Fact Sheet for Deposit Area 522

					Norsk versjon
	THE ORE DATABASE
	Deposit Area 522 - 013
	(Last updated 13.mar.2024)

Name of Deposit Area : Storgruva

(Object Id : 0522,013,00,00)

Location

County :

Oppland (05)

Municipality :

Gausdal (0522)

Map 1:50000:

Svatsum (1717-1)

Map 1:250000:

Lillehammer

Marking point:

Longitude:

9.6025830

Latitude:

61.4070470

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

532173 m.

Y-coord:

6808276 m.

Commodity

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

Production

Activity:	Mining	Reserves:
Prod. method:	Underground mining	Production:	15 thousand tons
Prod. status:	Disused, closed	Volume of dump:

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 0,08 %

CU 0,6 %

NI 1,9 %

Operations

From - To Activity Comments

1665 - 1666 Test mining

1847 - 1855 Regular production Company/Institution :Espedals Værk

Produced 11510 tonnes of ore.

1874 - 1876 Regular production Company/Institution :Espedalens Nikkelværk

Produced 3503 tonnes of ore.

2007 - 2007 Core drilling Company/Institution :Blackstone Ventures Ltd

12 hull

Mineralization

Era: Proterozoic Period: Mesoproterozoic

Dating: Method:

Genesis: Orthomagmatic formation Form: Plate

Main texture: Massive Min. distribution: Semi-massive (20-50 % ore minerals)

Main grain size: Medium grained (1-3 mm) Main alteration:

Strike/Dip: 260 / 25 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Proterozoic Period: Mesoproterozoic

Province: Caledonian Basement Province

Geotec.unit: Jotun Nappe Complex

Tectonic complex: Espedalen Complex

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Pyroxene Major mineral (>10%)

Gangue mineral Amphibole Subordinate mineral (1-10%)

Gangue mineral Feldspar Subordinate mineral (1-10%)

Ore mineral Pyrrhotite Major mineral (>10%)

Ore mineral Pentlandite Subordinate mineral (1-10%)

Ore mineral Chalcopyrite Subordinate mineral (1-10%)

Ore mineral Pyrite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Host rock Harzburgite Intrusive
Original rock :Peridotite

Metamorphic facies :Amphibolite

Wall rock Anorthosite Intrusive

Metamorphic facies :Amphibolite

Information(s) in free text format

Free text

The Espedalen Ni-Cu district is situated in an outlier of the Jotun Nappe Complex and consists of Proterozoic crustal rocks; mainly a high-grade anorthosite-gabbro-troctolite suite. Magmatic Ni-Cu sulphides have been mined in several periods in the region. Copper smelting is documented at Svatsum in 1665–1666 with description of ongoing mining of unknown duration. The first analysis and description of a new Ni-mineral, later named pentlandite, was reported from Espedalen by Scheerer (1845). The findings resulted in two mining periods of nickeliferous pyrrhotite (1846 to 1857 and 1874 to 1878) from Storgruva, Veslegruva and a number of smaller workings, making Espedalen one of the major mining districts at that time (up to 500 workers). An estimated total of about 50.000 tons of ore with 1.0 % Ni, 0.4 % Cu was produced. Modern exploration started in the late 1960s. Sulfidmalm and Norsk Hydro did extensive exploration until 1980. The latest period of exploration by Blackstone Ventures Inc. started in 2003 and has so far resulted in the discovery of two new deposits, Stormyra and Dalen. The inferred resources in the Stormyra deposit is 1.013 mill.t. with 1.09 % Ni, 0.48 % Cu and 0.04 % Co and at Dalen 4.625 mill.t. with 0.29 % Ni, 0.12 % Cu and 0.02 % Co. Drake refined the Mineral Resources at Stormyra (1.16Mt @ 1% Ni, 0.42% Cu & 0.04% Co) and Dalen (7.8Mt @ 0.28% Ni, 0.12% Cu & 0.02% Co) prospects in accordance with JORC (2012).

Historic

An account book for the years 1665-1666 from the Copper smelter at Masovn in Svatsum describes ongoing mining allready then. Veslegruva (The small mine) and Storgruva (The big Mine) were old and well known long before the nickel mining by the company Espedals Værk started. Total ore production from the Storgruva/Evans mine was about 15 000 tons, of which 12 000 were produced during 1847-1856 and 3 000 in the last period of production, 1874-1878.

Bibliography:

From NGU's Reference Archive:

Braastad, J.; Gruholt, A.; Kiil, E. , 1936

Rapport over befaring av Espedalen nikkel-magnetkisfelter.

;Norges geologiske undersøkelse;RAPPORT;Bergarkivet; No.BA 836;15 pages

Abstract:

Lok. Nr. 10073, 10078. Rapporten refererer observasjoner gjort av forfatterne under en befaring av Espedalfeltet 22 - 28. 8. 1936. Vedlagt følger utdrag fra tidligere beretninger inklusivt produksjonsstatistikk.

