Fact Sheet for <b> 5025 - 070 Feragen kromfelt</b>

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	THE ORE DATABASE
	5025 - 070 Feragen kromfelt
	(Object Id: 36540) (Last updated: 06.08.2018)

Belongs to the Province: Feragen kromfelt

Location

County:

Trøndelag

Municipality:

Rosse (5025)

Map 1:50000:

Brekken (1720-2)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

642018 m.

North:

6936592 m.

Longitude:

11.7603980

Latitude:

62.5329710

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Resource

	Resource Type:	Ferroalloys (Cr,Ni,Co,V,Mo,W)	Resource Subtype:	Chromium
			Element(s):	Cr

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Products

Element/product Crude ore grade or quality Reg. date

Cr 26.7 % 18.03.2024

Mineralization

Genesis: Form:

Main texture: Min. distribution:

Main grain size: Main alteration:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Information(s) in free text format

Free text

The Feragen chromium ore field is associated with the large bodies of ultramafic rocks, mainly altered to serpentinites, located to the SE of Røros. The main rock types are variably serpentinized dunite and peridotite (cpx-bearing harzburgite to cpx-poor lherzolite). Cr-ores int the form of chromite are exclusively hosted in the dunite. Typical podiform ores predominate, though semi-stratiform ore bodies are also present. Ore-types include fine-grained impregnations, banded and semimassive/massive (> 55% Cr-oxide) types. Generally the chromite-ores have low PGE values (0.1-0.2 ppm), except the Osthammeren deposit, which has an average grade of 1.5 ppm total PGE. Between 1820 and 1940 27 500 – 32 500 t of chromium ore was produced from mainly three mines (Leigh, Ler and Skal mines).

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Brekken (1720-2) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 643518 m. North: 6940242 m.

Longitude: 11.7925800 Latitude: 62.5651150

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Resource

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

Element(s): Cr

Importance

Raw material meaning: Little Importance (reg. 18.02.2015)

Products

Element/product Crude ore grade or quality Reg. date

Cr 27 % 10.05.2007

Mineralization

Era: Paleozoic Period:

Genesis: Orthomagmatic formation Form:

Main texture: Min. distribution:

Main grain size: Main alteration:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Ore mineral Chromite Major mineral (>10%)

Information(s) in free text format

Free text

The Feragen chromium ore field is associated with the large bodies of ultramafic rocks, mainly altered to serpentinites, located to the SE of Røros. The main rock types are variably serpentinized dunite and peridotite (cpx-bearing harzburgite to cpx-poor lherzolite). Cr-ores int the form of chromite are exclusively hosted in the dunite. Typical podiform ores predominate, though semi-stratiform ore bodies are also present. Ore-types include fine-grained impregnations, banded and semimassive/massive (> 55% Cr-oxide) types. Generally the chromite-ores have low PGE values (0.1-0.2 ppm), except the Osthammeren deposit, which has an average grade of 1.5 ppm total PGE. Between 1820 and 1940 27 500 – 32 500 t of chromium ore was produced from mainly three mines (Leigh, Ler and Skal mines).

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Brekken (1720-2) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 644918 m. North: 6940392 m.

Longitude: 11.8199090 Latitude: 62.5659130

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Resource

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

Element(s): Cr

Importance

Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production

Activity: Mining Reserves:

Operating method: Historical production:

Mineralization

Genesis: Form:

Main texture: Min. distribution:

Main grain size: Main alteration:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Information(s) in free text format

Free text

The Feragen chromium ore field is associated with the large bodies of ultramafic rocks, mainly altered to serpentinites, located to the SE of Røros. The main rock types are variably serpentinized dunite and peridotite (cpx-bearing harzburgite to cpx-poor lherzolite). Cr-ores int the form of chromite are exclusively hosted in the dunite. Typical podiform ores predominate, though semi-stratiform ore bodies are also present. Ore-types include fine-grained impregnations, banded and semimassive/massive (> 55% Cr-oxide) types. Generally the chromite-ores have low PGE values (0.1-0.2 ppm), except the Osthammeren deposit, which has an average grade of 1.5 ppm total PGE. Between 1820 and 1940 27 500 – 32 500 t of chromium ore was produced from mainly three mines (Leigh, Ler and Skal mines).

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Brekken (1720-2) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 645568 m. North: 6939392 m.

