Fact Sheet for <b>Deposit 0

					Norsk versjon
	THE ???? DATABASE
	Deposit 0 - 000 FEIL
	(Object Id: ) (Last updated: 10.06.2022)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Askim (1914-2)

Map 1:250000:

Oslo

Coordinate system:

UTM-Zone 33 - EUREF89/WGS84

East:

619020 m.

North:

6607420 m.

Longitude:

11.1079100

Latitude:

59.5880220

Show on map

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)

Historical:

Yes , (Confirmed 29.mai.2001 by Lars Petter Nilsson)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:	13,2 thousand tons

Products

Element/product Crude ore grade or quality Reg. date

Cu 0.4 % 20.09.2012

Ni 1.07 % 18.02.2005

Mineralization

Era: Proterozoic Period: Paleoproterozoic

Genesis: Orthomagmatic formation Form: Irregular

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

Main grain size: Fine grained (< 1 mm) Main alteration: No country rock alteration

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Proterozoic Period: Paleoproterozoic

Province: East Norwegian Basement Province

Geotec.unit: Østfold Complex

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Plagioclase Major mineral (>10%)

Gangue mineral Pyroxene Major mineral (>10%)

Gangue mineral Biotite Subordinate mineral (1-10%)

Gangue mineral Quartz Accessory mineral (<1%)

Ore mineral Pyrrhotite Major mineral (>10%)

Ore mineral Cobalt pentlandite Subordinate mineral (1-10%)

Ore mineral Pentlandite Subordinate mineral (1-10%)

Ore mineral Chalcopyrite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Host rock diorite Intrusive
Original rock :Diorite

Structures

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

Host rock Rock contact Syn-mineralisation

Information(s) in free text format

Description

Romsås The Romsås nickel deposit, though itself not impressive by size, is by far the largest of the nickel sulphide occurrences in Indre Østfold. It is situated within a minor quartz noritic body of assumed Mesoproterozoic age surrounded by migmatitic gneisses of presumed sedimentary origin on the regional map of Berthelsen et al. (1996) interpreted as Mesoproterozoic greywacke-dominated metasediments (Bingen et al. 2005). Neither the Romsås body, nor any of the other nickel sulphide ore-bearing mafic bodies in Østfold, are dated to the knowledge of the present writer. Therefore, the 1555 +3/-2 Ma Follum dioritic intrusion in the Begna sector in the NW is the one closest comparable both in space and time to the mafic intrusions in Indre Østfold. The Romsås deposit is most famous for its orbicular norite, developed mostly along the western margin of the intrusion, but also in the inner parts of the body. The orbicular norite is partly cut by the sulphide ore zones and is partly cutting these (Støren 1909). No exhaustive modern studies are undertaken on the Romsås body with its sulphide mineralization, but a wealth of classic works, mainly descriptive, both on this one and other nickel bearing intrusions in Norway exist from professor Vogt and other Norwegian pioneer geologists. The most recent description of Romsås is that found in the review paper by Boyd & Nixon (1985).

Historical significance

History of mining The company Roms Nikkelverk (Roms Nickelworks) commenced mining on the Romsås deposit in 1866 and kept a continuous activity running until the nickel crack in 1876. During the first seven years only test mining was carried out. In 1873 full-scale mining started, and that year the company also built its own smelter (Meinich 1879). In 1875 all together 122 men were employed at the company, 74 at the mines (i.e. the main mine at Romsås and a much smaller mine at Frøland), and 48 at the smelter (Helland 1900). After the big nickel crack in 1876 the Romsås deposit closed down and never came into production again. Total ore production from the Romsås deposit accumulated to 13 205 tons with a nickel content of c. 125 - 130 tons. Total production from all the company's mines during the period 1866-76 was, according to official statistics, 16 465 tons with a Ni content of c. 150 tons. The average ore grade at Romsås was 1.07 % Ni (+ Co) and 0.4 % Cu (Vogt 1902, Meinich & Vogt 1903). Pyrrhotite, pentlandite and chalcopyrite constitute the main ore minerals in the Romsås ore, whereas pyrite constitutes a rare, secondary constituent according to Meinich (l879, p. 128).