Vogt, J.H.L. , 1917

Espedalen Nikkel-magnetkisfelt.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1419;27 pages

Abstract:

Lok. Nr. 10073 - 10078. Rapporten har følgende inndeling: - Beliggenhet. - Om verkets drift i eldre dager. - Om vannkraft osv. - Malmforekomstens geologiske karakter. - Malmens nikkelprosent. - Veslegruben. - Evans grube. - Stangs grube. - Andreasberg. - Oversikt.

References not to be found in NGU's Reference Archive.:

Corfu, F., & Heim, M. 2014. Geology and U–Pb geochronology of the Espedalen Complex, southern Norway, and its position in the Caledonian nappe systems. Geological Society, London, Special Publications, 390(1), 223-239. https://doi.org/10.1144/jgs2019-010

Mansur, E.T., Slagstad, T., Dare, S.A.S. & Sandstad, J.S. 2023. Geology and sulphide geochemistry of the Ni-Cu-Co mineralisation of the Espedalen Complex, Norway: Constraints for the distribution of magmatic sulphides within a variably deformed anorthosite suite. Ore Geology Reviews 161.

Forseth, Iver, 2004: Nikkelverket i Espedalen. Dølaringen boklag. 140s.

Fieldsamples

Sample No. Sample type Miscellanrous

JS-ES2219 Dump

Sampler :Sandstad/Mansur/...Stored :Løkken/...Size(kg) :2

Comment :Massive pyrrhotite+chalcopyrite

No. of registrated element analyses = 1

JS-ES2220 Bedrock

Sampler :Sandstad/Mansur/...Stored :Løkken/...Size(kg) :2

Comment :Disseminated/aggregates pyrrhotite+chalcopyrite in melanogabbro

No. of registrated element analyses = 1

JS-ES2221 Dump

Sampler :Sandstad/Mansur/...Stored :Løkken/...Size(kg) :2

Comment :Massive, very fine-grained pyrrhotite+chalcopyrite

No. of registrated element analyses = 1

JS-ES2222 Dump

Sampler :Sandstad/Mansur/...Stored :Løkken/...Size(kg) :2

Comment :Disseminated/aggregates pyrrhotite+chalcopyrite in melanogabro

No. of registrated element analyses = 1

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

Name of Locality : Storgruva sørøst

(Object Id : 0522,013,01,00)

Location

County : Oppland (05) Municipality : Gausdal (0522)

Map 1:50000: Svatsum (1717-1) Map 1:250000: Lillehammer

Marking point: Longitude: 9.6085960 Latitude: 61.4061220

EU89-UTM Zone 32 (Coordinates IS confirmed)

X-coord: 532495 m. Y-coord: 6808175 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: 30 m3

Information(s) in free text format

Free text

En mindre vannfylt synk ligger ca. 300 m østsørøst for Storgruva. Den har sidevegger som er 5x3 m lange, og en tipp med volum omkring 30 m3. Finkornet gabbronoritt med disseminasjon av magnetkis og kobberkis finnes i tippen, mens området omkring domineres av blokker med anortositt.

