Fact Sheet for Deposit Area 1238

					Norsk versjon
	THE ORE DATABASE
	Deposit Area 1238 - 008
	(Last updated 13.mar.2024)

Name of Deposit Area : Gravdal

(Object Id : 1238,008,00,00)

Location

County :

Hordaland (12)

Municipality :

Kvam (1238)

Map 1:50000:

Varaldsøy (1215-2)

Map 1:250000:

Bergen

Marking point:

Longitude:

5.8956080

Latitude:

60.1163290

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

327494 m.

Y-coord:

6668420 m.

Commodity

	Main Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Sub Type:	Copper
			Element(s):	Kis Cu

Production

Activity:	Mining	Reserves:
Prod. method:	Underground mining	Production:	141 thousand tons
Prod. status:	Disused, closed	Volume of dump:

Importance

Public: Not Assessed (reg. 18.02.2015)

Economical: Not classified/evaluated

Products

Element/product Crude ore grade or quality

CU 1,35 %

S 40 %

ZN 0,7 %

Operations

From - To Activity Comments

1864 - 1873 Regular production Manchester company

1915 - 1919 Test mining Company/Institution :Hardanger Copper Mines Ltd.

1943 - 1944 Test mining Company/Institution :A/S Mineral, Gravdal Gruber

1953 - 1963 Regular production Company/Institution :A/S Stordø Kisgruber

Mineralization

Era: Paleozoic Period: Ordovician

Dating: Method:

Genesis: Volcex Form: Layer

Main texture: Massive Min. distribution: Massive (>50 % ore minerals)

Main grain size: Fine grained (< 1 mm) Main alteration: Chloritisation

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Hardangerfjord Nappe Complex

Tectonic complex: Varaldsøy Complex

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Ore mineral Pyrite Major mineral (>10%)

Ore mineral Chalcopyrite Subordinate mineral (1-10%)

Ore mineral Sphalerite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Host rock Greenstone Extrusive
Original rock :Basalt

Metamorphic facies :Greenschist

Structures

Location: Type: Orientation(360 gr.): Relation to min.:

Host rock Fold axis Dir./Plunge :225 / 15 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Gravdal VMS deposit is located along the contacts between metabasalt and minor bodies of feldspar porphyric rhyodacite, at the same stratigraphic level as Valaheien deposit on Varaldsøy in the Ølve-Varaldsøy Group. The ore body has a thickness 0.5 to 2.5 m and is a fine grained pyritic banded ore with minor amounts of chalcopyrite. The mine was connected to a harbour by the fiord by a 0.8 km long tunnel. The ore body outcrops at 170 m.a.s.l. and the tunnel is located at 50 m.a.s.l. by the mine.

Photo(s) from the Deposit area:

Photo no. 1 showing Gammelgruva, gruveåpning"

Photo no. 2 showing Gammelgruva, kismalm"

Bibliography:

From NGU's Reference Archive:

Bluett-Newton, A.; Torkelsen, I. , 1914

Report on the Gravdal Copper pyrites mines.

;Norges geologiske undersøkelse;TEKNISK RAPPORT;Bergarkivet; No.BA 1452;8 pages

Abstract:

Rapporten beskriver gruvetekniske forhold.

Borchgrevink, H. K. , 1924

Gravdal kobbergrube.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3407;5 pages

Abstract:

Malmen omtales som lag av kompakt svovelkismalm og impregnasjoner i klorittskifer. Kopperinnholdet er lavt og mektigheten er under 1,5m.

Foslie, S. , 1916

Report on the Gravdal sulphur-and copper mines, Hardanger, Norway.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1764;16 pages

Abstract:

Rapporten beskriver geologi, malmgehalter og malmproduksjon. Mineraliseringene består av kobberkisholdig svovelkis som bånd og impregnasjoner i kaledonsk kvarts-kloritt skifer.

Myhra, R. , 1961

Gravdal (Bergedal) Grube.