Bibliography:

From NGU's Reference Archive:

Carstens, Harald , 1957

On the orbicular structure in the norite of Romsaas, Norway.

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.37 (2);279-280 pages

Abstract:

Frie emneord: Noritt

Egeberg, K. , 1902

Romsås grube. Geologisk plankart med daganlegg 1:1 000.

;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 1089

Andresen, Unni ; Sørlie, Thor , 2009

Romsåsen gruver

;Norske Amatørgeologers Sammenslutning (NAGS);ARTIKKEL;Stein; No.36 (2);20-25 pages

Abstract:

Singsaas, Per , 1974

Geofysiske målinger Romsås grube.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1221;7 pages

Boyd, R.; Nixon, F. , 1985

Norwegian nickel deposits: a review.

;Geologian Tutkimuskeskus / Geological Survey of Finland;ARTIKKEL;Bulletin; Nickel-copper deposits of the Baltic Shield and Scandinavian; Caledonides.; No.333;363-394 pages

Meinich, L. , 1903

Les qisements de nickel de Romsaas, Smaalene, Norvege.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1428;8 pages

Abstract:

Rapporten beskriver: - tidligere drift (inkl. tonnasje og gehalt) - forekomstens beliggenhet - geologien (malmens utbredelse, mektighet, malmtype og opptreden) - framtidige undersøkelser.

Thorkildsen, Birger , 1913

Rapport over Romsaas Gruber.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 4045;2 pages

Abstract:

Forekomstene i Romsåsen ligger på kontakten mellom gneis og noritt. Mot gneisen finnes først kulenoritt og innenfor denne forekommer malmen. Malmen består for en stor del av impregnassjonsmalm. En rekke paralelle malmsoner ser ut til å stå vinkelrett på kontakten. Orter og synker er drevet på sonene. I et parti under den dypeste stollen inneholder malmen 3% nikkel og kobolt. Norittfeltet er lite i forhold til feltene i Evje. Det er tidliger brudt 16 465 tonn malm i gruven, man fikk da 1,08 tonn pr. m3 med en nettogehalt på 1,07% Ni og 0,4% Cu.

Berthelsen, Asger; Olerud, Svein; Sigmond, Ellen M.O.; Sundvoll, Bjørn , 1996

Oslo. Berggrunnskart Oslo M 1:250 000; trykt i farger

;Norges geologiske undersøkelse;KART;1 kart pages

Abstract:

Beskrivelsen finnes på kartet.

Bingen, Bernard; Skår, Øyvind; Marker, Mogens; Sigmond, Ellen M. O.; Nordgulen, Øystein; Ragnhildstveit, Jomar; Mansfeld, Joakim; Tucker, Robert D.; Liegeois, Jean Paul , 2005

Timing of continental building in the Sveconorwegian orogen, SW Scandinavia

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.85(1/2);87-105 pages

Abstract:

The timing of continental building in the Sveconorwegian orogen of SW Scandinavia is evaluated with zircon U-Pb geochronology. ID-TIMS, LA-ICPMS and SIMS data are reported for 21 samples of orthogneiss, metahyolite and metasandstone in S Norway, with emphasis on the Suldal area. The Sveconorwegian orogen is divided into a reworked Fennoscandian 1,80-1,64 GA parautochtonous segment, the Eastern Segment, and two allochtthonous terranes. The Idefjorden terrane is interpreted as a compsite 1.66-1.52 Ga arc formed at the margin or near the margin of Fennoscandia. The western terrane, including the Telemark, Hardangervidda, Suldal and Rogaland - Vest Agder sectors, is named Telemarkia. U-BPb zircon data indicate that Telemarkia was built during a short magmatic event between 1.52 and 1.48 Ga, and was located at the margin of a Palaeoproterozoic craton, possibly Fennoscandia. No basement older than 1.5 Ga can be positively identified. In the early stage of the Sveconorwegian orogeny, Telemarkia collided with the Idefjorden terrane. The Bamble-Kongsberg sector, characterized by a mixed lithology and 1.13-1.10 Ga early-Sveconorwegian high-grade metamorphism, is interpreted as the original collision zone between these terranes.

