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	THE ORE DATABASE
	Occurence 5603 - 025 Porsa grube
	(Object Id: 788) (Last updated: 11.10.2017)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Cu	2 %	05.12.1996

Operations

	From - To	Activity	Comments
	1905 - 1918	Regular production

Mineralization

	Era:	Proterozoic	Period:	Paleoproterozoic
	Genesis:	Hydrothermal vein	Form:	Plate
	Main texture:	Porphyroblastic	Min. distribution:	Irregular (scattered)

Main grain size:

Very unevenly grained

Main alteration:

No country rock alteration

	Strike/Dip:	280 / 85	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Paleoproterozoic

	Province:	Caledonian Basement Province
	Geotec.unit:	Komagfjord-Repparfjord Greenstone Belt
	Tectonic complex:
	Igneous complex:

Group:

Nussir

Formation:

Svartfjell

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Calcite	Major mineral (>10%)
	Gangue mineral	Plagioclase	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Gangue mineral	Hornblende	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Hematite	Subordinate mineral (1-10%)
	Ore mineral	Magnetite	Subordinate mineral (1-10%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Unknown	Grønnstein	Extrusive Original rock :Basalt
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Unknown	Joints/Fractures	Strike/Dip :280 / 85	Syn-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

The Porsa mine is located at Gruvevatn (Øvre Porsavatn), 4 km south-southeast of Porsa village in Kvalsund municipality. The mine is accessible by road with a gate. Key to the gate can be obtained from the neighbouring houses. The mine is situated close to the dam for the electrical power supply. The mining in the area started in 1900 by opening of the Bachke mine, nearly 3 km north of the Porsa mine. The company A/S Vesterdalen Kobbergruver (Copper Mines) commenced the investigations in Porsa in 1905. Porsa Copper Mines Ltd, under the leadership of Loius Greville and based on English investments, had then already conducted minor investigations in the area. The mining rights between the companies were not settled. A/S Vesterdalen was bankrupt by the end of 1905, and its properties was overtaken by the Swedish company Skandia. They conducted very limited investigations in the period 1906-07, and sold the rights to the English company Porsa Copper Mines Ltd. Test mining was carried out in Porsa in 1905 and the beginning of 1906. Ca. 600-700 tonnes of ore were sold to the Alten Kobberverk in Kåfjord and partly shipped to a smelter in Swansea in England. Porsa Copper Mines Ltd commenced further work in 1908 and the ore production was 3-4000 tonnes annually in the period 1909-1911. The reason for the closing of the mine in 1911 is not known. In 1918 the mine was reopened by A/S Porsa Kobbergruver, that carried out active mining until 1931. The mine was closed in due to lower copper prices. The mining has been carried out along two parallel, nearly east-west orientated carbonate+quartz veins in metabasalt. These veins are located about 150 m apart, and were named Greville in the south and Parallel (also Chr. Michelsen) in the north. The shafts are 76 m and 64 m, respectively. From an adit on the level ¿64 in the Parallel a shaft has been made down to 96 m below surface. Further mining has been carried out along adits and stopes on several levels. The entrances are today closed by concrete and steel covers and are not accessible. The ore-bearing veins are about 100 metres long. The thickness of the veins varies between 3 and 10 m and seems to decline along depth in the vertical veins. Steep dips, around 85° towards north are also found The deposit is located in Paleoproterozoic greenstones of the Svartfjell Formation in the Nussir Group, about 2 km northeast of the Caledonian Nappes. Well-preserved pillow lava structures occur in the greenstones in the area between the veins. The ore minerals consist of chalcopyrite and pyrite comprising aggregates and thin lenses and bands. Magnetite and hematite are also commonly found in the calcite dominated veins. Lensoide inclusions of the wall-rock commonly occur.

Bibliography:

From NGU's Reference Archive:

Bergen, A. M. , 1918

	Porsa grube, daganlegg ved hovedgruvene 1:500.

;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 989

Damm, C.O.B. , 1918

	A/S Porsa kobbergruber.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3824;8 pages

	Abstract:
	Rapporten beskriver 2 dagers befaring av gruvene Greville og Chr. Mickelsen etter at de er lenset for vann. Beskrivelse av bergarter og mineraler i alle gruveganger samt i malmgangene i dagen gis. Eventuell gjenopptagelse av driften er ikke diskutert.

