Ga*	Ge*	In*	S%	V*	Cr*	Mn*	Fe%
JS-W2121	8.00	10.30	0.09	0.03	1.76	27	7	194	1.10
JS-W2122	5.00	16.60	0.09	0.04	.93	20	10	279	1.19

Sample No.	Th*	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*
JS-W2121	10.25	3.00	2	152.5	77.4	5.0	129	5.70	0.26
JS-W2122	14.00	2.30	1	232.0	146.0	5.5	150	6.40	0.28

Sample No.	Cs*	La*	Ce*	Li*	Be*	Na*	Mg*	Al*	P*
JS-W2121	0.69	18.40	35.40	16	1	9800	1100	33000	130
JS-W2122	1.02	24.80	44.90	20	2	17800	1400	53900	190

Sample No.	K *	Ca*	Sc*	Ti*	Te*	Hf*	Re*	Tl*
JS-W2121	22700	3000	1.50	860	0.95	4.20	1	1
JS-W2122	35400	6300	1.70	1070	0.54	4.70	0	2