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	THE ORE DATABASE
	Deposit Area 1832 - 020
	(Last updated 08.des.2025)

Importance

Public:

(No data)

Economical:

Not classified/evaluated

Operations

	From - To	Activity	Comments
	1993 - 1994	Geochemistry	Company/Institution :NGU
	1996 - 1996	Sampling	Company/Institution :NGU
	1996 - 1996	Detail mapping	Company/Institution :NGU

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:		Method:
	Genesis:	Unknown	Form:	Irregular
	Main texture:		Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Coarse grained (> 3 mm)

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

	Province:	Caledonides
	Geotec.unit:	Rødingsfjell Nappe Complex
	Tectonic complex:
	Igneous complex:

Group:

Kongsfjell

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Biotite	Major mineral (>10%)
	Gangue mineral	Garnet	Major mineral (>10%)
	Gangue mineral	Amphibole	Major mineral (>10%)
	Gangue mineral	Quartz	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Sphalerite	Subordinate mineral (1-10%)
	Ore mineral	Galena	Accessory mineral (<1%)
	Ore mineral	Molybdenite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Garnet-mica schist	Sedimentary Original rock :Argillaceous sediment
			Metamorphic facies :Amphibolite

Information(s) in free text format

Free text

Basert på regionale jordprøvetaking i 1993 og 1994 ble det funnet sulfidmineralsering i fast fjell like sør for bredden av Grasvatnet nord for utløpet av Oksfjellelva. Mineraliseringene består av svak impregnasjon av kobberkis, sinkblende og blyglans i granat-kvarts-amfibol-biotittbergart. Bergarten er lokalt skifrig, men vanligst er den massiv med uorienterte nåler av fargeløs amfibol med interstitielle sulfider og andre silikater. Ofte er den rusten og har et gossan-preg. Det er også et tynt lag med kyanitt-granat-turmalin assosiert. Mineralisert gossan opptrer i tynne linser (2-10 m) med en begrenset utstrekning, typisk 10-50 m. Sannsynligvis har det vært et kontinuerlig lag som er avrevet som følge av deformasjon. Sonen er totalt 5-600 m lang og kiler ut mot sør mot Oksfjellelva. Kobberkis dominerer og er typisk assosiert med magnetkis, ofte i lamellær epitaksial vekst. Sinkblende opptrer underordnet, mens blyglans opptrer kun lokalt. Forholdsvis grovkornet molybdenglans opptrer spredt.

Bibliography:

From NGU's Reference Archive:

Krog, Reidar , 1996

	Soil geochemistry of the Bleikvassli area (Status Report No.1) Regional investigations of the area between Røssvatnet and Målvatnet

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.95.155;85 pages

Abstract:

A combined geological, geophysical and geochemical exploration aimed at finding new ore reserves in the vicinity of the Bleikvassli mine, Nordland county was initiated by NGU in 1993. This report describes a regional soil (c-horizon/ weathered material) geochemical survey carried out as a part of this project. An area of 800 sq.km was sampled at a density of 1 sample per square kilometer. The samples were analysed for the HNO3-extractable amouths of Ba,Be,Ca,Ce,Cd,Co,Cr,Cu,Fe,K,La,Li,Mg,Mn,Mo,Ni,P,Pb,S,Sc,Sr,Ti,V,Zn,Zr,Y, the total amounts of C (Leco), S(Leco), Au (fire assay) and the grain size (sieving). The single-element symbol maps showed several anomalous areas and detailed sampling of the three most interesting areas was carried out in 1994-1995. These investigations are described in NGU Report 95.156, but the results are also considered in this report and evaluated together with the other anomalous areas within the Bleikvassli area. The need for further investigations is discussed.

Krog, Reidar , 1996

	Soil geochemistry of the Bleikvassli area (Status Report No.2) Detailed investigations of the Hallvarddalen, Artfjellet and Kjennsvatnet areas

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.95.156;104 pages

Krog, Reidar , 1997

	Soil geochemistry of the Bleikvassli area ( Status Report No.3). Detailed investigation of the Grasvatnet area.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.97.106;44 pages

Abstract:

A combined geological, geophysical and geochemical exploration project aimed at finding new ore reserves in the vicinity of the Bleikvassli mine, Nordland county was initiated by NGU in 1993. A number of the anomalous areas detected during this regional survey were followed up with more detailed investigations. One of these was the Grasvatnet area where detailed geological mapping revealed sulphide-impregnations with restricted thickness and extent. Deep geophysical anomalies (Transient Field EM) are connected with these minerali- sations and this report deals with the results of detailed soil sampling around the mineralisations and geophysical anomalies.