;Norges geologiske undersøkelse;TEKNISK RAPPORT;Bergarkivet; No.BA 3406;2 pages

Abstract:

Rapporten gir opplysninger om driftsperioder og malmproduksjon.

Hill, A.; Stewart , 1920

Gravdal grube. Plankart og gruveprofil 1:250, 1:1 000

;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 409

Fieldsamples

Sample No. Sample type Miscellanrous

GRAVDAL-01 Dump

Sampler :T. Bjerkgård

Comment :Diffust båndet svært finkornet massiv pyritt med anrikning av kobberkis og sinkblende i noen mm-tykke bånd.

No. of registrated element analyses = 1

GRAVDAL-02 Bedrock

Sampler :T. Bjerkgård

Comment :Massiv, finkornet (<0.5 mm) pyritt, svært diffust båndet, aksessorisk kobberkis i noen bånd. Fastfjell fra nordveggen i skjæring utenfor Gamlegruva

No. of registrated element analyses = 1

GRAVDAL-03 Bedrock

Sampler :T. Bjerkgård

Comment :1-2 dm sone med massiv pyritt-kobberkis malm, kobberkis i slirer og linser. Fastfjell i sørveggen i skjæring ved Gamlegruva.

No. of registrated element analyses = 1

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

Name of Locality : Undersøkelsesstoll

(Object Id : 1238,008,01,00)

Location

County : Hordaland (12) Municipality : Kvam (1238)

Map 1:50000: Varaldsøy (1215-2) Map 1:250000: Bergen

Marking point: Longitude: 5.8994770 Latitude: 60.1178840

EU89-UTM Zone 32 (Coordinates IS confirmed)

X-coord: 327717 m. Y-coord: 6668582 m.

Commodity

Main Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Sub Type: Copper

Element(s): Kis Cu

Production

Activity: Exploration Reserves:

Prod. method: Production:

Prod. status: Volume of dump:

Information(s) in free text format

Free text

Undersøkelsesstoll ca. 40 m lang på tvers av strøket. Går sørøstover fra gruveveien. Lengst inne ca. 20-30 cm sone med kvarts-kloritt-(sericitt) med spredt pyritt. Sannsynligvis fortsettelsen av malmsonen.