Geis, H.P. , 1967

	Porsa Grube Kvalsund, Finnmark.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 6618;1 pages

	Abstract:
	Rapporten konkluderer med at man anser A/S Porsa konsesjonsområde ikke drivverdig, - og Elkem - Spigerverket lar konsesjonen tilfalle Staten. Kartbilagene viser geologisk kartlegging med prøvetakingsprofiler i det mineraliserte feltet. Forekomstnr. forts.: 50076-84 og 50397. Forekomstens koordinater forts.: 35 6131 78251.

Krause, Michael , 1980

	Some uranium mineralizations in the Raipas Suite of the Komagfjord tectonic window, Finnmark, Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.355;49-52 pages

	Abstract:
	Uranium mineralizations have been discovered in the northwest part of the Komagfjord tectonic window. The mineralizations are found in two mines of the old Porsa-Neverfjord copper mining district. Pitchblende and brannerite occur as primary minerals. Black slates are considered to be the source rocks of the uranium-bearing fluids.

Reitan, P. H. , 1958

	Forslag til videre undersøkelser i Porsa-området.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3941;3 pages

	Abstract:
	I rapporten foreslås geologisk kartlegging både i og utenfor de gamle gruvene i Porsa-området, med spesiell vekt på strukturer og sprekkesystemer. Dette anses nødvendig hvis det skal være mulig å finne mer malm i området. Rapporten skisserer bemannings- og utstyrsbehov for undersøkelsen.

Sandstad, Jan Sverre , 1981

	Porsa malmfelt.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1800/62A;20 pages

Abstract:

Rapporten er et sammendrag fra Michael Krauses rapporter og doktorgrad fra Mainz 1981: "Eine Schwermetallprospektion im alten Porsa Neverfjord-Grubenzirk von Nord-Norwegen". Krause har nylig påvist svake uran-mineraliseringer i forbindelse med kjente gangforekomster av kobbersulfider i Porsafeltet. Med bakgrunn i disse undersøkelsene har han benyttet geokjemiske prospekteringsmetoder i bekkesedimenter og bekkevann for om mulig å påvise nye mineraliseringer. Geologisk hører feltet inn under Komagfjord grunnfjellsvindu med lavmetamorfe suprakrustalbergarter. Geokjemiske anomalier skyldes hovedsakelig høy organisk andel i bekkesedimentene, utvasking fra gamle gruver og bergarter som dolomitt og skifer. Geofysiske helikoptermålinger utført av NGU ga ikke nye indikasjoner på malmmineraliseringer. De kjente reserver etter tidligere gruvedrift og påviste nye mineraliseringer av uran er for små til å være av økonomisk interesse i dag.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	FI0134.83-2	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	FI0134.83-3	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	FI0134.83-4	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	FI0134.83-5	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	FI0134.83-6	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	FI0134.83-7	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	FI0134.83-8	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	FI0134.83-9	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1
	HA-P-022	Bedrock	Sampler: KARLSTRØM/...Size(kg): 200 Comment: Store klyser av kobberkis omgitt av hematittutfellinger i kalkspatgang. Østlige tipp. No. of registrated element analyses = 1
	HA-P-023	Bedrock	Sampler: KARLSTRØM/...Size(kg): 200 Comment: Aggregater av cp. sammen med grønnsteinsfragmenter i kalkspatgang. Østlige tipp. No. of registrated element analyses = 1
	HA-P-024	Bedrock	Sampler: KARLSTRØM/...Size(kg): 200 Comment: Cp.-klyser i gang av perfekte kalkspatkrystaller og aktinolittnåler. Østlige tipp. No. of registrated element analyses = 1
	HA-P-025	Bedrock	Sampler: KARLSTRØM/...Size(kg): 200 Comment: Utfelling av hematitt med py.-korn og små cp.-klyser i kalkspatgang. En del serpentiniserte grønnsteinsfragmenter. Hovedtippen. No. of registrated element analyses = 1
	HA-P-026	Bedrock	Sampler: KARLSTRØM/...Size(kg): 200 Comment: Cp.-klyser i gangmasse av kalkspat (til dels rød) med omvandlete bergartsfragmenter og små mt.-krystaller. Hovedtipp. No. of registrated element analyses = 1
	83-1	Dump	Sampler: Pratt & Nielsen Comment: Kobbermineralisering i kvarts-karbonatgang No. of registrated element analyses = 1

