Norsk versjon
	THE ORE DATABASE
	Deposit Area 621 - 011
	(Last updated 22.mar.2024)

Importance

Public:

Little Importance (reg. 18.02.2015)

Economical:

Minor interest , (Confirmed 16.feb.2005 by Havard Gautneb)

Products

	Element/product	Crude ore grade or quality
	CO	0.06 %
	CU	0.6 %
	NI	0.7 %

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
	Dating:		Method:
	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 : 0621,011,01,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6065430

Latitude:

60.0178850

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

533812 m.

Y-coord:

6653558 m.

Commodity

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

Production

	Activity:	Mining	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:

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 : 0621,011,02,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6057120

Latitude:

60.0185530

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

533765 m.

Y-coord:

6653631 m.

Commodity

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

Production

	Activity:	Mining	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:

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 : 0621,011,03,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6061350

Latitude:

60.0190900

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

533789 m.

Y-coord:

6653692 m.

Commodity

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

Production

	Activity:	Mining	Reserves:
	Prod. method:	Underground mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	125 m3

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 : 0621,011,04,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6047130

Latitude:

60.0188450

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

533709 m.

Y-coord:

6653664 m.

Commodity

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

Production

	Activity:	Pitting	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:

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 : 0621,011,05,00)

---

Location

County :

Buskerud (06)

Municipality :

Sigdal (0621)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Marking point:

Longitude:

9.6049630

Latitude:

60.0177750

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

533725 m.

Y-coord:

6653544 m.

Commodity

	Main Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Sub Type:	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 621 - 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

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The fact sheet was created on 20.01.2025

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

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