Analyse Results

from

Deposit Area 1238 - 008 Gravdal

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#

GRAVDAL-01 Dump 30700 28000 496 195 23 13.2 243.0

GRAVDAL-02 Bedrock 1640 1930 130 292 250 18.4 310.0

GRAVDAL-03 Bedrock 66200 5320 350 348 11 37.9 514.0

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

Sample No. As* Cd* Ba* Mo* Sn* Sb* Bi* Se* Ga*

GRAVDAL-01 276 70.5 -10 21.50 6 3 43 48.00 15.65

GRAVDAL-02 60 13.2 -10 38.40 2 1 12 60.00 0.92

GRAVDAL-03 86 36.6 -10 14.20 3 1 208 106.00 0.71

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

Sample No. Ge* In* S% V* Cr* Mn* Fe% Th* U*

GRAVDAL-01 0.31 8.72 9.99 74 8 132 40.40 0.03 0.30

GRAVDAL-02 0.40 1.43 9.99 8 5 75 36.40 0.01 0.40

GRAVDAL-03 0.59 3.82 9.99 2 7 58 27.90 0.02 0.50

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

Sample No. W* Rb* Sr* Y* Zr* Nb* Ta* Cs* La*

GRAVDAL-01 1 0.4 0.7 0.5 1 0.10 -0.05 -0.05 -0.50

GRAVDAL-02 -0 0.1 10.0 0.5 -1 -0.10 -0.05 -0.05 -0.50

GRAVDAL-03 0 0.1 2.3 0.6 1 0.10 -0.05 -0.05 -0.50

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

Sample No. Ce* Li* Be* P* Sc* Ti* Te* Hf* Re*

GRAVDAL-01 0.26 -0 -0 -10 0.70 50 72.00 -0.10 0

GRAVDAL-02 0.16 -0 -0 10 0.30 -50 21.10 -0.10 0

GRAVDAL-03 0.54 -0 -0 -10 0.50 -50 223.00 -0.10 0

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

Sample No. Tl*

GRAVDAL-01 1

GRAVDAL-02 1

GRAVDAL-03 0

	Element/product	Crude ore grade or quality
	CU	1,35 %
	S	40 %
	ZN	0,7 %

From - To	Activity	Comments
1864 - 1873	Regular production	Manchester company
1915 - 1919	Test mining	Company/Institution :Hardanger Copper Mines Ltd.
1943 - 1944	Test mining	Company/Institution :A/S Mineral, Gravdal Gruber
1953 - 1963	Regular production	Company/Institution :A/S Stordø Kisgruber

Era:	Paleozoic	Period:	Ordovician
Dating:		Method:
Genesis:	Volcex	Form:	Layer
Main texture:	Massive	Min. distribution:	Massive (>50 % ore minerals)

	Province:	Caledonides
	Geotec.unit:	Hardangerfjord Nappe Complex
	Tectonic complex:	Varaldsøy Complex
	Igneous complex:

Relationship	Mineral	Amount
Ore mineral	Pyrite	Major mineral (>10%)
Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
Ore mineral	Sphalerite	Accessory mineral (<1%)

Relationship	Rock	Origin
Host rock	Greenstone	Extrusive Original rock :Basalt
		Metamorphic facies :Greenschist

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fold axis	Dir./Plunge :225 / 15	Post-mineralisation ;...Effect :Modifies

	Abstract:
	Malmen omtales som lag av kompakt svovelkismalm og impregnasjoner i klorittskifer. Kopperinnholdet er lavt og mektigheten er under 1,5m.

	Abstract:
	Rapporten beskriver geologi, malmgehalter og malmproduksjon. Mineraliseringene består av kobberkisholdig svovelkis som bånd og impregnasjoner i kaledonsk kvarts-kloritt skifer.

	Abstract:
	Rapporten gir opplysninger om driftsperioder og malmproduksjon.

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

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
GRAVDAL-01	Dump	30700	28000	496	195	23	13.2	243.0
GRAVDAL-02	Bedrock	1640	1930	130	292	250	18.4	310.0
GRAVDAL-03	Bedrock	66200	5320	350	348	11	37.9	514.0

Sample No.	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*	Se*	Ga*
GRAVDAL-01	276	70.5	-10	21.50	6	3	43	48.00	15.65
GRAVDAL-02	60	13.2	-10	38.40	2	1	12	60.00	0.92
GRAVDAL-03	86	36.6	-10	14.20	3	1	208	106.00	0.71

Sample No.	Ge*	In*	S%	V*	Cr*	Mn*	Fe%	Th*	U*
GRAVDAL-01	0.31	8.72	9.99	74	8	132	40.40	0.03	0.30
GRAVDAL-02	0.40	1.43	9.99	8	5	75	36.40	0.01	0.40
GRAVDAL-03	0.59	3.82	9.99	2	7	58	27.90	0.02	0.50

Sample No.	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*	Cs*	La*
GRAVDAL-01	1	0.4	0.7	0.5	1	0.10	-0.05	-0.05	-0.50
GRAVDAL-02	-0	0.1	10.0	0.5	-1	-0.10	-0.05	-0.05	-0.50
GRAVDAL-03	0	0.1	2.3	0.6	1	0.10	-0.05	-0.05	-0.50

Sample No.	Ce*	Li*	Be*	P*	Sc*	Ti*	Te*	Hf*	Re*
GRAVDAL-01	0.26	-0	-0	-10	0.70	50	72.00	-0.10	0
GRAVDAL-02	0.16	-0	-0	10	0.30	-50	21.10	-0.10	0
GRAVDAL-03	0.54	-0	-0	-10	0.50	-50	223.00	-0.10	0