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

Name of Locality: Greville grube

(Object Id: 939 25,01,00)

Location

County:

Finnmark

Municipality:

Hammerfest (5603)

Map 1:50000:

Vargsund (1935-4)

Map 1:250000:

Hammerfest

Coordinate system:

EU89-UTM Zone 34

East:

601694 m.

North:

7810376 m.

Longitude:

23.7142570

Latitude:

70.3787090

Show on map

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Copper
			Element(s):	Cu

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	HA-P-027	Bedrock	Sampler: KARLSTRØM/...Size(kg): 200 Comment: Kraftige utfellinger av hematitt og svovelkis sammen med omv. grønnsteinsfragmenter i kalkspatgang. En del mindre cp.aggregater. Greville grube. No. of registrated element analyses = 1
	HA-P-028	Bedrock	Sampler: KARLSTRØM/...Size(kg): 200 Comment: Cp.-aggregater i kalkspatgang. No. of registrated element analyses = 1

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

Name of Locality: Skjerp 2

(Object Id: 940 25,02,00)

Location

County:

Finnmark

Municipality:

Hammerfest (5603)

Map 1:50000:

Vargsund (1935-4)

Map 1:250000:

Hammerfest

Coordinate system:

EU89-UTM Zone 34

East:

601594 m.

North:

7810241 m.

Longitude:

23.7114310

Latitude:

70.3775400

Show on map

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Copper
			Element(s):	Cu

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	HA-P-029	Dump	Sampler: Karlstrøm, H. No. of registrated element analyses = 1
	HA-P-030	Dump	Sampler: Karlstrøm, H. No. of registrated element analyses = 1

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

---

Analyse Results

from

Deposit Area 5603 - 025 Porsa grube

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#
FI0134.83-2	Dump	11756	1	2	117	125	.4	15.0
FI0134.83-3	Dump	1559	6	2	11	17	.1	5.0
FI0134.83-4	Dump	711	18	2	23	27	.3	16.0
FI0134.83-5	Dump	2957	3	2	50	33	.4	21.0
FI0134.83-6	Dump	14848	5	2	5	18	.8	26.0
FI0134.83-7	Dump	16195	21	2	398	50	.8	88.0
FI0134.83-8	Dump	3828	3	2	5	8	.4	8.0
FI0134.83-9	Dump	6086	1	4	283	83	.5	33.0
HA-P-022	Bedrock	23815	59	2	524	289	3.2	695.0
HA-P-023	Bedrock	50174	141	2	30	45	3.8	1449.0
HA-P-024	Bedrock	19059	45	2	11	8	.5	1120.0
HA-P-025	Bedrock	1698	8	2	568	134	.3	50.0
HA-P-026	Bedrock	30501	81	2	248	202	1.3	476.0
HA-P-027	Bedrock	5018	14	2	382	69	.2	97.0
HA-P-028	Bedrock	26454	66	4	192	175	.9	457.0
HA-P-029	Dump	99999	679	2	25	19	19.4	10.0
HA-P-030	Dump	34048	94	5	9	5	5.2	363.0
83-1	Dump	99999	1	9	95	113	2.4	526.0

