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THE ORE DATABASE
Occurence 3332 - 011 Grågalten
(Object Id: 5946)
(Last updated: 22.03.2024)
Drill Cores: Grågalten
Location
County: Buskerud Municipality: Sigdal (3332)
Map 1:50000: Krøderen (1715-2) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 533757 m. North: 6653615 m.
Longitude: 9.6055640 Latitude: 60.0184070
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Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu Co
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: 7 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Co 0.06 % 22.03.2024
Cu 0.6 % 22.03.2024
Ni 0.7 % 22.03.2024

Operations
From - To Activity Comments
1874 - 1877 Regular production
1916 - 1916 Inspection Lensing av gruva
1918 - 1918 Sampling Prøver viste 0.70-0.75 % Ni, 0.55-0.60 % Cu
1940 - 1942 Inspection Company/Institution :Olaf K. Dokken
inndrivelse av grunnstoll
1942 - 1942 Geophysics Company/Institution :Magnetometri
1969 - 1969 Geology Company/Institution :T.N. Sund
Diplomoppgave, kartlegging, geofysikk og geokjemi
2005 - 2005 Geophysics Company/Institution :NGU, FUGRO
EM, magnetometri
2006 - 2006 Core drilling Company/Institution :Blackstone, Sulfidmalm AS
To borhull

Mineralization
Era: Proterozoic Period: Mesoproterozoic
Genesis: Orthomagmatic formation Form: Irregular
Main texture: Vein network Min. distribution: Massive (>50 % ore minerals)
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: Kongsberg Complex
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Hornblende Major mineral (>10%)
Gangue mineral Plagioclase Major mineral (>10%)
Gangue mineral Epidote Subordinate mineral (1-10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Gangue mineral Biotite Accessory mineral (<1%)
Gangue mineral Apatite Accessory mineral (<1%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Major mineral (>10%)
Ore mineral Pentlandite Subordinate mineral (1-10%)
Ore mineral Pyrite Accessory mineral (<1%)
Ore mineral Ilmenite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Metagabbro Intrusive
Original rock :Gabbro
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Rock contact Strike/Dip :40 / 70 Syn-mineralisation ;...Effect :Controls

Information(s) in free text format
Free text
The Grågalten mine consists of a ca. 20 m long and up to 7-8 m wide open pit and a connecting shaft to the north of the pit. Both are filled with water to a depth of ca. 15 m below the surface. The pit is estimated to be about 28 m deep. The ore zone was worked for up to 68 m in length in the upper part. An adit 76 m long from the south-east leads into the mine. This adit was finished during investigations in 1941. About 60 m to the north of the main workings is another shaft, but this is only 6 m deep. There are two very small prospects 60 m NW and 80 m SW of the main workings. The mineralisation is located at the contact between a large gabbroic (noritic) body and banded, felsic gneisses. The contact is exposed in the inner part of the adit leading into the main open pit.

Photo(s) from the Deposit area:
Photo no. 1 showing Grågalten, malmhaug"
Photo no. 2 showing Grågalten, dagstrossa"
Photo no. 3 showing Grågalten, i dagstrossa"
Photo no. 4 showing Grågalten, malmstuff"

Bibliography:
From NGU's Reference Archive:
Sund, Nikolai T. , 1969
En malmgeologisk undersøkelse i Sigdal-området.
;NTH Bergavd. / Norsk Hydro / NGU;AVHANDLING;NH-arkivet; No.NH 53;128 s. pages
Abstract:
Ramstad og Grågalten gruver

Poulsen, A.O. , 1942
Nikkelforekomster i Sigdal.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 64;7 pages
Abstract:
Rapporten beskriver to forekomster kort geologisk og konkluderer med at det bør utføres magnetometriske målinger og geologisk kartlegging for å kunne bedømme eventuelle malmkvanta. Forts. Lok.nr. 10271

Dokken, O. K. , 1941
Sigdal Nikkelverk.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 669;3 pages
Abstract:
Rapporten inneholder kort historikk om driften av verket fra 1874 til ca 1879-80. Korte kommentarer til Grågalten og Ramstad gruver om anbefaling av magnetiske målinger sammen med boringer.

Rosenlund, A. L. , 1918
Graagalten grube, Sigdal.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 4044;3 pages
Abstract:
Rapporten inneholder analyseresultater av 23 prøver med rusultat av 1,47 % nikkel i gjennomsnitt med kobberkis fratrukket. Med bakgrunn av de lave gehalter må gruven sies å være ikke drivverdig.

Merckoll, H. , 1940
Sigdal nikkelverks gruber.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1441;3 pages
Abstract:
Rapporten er en innberetning fra gruvene om dens drift og opptreden, og det konkluderes med at nærmere undersøkelser er nødvendig om ny drift kan startes.