Bjerkgård, Terje; Larsen, Rune B. , 1996

	Follow-up studies in the Okstindan Area, The Rødingsfjall Nappe Complex, Nordland, Norway

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.96.157;34 pages

Abstract:

Follow-up work has been conducted in three restricted areas of the 1200 km2 large Okstindan Area on the basis of earlier anomalies found during regional surveys. The three areas have been subjected to detailed geophysical mapping, mineralogical studies and sampling for whole-rock geochemistry. Mineralizations in the area consist of non-economic sulfide-impregnations with restricted thickness and extent. Skarn-type mineralizations consisting of mainly clinoamphibole, garnet, quartz and biotite, found in the Brunesbekken and Grasvatnet areas, have not previously been reported from the Okstindan Area. Similar types of mineralizations are, however, typical for the Plurdalen Group in the Mofjellet Area. The mineralization in Rabotsbekken is hosted by quartzite and quartzitic schists and can be classified as a low-grade sulfide mineralization or a high-grade exhalite. Deep geophysical anomalies (Transient Field EM) are connected to the mineralizations in both Brunesbekken and Rabotsbekken. However, graphitic schists are associated with the mineralizations and the cause of the anomalies may be graphite or massive sulfides.

Bjerkgård, Terje , 1998

	The Bleikvassli Project, field report 1997

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.98.074;28 pages

Abstract:

This report presents preliminary results of detailed geological follow-up studies and diamond drilling carried out in the Okstindan Area, Nordland, Norway in the period July to August 1997. Preliminary results from drilling done in November and December 1997 is included in this report. Field work to the south and at the base of the Okstindan massif along the Kongsfjell / Anders Larsa contact revealed no signs of mineralization. Extensive mineralized zones at Gjetarfjellet to the east of Røssvatnet have been mapped out. Because of weathering, the nature of the mineralizations is not known and further work to expose fresh surfaces is highly recommended. A Cu-Ni mineralization related to ultramafic rocks was found at the border to Sweden. The extent of this mineralization is too small to be economic, judged from the surface exposure. However, geophysics indicate a larger extent at depth and also other anomalies in the area. More field work and ground geophysics is recommended in the area.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	TB96-016	Bedrock	Sampler :T. Bjerkgård No. of registrated element analyses = 1
	TB96-017A	Bedrock	Sampler :T. Bjerkgård No. of registrated element analyses = 1
	TB96-017B	Bedrock	Sampler :T. Bjerkgård No. of registrated element analyses = 1
	TB96-018	Bedrock	Sampler :T. Bjerkgård No. of registrated element analyses = 1
	TB96-019	Bedrock	Sampler :T. Bjerkgård No. of registrated element analyses = 1
	TB96-020	Bedrock	Sampler :T. Bjerkgård No. of registrated element analyses = 1
	TB96-021	Bedrock	Sampler :T. Bjerkgård No. of registrated element analyses = 1

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

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Analyse Results

from

Deposit Area 1832 - 020 Grasvatnet

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#
TB96-016	Bedrock	5201	194	24	16	19	3.4	50.0
TB96-017A	Bedrock	38231	2743	581	12	12	12.0	140.0
TB96-017B	Bedrock	12865	1717	1558	6	10	9.5	256.0
TB96-018	Bedrock	54898	348	17	8	15	24.9	127.0
TB96-019	Bedrock	12966	1345	73	12	13	6.6	188.0
TB96-020	Bedrock	15820	5867	5520	6	10	86.0	641.0
TB96-021	Bedrock	13808	29233	6103	28	18	15.3	207.0

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Sample No.	As*	Cd*	Ba*	Mo*	Sb*	Bi*
TB96-016	-10	.5	114	-2.00	-5	29
TB96-017A	-10	8.3	36	163.00	-5	44
TB96-017B	25	3.5	89	197.00	-5	36
TB96-018	-10	5.8	41	-2.00	9	46
TB96-019	-10	4.0	9	17.00	-5	8
TB96-020	125	13.0	46	239.00	-5	71
TB96-021	96	40.5	148	105.00	-5	44

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The fact sheet was created on 09.12.2025

Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no

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