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

Sample No.	Pt#	Pd#	Rh#	As*	Cd*	Ba*	Mo*	Sb*	Bi*
FI0134.83-2	1.0	2.0	2.0	8	1.0	7	1.00	2	2
FI0134.83-3	14.0	15.0	2.0	2	1.0	11	1.00	3	3
FI0134.83-4	13.0	17.0	2.0	4	1.0	14	1.00	2	2
FI0134.83-5	1.0	2.0	2.0	6	1.0	5	1.00	2	2
FI0134.83-6	8.0	12.0	2.0	3	1.0	7	2.00	2	2
FI0134.83-7	1.0	3.0	2.0	18	5.0	2	1.00	2	2
FI0134.83-8	7.0	52.0	2.0	3	1.0	3	4.00	2	6
FI0134.83-9	1.0	9.0	2.0	10	3.0	5	1.00	2	2
HA-P-022	1.0	11.0	1.0	34	2.2	4	1.00	2	2
HA-P-023	1.0	19.0	1.0	2	5.1	5	1.00	2	18
HA-P-024	1.0	1.0	1.0	2	1.5	4	1.00	2	4
HA-P-025	1.0	17.0	1.0	10	.8	4	1.00	2	5
HA-P-026	1.0	83.0	1.0	42	2.5	11	1.00	2	18
HA-P-027	1.0	1.0	1.0	2	.8	3	2.00	2	7
HA-P-028	1.0	12.0	1.0	13	2.4	5	1.00	2	8
HA-P-029	1.0	1.0	1.0	4	17.9	3	1.00	2	2
HA-P-030	1.0	1.0	1.0	3	3.2	9	1.00	2	17
83-1	1.0	2.0	2.0	4	1.0	10	1.00	2	46

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

Sample No.	S%	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*
FI0134.83-2	2.80	42	1	516	9.84	1.00	5.00	1	5.0
FI0134.83-3	.11	61	31	153	2.69	1.00	5.00	1	2.0
FI0134.83-4	.14	65	26	235	4.03	1.00	5.00	1	24.0
FI0134.83-5	.84	31	1	1244	4.86	2.00	6.00	1	29.0
FI0134.83-6	1.11	39	19	495	2.82	2.00	5.00	1	15.0
FI0134.83-7	5.63	25	1	1062	23.80	4.00	12.00	1	26.0
FI0134.83-8	.26	36	13	325	2.31	1.00	5.00	1	10.0
FI0134.83-9	5.23	87	1	570	33.49	4.00	7.00	2	12.0
HA-P-022	11.44	30	26	1826	19.72	1.00	5.00	1	28.0
HA-P-023	12.28	7	3	1933	10.50	1.00	5.00	1	44.0
HA-P-024	2.46	4	2	2416	2.78	1.00	5.00	1	57.0
HA-P-025	10.51	94	32	551	34.26	1.00	5.00	1	13.0
HA-P-026	7.83	54	20	523	14.20	1.00	5.00	1	14.0
HA-P-027	10.13	69	20	664	27.57	1.00	5.00	1	9.0
HA-P-028	9.16	12	10	2154	9.22	1.00	5.00	1	51.0
HA-P-029	39.69	2	1	195	27.93	1.00	5.00	1	1.0
HA-P-030	4.68	1	1	2419	3.98	1.00	5.00	1	79.0
83-1	26.10	8	1	213	21.06	2.00	5.00	1	2.0

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

Sample No.	La*	B*	Na*	Mg*	Al*	P*	K *	Ca*	Ti*
FI0134.83-2	2.00	2	0	0	0	0	0	2	0
FI0134.83-3	4.00	2	0	0	0	0	0	1	0
FI0134.83-4	3.00	2	0	1	1	0	0	1	0
FI0134.83-5	2.00	2	0	0	0	0	0	14	0
FI0134.83-6	2.00	2	0	0	0	0	0	5	0
FI0134.83-7	2.00	2	0	0	0	0	0	11	0
FI0134.83-8	2.00	2	0	0	0	0	0	3	0
FI0134.83-9	2.00	4	0	0	0	0	0	4	0
HA-P-022	2.00	2	0	0	0	0	0	13	0
HA-P-023	2.00	3	0	0	0	0	0	18	0
HA-P-024	2.00	2	0	0	0	0	0	27	0
HA-P-025	2.00	2	0	0	0	0	0	4	0
HA-P-026	2.00	2	0	0	0	0	0	5	0
HA-P-027	2.00	2	0	0	0	0	0	3	0
HA-P-028	2.00	2	0	0	0	0	0	25	0
HA-P-029	2.00	2	0	0	0	0	0	0	0
HA-P-030	2.00	2	0	0	0	0	0	33	0
83-1	2.00	3	0	0	0	0	0	1	0

---

The fact sheet was created on 02.05.2024

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

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