Helland, Amund , 1900

Bergverksdrift og stenbrydning i Norge

;Bergens Museum;ARTIKKEL;Naturen; No.24 (5);139-150 pages

Støren, R. , 1909

Romsås grube. Geologisk gruvekart i plan og profil, 1:1 000.

;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 1087

Støren, R. , 1909

Romsås grube. Geologisk gruvekart i plan og profil, 1:500.

;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 1086 A-E

Fieldsamples

Sample No. Sample type Miscellanrous

JS-ROM2101 Bedrock

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

Comment: Semi-massive/dissemination of pyrrhotite+chalcopyrite, fine-/medium grained

No. of registrated element analyses = 1

JS-ROM2106 Bedrock

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

Comment: Massiv pyrrhotite-chalcopyrite

No. of registrated element analyses = 1

ROMSAS99-1 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

ROMSAS99-2 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

ROMSAS99-3 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

ROMSAS99-4 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

ROMSAS99-5 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

ROMSAS99-6 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

ROMSAS99-7 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

ROMSAS99-8 Dump

Sampler: Lars Petter Nilsson

Comment: Utplukket malm fra tippen

No. of registrated element analyses = 1

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

Name of Locality: Øvre stoll

(Object Id: 38625 2,01,00)

Location

County: Municipality: Mangler ()

Map 1:50000: Askim (1914-2) Map 1:250000: Oslo

County: UTM-Zone 33 - EUREF89/WGS84

Resource

Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel

Element(s): Ni Cu Co

Resources and production

Activity: Mining Reserves:

Operating method: Open pit and underground mining Historical production:

Fieldsamples

Sample No. Sample type Miscellanrous

JS-ROM2105 Bedrock

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

Comment: Semi-massive pyrrhotite+chalcopyrite, net-textured, in contact to fine-grained gabbro

No. of registrated element analyses = 1

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

Name of Locality: Stoll i sørøst

(Object Id: 38626 2,02,00)

Location

County: Municipality: Mangler ()

Map 1:50000: Askim (1914-2) Map 1:250000: Oslo

County: UTM-Zone 33 - EUREF89/WGS84

Resource

Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel

Element(s): Ni Cu Co

Resources and production

Activity: Mining Reserves:

Operating method: Open pit and underground mining Historical production:

Fieldsamples

Sample No. Sample type Miscellanrous

JS-ROM2102 Bedrock

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

Comment: Pyrrhotite dissemination/aggregates in plagioclase-rich norite

No. of registrated element analyses = 1

JS-ROM2103 Bedrock

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

Comment: Semi-massive/aggregates/dissemination of pyrrhotite+chalcopyrite in plagioclase-rich norite

No. of registrated element analyses = 1

JS-ROM2104 Bedrock

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

Comment: Massive/semi-massiev pyrrhotite+chalcopyrite, medium-/coarse-grained

No. of registrated element analyses = 1

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

Element/product	Crude ore grade or quality	Reg. date
Cu	0.4 %	20.09.2012
Ni	1.07 %	18.02.2005

Era:	Proterozoic	Period:	Paleoproterozoic
Genesis:	Orthomagmatic formation	Form:	Irregular
Main texture:	Structureless	Min. distribution:	Semi-massive (20-50 % ore minerals)

	Province:	East Norwegian Basement Province
	Geotec.unit:	Østfold Complex
	Tectonic complex:
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Plagioclase	Major mineral (>10%)
Gangue mineral	Pyroxene	Major mineral (>10%)
Gangue mineral	Biotite	Subordinate mineral (1-10%)
Gangue mineral	Quartz	Accessory mineral (<1%)
Ore mineral	Pyrrhotite	Major mineral (>10%)
Ore mineral	Cobalt pentlandite	Subordinate mineral (1-10%)
Ore mineral	Pentlandite	Subordinate mineral (1-10%)
Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)

	Relationship	Rock	Origin
	Host rock	diorite	Intrusive Original rock :Diorite

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Rock contact		Syn-mineralisation

	Abstract:
	Rapporten beskriver: - tidligere drift (inkl. tonnasje og gehalt) - forekomstens beliggenhet - geologien (malmens utbredelse, mektighet, malmtype og opptreden) - framtidige undersøkelser.