Norsk versjon
THE INDUSTRIAL MINERAL DATABASE
Occurence 1836 - 305 Nord-Værnes
(Object Id: 7457)
(Last updated: 17.03.2015)

Location
County: Nordland Municipality: Rødøy (1836)
Map 1:50000: Melfjorden (1928-3) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 422568 m. North: 7395356 m.
Longitude: 13.2478780 Latitude: 66.6670900
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Resource
Resource Type: Graphite Resource Subtype: Graphite

Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Mining Reserves:
Operating method: Open pit and underground mining Historical production: 0 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Refractories 20 % 20.08.1993

Operations
From - To Activity Comments
1940 - 1945 Regular production Company/Institution :Tysk okkupasjon

Mineralization
Era: Proterozoic Period:
Genesis: Sedimentary deposit Form: Layer
Main texture: Banded Min. distribution: Disseminated (<20 % ore minerals)
Main grain size: Medium grained (1-3 mm)
Strike/Dip: 274 / 78 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Mineral Amount
Graphite Major mineral (>10%)
Plagioclase Major mineral (>10%)
Quartz Major mineral (>10%)
Biotite Subordinate mineral (1-10%)

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Foliation Strike/Dip :274 / 78 Post-mineralisation ;...Effect :Controls

Information(s) in free text format
Free text
The deposit is situated about 100 meter from the road, at Nord-Værnes. A 50 meter long trench is what is visible from the former mining period (about 1920). The graphite bearing rock is part of an unit of supracrustal rocks that occur as large lenses and layers a long the whole of the Nord-Værnes peninsula. Airborne geophysics show the extent of these supracustals. Graphite bearng rocks can be found and several localities also on the western end of the peninsula. The graphite ore is coarse crystalline and flaky, grades vary from 4 to about 16% of graphitic carbon.

Bibliography:
From NGU's Reference Archive:
Korneliussen, Are , 1976
Malmgeologisk undersøkelse med henblikk på økonomisk utnyttelse av kromittforekomstene på kartbladene Rødøy og Lurøy.
;NTH Bergavd.;AVHANDLING

Bakke, Stig; Korneliussen, Are , 1986
Jack-straw-textured olivines in some Norwegian metaperidotites.
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.66 (4);271-276 pages
Abstract:
Jack-straw-textured olivines, which are elongate olivines of metamorphic origin, occur in complexly metamorphosed ultramafites within the Norwegian Caledonides. The ultramafic bodies are lenses enclosed within high-grade mica-shists or gneisses. In generally they consist of a dunitic core sur- rounded by massive olivine orthopyroxenite with a mantle of jack-straw-textured olivines in contact with the country rocks. The jack-straw olivines are elongate, radomly orientated platy crystals from 3 cm to 1 m long. They lie in a matrix of orthopyroxene, carbonate and minor tremolite. Field relations between various rock-types, including jack-straw textured olivine + carbonate + talc +/ bronzite veins, are well exposed at the Nordvernes ultramafic body, North Helgeland.

Rodionov, Alexei; Ofstad, Frode; Tassis, Georgios , 2013
Helicopter-borne magnetic, electromagnetic and radiometric geophysical survey in Holandsfjorden area, Meløy, Nordland
;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2013.043;26 pages
Abstract:
NGU conducted an airborne geophysical survey in Holandsfjorden area in July 2013 as part of the MINN project. This report describes and documents the acquisition, processing and visualization of recorded datasets. The geophysical survey results reported herein are 1006 line km, covering an area of 200 km2.

Rønning, Jan S.; Gautneb, Håvard; Dalsegg, Einar; Larsen, Bjørn E.; Rodionov, Alexei , 2015
Oppfølgende grafittundersøkelser i Meløy og Rødøy kommuner, Nordland
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.2014.046;63 pages
Abstract:
Som et ledd i Regjeringens satsning mot mineraler i Nord-Norge (MINN), utførte NGU geofysiske målinger fra helikopter rundt Holandsfjorden i 2013. Helikoptermålingene viste interessante ElektroMagnetiske (EM) anomalier som etter NGUs oppfatning burde undersøkes nærmere. I et samarbeid med Nordland fylkeskommune, Meløy Næringsutvikling og Rødøy kommuner har NGU evaluert grafittpotensialet i området gjennom tolkning av geofysiske data målt fra helikopter og på bakken samt oppfølgende geologisk kartlegging, prøvetaking og analyse. Det er ikke indikert god grafitt i større mengder utenom de to kjente forekomstene ved Nord-Værnes og Rendalsvik.

Fieldsamples
Sample No. Sample type Miscellanrous
HG52-14 Bedrock
Sampler: Havard Gautneb
Comment: Sample of graphit schist, UTMX: 422452 UTMY: 7395362
No. of registrated special analyses = 1
HG53-14 Bedrock
Sampler: Havard Gautneb
Comment: Sample of graphit schist, UTMX: 419930 UTMY: 7395061
No. of registrated special analyses = 1
hg57-14 Bedrock
Sampler: Havard Gautneb
No. of registrated special analyses = 1
hg59-14 Bedrock
Sampler: Havard Gautneb
No. of registrated special analyses = 1
Hg60-14 Bedrock
Sampler: Havard Gautneb
No. of registrated special analyses = 1
Hg61-14 Bedrock
Sampler: Havard Gautneb
No. of registrated special analyses = 1
hg62-14 Bedrock
Sampler: Havard Gautneb
No. of registrated special analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Sample point
(Object Id: 23151 305,00,01)

Location
County: Nordland Municipality: Rødøy (1836)
Map 1:50000: Melfjorden (1928-3) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 422549 m. North: 7395345 m.
Longitude: 13.2474520 Latitude: 66.6669930
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Resource
Resource Type: Graphite Resource Subtype: Graphite


Fieldsamples
Sample No. Sample type Miscellanrous
HG27-12 Bedrock
Sampler: Håvard Gautneb
Comment: Dissiminated graphite schist. Carbon content = 19.64%
No. of registrated special analyses = 1
HG28-12 Bedrock
Sampler: Håvard Gautneb
Comment: Dissiminated graphite schist. Carbon content = 16.98%
No. of registrated special analyses = 1
JW12-9 Bedrock
Sampler: Jan Egil Wanvik
Comment: Dissiminated graphite schist. Carbon content = 13.2%
No. of registrated special analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 1836 - 305 Nord-Værnes

Special analyses
Sample No. Sample Type What is measured Result
HG27-12 Bedrock Total carbon (TC) 19,6%
HG28-12 Bedrock Total carbon (TC) 17%
HG52-14 Bedrock Total carbon (TC) 16.5%
HG53-14 Bedrock Total carbon (TC) 4.67%
hg57-14 Bedrock Total carbon (TC) 3.48%
hg59-14 Bedrock Total carbon (TC) .54%
Hg60-14 Bedrock Total carbon (TC) 1.74%
Hg61-14 Bedrock Total carbon (TC) 2.26%
hg62-14 Bedrock Total carbon (TC) 4.9%
JW12-9 Bedrock Total carbon (TC) 13,2%


The fact sheet was created on 28.03.2024

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