Analyse Results

from

Deposit Area 522 - 013 Storgruva

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#

JS-ES2219 Dump 6240 28 6 789 13800 1.8 55.0

JS-ES2220 Bedrock 7060 72 4 481 8430 1.4 5.0

JS-ES2221 Dump 4840 36 9 1130 19700 2.4 11.0

JS-ES2222 Dump 4470 48 3 366 5810 1.1 10.0

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

Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* Se*

JS-ES2219 12.0 44.0 -0 .5 20 0.58 0 1 16.00

JS-ES2220 18.0 10.0 0 .5 20 0.46 0 0 9.00

JS-ES2221 23.0 11.0 -0 .2 20 0.76 -0 1 20.00

JS-ES2222 16.0 28.0 1 .6 20 0.39 -0 0 8.00

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

Sample No. Ga* Ge* S% V* Cr* Mn* Fe% Th* Rb*

JS-ES2219 5.19 0.23 9.54 167 1110 915 25.60 0.11 0.7

JS-ES2220 4.66 0.17 6.98 150 2590 866 16.60 0.16 1.1

JS-ES2221 5.49 0.34 14.35 117 1060 842 31.10 0.12 0.8

JS-ES2222 5.45 0.12 4.87 157 2350 887 13.60 0.21 1.3

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

Sample No. Sr* Y* Zr* Nb* Ta* Cs* La* Ce* Li*

JS-ES2219 29.9 5.4 10 0.30 -0.05 -0.05 1.20 3.73 4

JS-ES2220 57.2 4.6 9 0.20 -0.05 0.11 1.00 3.04 2

JS-ES2221 28.7 4.6 7 0.40 -0.05 0.16 1.10 3.36 2

JS-ES2222 57.3 5.1 12 0.40 -0.05 0.13 1.60 4.31 2

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

Sample No. Be* Mg* Al* P* Ca* Sc* Ti* Te* Hf*

JS-ES2219 0 62200 23000 70 87700 40.90 1490 0.62 0.40

JS-ES2220 0 93500 20600 70 95700 42.10 1260 0.36 0.30

JS-ES2221 0 62600 22800 60 49200 25.20 1660 0.85 0.30

JS-ES2222 0 ###### 22400 130 90600 41.40 1450 0.41 0.40

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

Sample No. Re* Tl*

JS-ES2219 0 0

JS-ES2220 0 0

JS-ES2221 0 0

JS-ES2222 0 0

	Element/product	Crude ore grade or quality
	CO	0,08 %
	CU	0,6 %
	NI	1,9 %

From - To	Activity	Comments
1665 - 1666	Test mining
1847 - 1855	Regular production	Company/Institution :Espedals Værk
		Produced 11510 tonnes of ore.
1874 - 1876	Regular production	Company/Institution :Espedalens Nikkelværk
		Produced 3503 tonnes of ore.
2007 - 2007	Core drilling	Company/Institution :Blackstone Ventures Ltd
		12 hull

Era:	Proterozoic	Period:	Mesoproterozoic
Dating:		Method:
Genesis:	Orthomagmatic formation	Form:	Plate
Main texture:	Massive	Min. distribution:	Semi-massive (20-50 % ore minerals)

	Province:	Caledonian Basement Province
	Geotec.unit:	Jotun Nappe Complex
	Tectonic complex:	Espedalen Complex
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Pyroxene	Major mineral (>10%)
Gangue mineral	Amphibole	Subordinate mineral (1-10%)
Gangue mineral	Feldspar	Subordinate mineral (1-10%)
Ore mineral	Pyrrhotite	Major mineral (>10%)
Ore mineral	Pentlandite	Subordinate mineral (1-10%)
Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
Ore mineral	Pyrite	Subordinate mineral (1-10%)

Relationship	Rock	Origin
Host rock	Harzburgite	Intrusive Original rock :Peridotite
		Metamorphic facies :Amphibolite
Wall rock	Anorthosite	Intrusive
		Metamorphic facies :Amphibolite

	Abstract:
	Lok. Nr. 10073, 10078. Rapporten refererer observasjoner gjort av forfatterne under en befaring av Espedalfeltet 22 - 28. 8. 1936. Vedlagt følger utdrag fra tidligere beretninger inklusivt produksjonsstatistikk.

	Abstract:
	Lok. Nr. 10073 - 10078. Rapporten har følgende inndeling: - Beliggenhet. - Om verkets drift i eldre dager. - Om vannkraft osv. - Malmforekomstens geologiske karakter. - Malmens nikkelprosent. - Veslegruben. - Evans grube. - Stangs grube. - Andreasberg. - Oversikt.

Activity:	Pitting	Reserves:
Prod. method:		Production:
Prod. status:		Volume of dump:	30 m3

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
JS-ES2219	Dump	6240	28	6	789	13800	1.8	55.0
JS-ES2220	Bedrock	7060	72	4	481	8430	1.4	5.0
JS-ES2221	Dump	4840	36	9	1130	19700	2.4	11.0
JS-ES2222	Dump	4470	48	3	366	5810	1.1	10.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	Se*
JS-ES2219	12.0	44.0	-0	.5	20	0.58	0	1	16.00
JS-ES2220	18.0	10.0	0	.5	20	0.46	0	0	9.00
JS-ES2221	23.0	11.0	-0	.2	20	0.76	-0	1	20.00
JS-ES2222	16.0	28.0	1	.6	20	0.39	-0	0	8.00

Sample No.	Ga*	Ge*	S%	V*	Cr*	Mn*	Fe%	Th*	Rb*
JS-ES2219	5.19	0.23	9.54	167	1110	915	25.60	0.11	0.7
JS-ES2220	4.66	0.17	6.98	150	2590	866	16.60	0.16	1.1
JS-ES2221	5.49	0.34	14.35	117	1060	842	31.10	0.12	0.8
JS-ES2222	5.45	0.12	4.87	157	2350	887	13.60	0.21	1.3

Sample No.	Sr*	Y*	Zr*	Nb*	Ta*	Cs*	La*	Ce*	Li*
JS-ES2219	29.9	5.4	10	0.30	-0.05	-0.05	1.20	3.73	4
JS-ES2220	57.2	4.6	9	0.20	-0.05	0.11	1.00	3.04	2
JS-ES2221	28.7	4.6	7	0.40	-0.05	0.16	1.10	3.36	2
JS-ES2222	57.3	5.1	12	0.40	-0.05	0.13	1.60	4.31	2

Sample No.	Be*	Mg*	Al*	P*	Ca*	Sc*	Ti*	Te*	Hf*
JS-ES2219	0	62200	23000	70	87700	40.90	1490	0.62	0.40
JS-ES2220	0	93500	20600	70	95700	42.10	1260	0.36	0.30
JS-ES2221	0	62600	22800	60	49200	25.20	1660	0.85	0.30
JS-ES2222	0	######	22400	130	90600	41.40	1450	0.41	0.40