Fieldsamples
Sample No. Sample type Miscellanrous
K17-11 Dump
Sampler: T. Bjerkgård
Comment: Massive po-cpy-ptl ore
No. of registrated element analyses = 1
K17-12 Dump
Sampler: T. Bjerkgård
Comment: Massive po-cpy-ptl ore
No. of registrated element analyses = 1
K17-6 Bedrock
Sampler: T. Bjerkgård
Comment: Semimassive po-cpy-ptl ore in amphibole matrix
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Grunnstoll
(Object Id: 36711 11,01,00)
Location
County: Buskerud Municipality: Sigdal (3332)
Map 1:50000: Krøderen (1715-2) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 533812 m. North: 6653558 m.
Longitude: 9.6065430 Latitude: 60.0178850
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Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu
Resources and production
Activity: Mining Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
The adit is 76 m in length, leading into the main pit from SE. It has been worked through mainly quartz-rich gneisses with a few thin zones of micaceous schist. About 4 m to the south of the pit hornblende-bearing altered gabbro is exposed. Thus the ore zone is located close to, and partly at the contact between the gabbro and gneiss.

Name of Locality: Synk
(Object Id: 36712 11,02,00)
Location
County: Buskerud Municipality: Sigdal (3332)
Map 1:50000: Krøderen (1715-2) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 533765 m. North: 6653631 m.
Longitude: 9.6057120 Latitude: 60.0185530
Show on map
Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu
Resources and production
Activity: Mining Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Deep shaft 5x5 m in outline, connected to the main pit at depth.

Name of Locality: Synk
(Object Id: 36713 11,03,00)
Location
County: Buskerud Municipality: Sigdal (3332)
Map 1:50000: Krøderen (1715-2) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 533789 m. North: 6653692 m.
Longitude: 9.6061350 Latitude: 60.0190900
Show on map
Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu
Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production:


Information(s) in free text format
Free text
A shaft 7x7 m in outline, fileld with water. Accoring to reports it is 6 m deep. Probably it has been worked along the same ore zone as the main pit. The wallrock exposed is gabbroic. Cobbles at the dump consist of very rich disseminations of chalcopyrite and pyrrhotite in a matrix rich in amphibole (sample K17-7).

Fieldsamples
Sample No. Sample type Miscellanrous
K17-7 Dump
Sampler: T. Bjerkgård
Comment: Rich po-cpy-ptl impregnation in amphbole-dominated matrix
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Grop
(Object Id: 36714 11,04,00)
Location
County: Buskerud Municipality: Sigdal (3332)
Map 1:50000: Krøderen (1715-2) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 533709 m. North: 6653664 m.
Longitude: 9.6047130 Latitude: 60.0188450
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Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
This small and shallow pit must be on a parallel ore zone to the main zone. The ore is very irregular and variable, consisting of pyrrhotite and chalcopyrite in quartz-amphibole matrix, generally banded and foliated (sample K17-8).

Fieldsamples
Sample No. Sample type Miscellanrous
K17-8 Dump
Sampler: T. Bjerkgård
Comment: Semimassive po-cpy-ptl ore in amphibole-dominated matrix
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Grøft
(Object Id: 36715 11,05,00)
Location
County: Buskerud Municipality: Sigdal (3332)
Map 1:50000: Krøderen (1715-2) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 533725 m. North: 6653544 m.
Longitude: 9.6049630 Latitude: 60.0177750
Show on map
Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu


Information(s) in free text format
Free text
A 3.5 m long, 1-1.5 m wide and up to 2 m deep trench located 80 SW of the main pit. Mineralization of irregular, partly rich dissemination of chalcopyrite and pyrrhotite in gabbroic matrix (sample K17-9).

Fieldsamples
Sample No. Sample type Miscellanrous
K17-9 Dump
Sampler: T. Bjerkgård
Comment: Rich po-cpy-ptl impregnation in gabbroic matrix
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 3332 - 011 Grågalten

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#
K17-11 Dump 2410 93 13 736 7300 1.4 37.0
K17-12 Dump 4160 216 17 406 3830 2.2 50.0
K17-6 Bedrock 3920 244 22 509 4930 1.9 30.0
K17-7 Dump 17200 195 9 359 4770 6.8 43.0
K17-8 Dump 6700 82 9 629 7250 2.4 3.0
K17-9 Dump 20500 237 8 411 4200 7.5 31.0
------------------
Sample No. Pt# Pd# As* Fe% P* Ti*
K17-11 -5.0 110.0 2 36.80 300 2740
K17-12 7.0 14.0 -1 25.30 440 3150
K17-6 -5.0 22.0 1 29.00 370 2910
K17-7 -5.0 36.0 -1 19.90 480 4830
K17-8 45.0 58.0 -1 30.00 150 1840
K17-9 -5.0 54.0 -1 25.10 150 2280

The fact sheet was created on 19.04.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
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