Longitude: 11.8316860 Latitude: 62.5566930

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Resource

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

Element(s): Cr

Importance

Raw material meaning: Little Importance (reg. 18.02.2015)

Mineralization

Genesis: Form:

Main texture: Min. distribution:

Main grain size: Main alteration:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Information(s) in free text format

Free text

The Feragen chromium ore field is associated with the large bodies of ultramafic rocks, mainly altered to serpentinites, located to the SE of Røros. The main rock types are variably serpentinized dunite and peridotite (cpx-bearing harzburgite to cpx-poor lherzolite). Cr-ores int the form of chromite are exclusively hosted in the dunite. Typical podiform ores predominate, though semi-stratiform ore bodies are also present. Ore-types include fine-grained impregnations, banded and semimassive/massive (> 55% Cr-oxide) types. Generally the chromite-ores have low PGE values (0.1-0.2 ppm), except the Osthammeren deposit, which has an average grade of 1.5 ppm total PGE. Between 1820 and 1940 27 500 – 32 500 t of chromium ore was produced from mainly three mines (Leigh, Ler and Skal mines).

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Brekken (1720-2) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 645168 m. North: 6939242 m.

Longitude: 11.8237890 Latitude: 62.5555060

Show on map

Resource

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

Element(s): Cr

Importance

Raw material meaning: Little Importance (reg. 18.02.2015)

Bibliography:

From NGU's Reference Archive:

Logn, Ø.; Brækken, H. , 1951

Forsøksmålinger Feragen Kromfelt, Brekken

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.50;12 pages

Abstract:

Undersøkelsene inngår i en serie forsøksmålinger ( Råna, Feragen, Ertelien, Høgåsen, Skjækerdalen) med det formål å undersøke geofysiske metoders an- vendbarhet for påvisning av nikkel- og kromforekomster. Feragen kromfelt er beskrevet av bergingeniør G. Engzelius (eksamenarbeide NTH 1940) og av dr. G. Richter (tysk, datert Oslo 1943). I en peridotitt- formasjon av omfang 5,3 x 3,2 km ligger en rekke skjerp og gruber hvor det vesentlig i forige århundre, har foregått drift på krom. Ved foreliggende undersøkelse ble det utført magnetiske og elektromagnetiske målinger samt elektriske feltkvotientmålinger i et område som er ca. 1,8 km2 i utstrekning. Man var påforhånd klar over at utsiktene til positive resul- tater av undersøkelsene måtte betegnes som mindre lovende. Dette er blitt bekreftet idet ingen av de metoder som ble forsøkt viste seg å være egnet for påvisning av krom.

Nilsson, Lars Petter , 1978

En malmgeologisk undersøkelse av Kromittforekomstene i Feragenfeltet med henblikk på å bestemme eventuelle økonomiske produkter.

;NTH Bergavd.;AVHANDLING

Eidsvig, Per , 1969

Måling av spesifikk motstand på prøver fra Feragen kromfelt.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.883;11 pages

Abstract:

MMålingene foregikk i NGU's laboratorium og i alt 11 prøver ble undersøkt. De utførte målinger viser at malmprøvene stort sett har samme ledningsevne som den omgivende bergart. Det er derfor sannsynlig at indusert poarisasjon (IP-målinger) er den eneste elektriske prospekteringsmetode som det er grunn til å forsøke i Feragenfeltet.

Korneliussen, Are; Nilsson, Lars P. , 1981

Røros-Feragen-områdets ultramafiske bergarter og kromitt-forekomster. Røros kommune, Sør-Trøndelag.

;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.1750/33E;14 pages

Abstract:

I forbindelse med undersøkelser av Statens bergrettigheter på kromitt i Røros-Feragen-området er det i perioden 1977-1979 foretatt geologiske og geofysiske (IP, magnetometri, EM, radiometri, gravimetri) undersøkelser og diamantboringer. Det er ikke påvist kromitt-mineraliseringer av økonomisk interessant størr- elsesorden, og det er heller ikke påvist eller utredet andre anvendelses- muligheter av økonomisk interesse for de ultramafiske bergarter som kromitt- forekomstene er tilknyttet. Rapporten gir resultater fra diamantboringene i feltet sommeren 1979. Rapporten er en oppsummering av de undersøkelser som er foretatt.

	Genesis:		Form:
	Main texture:		Min. distribution:

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

	Activity:		Reserves:
	Operating method:		Historical production:	33 thousand tons

	Element/product	Crude ore grade or quality	Reg. date
	Cr	26.7 %	18.03.2024

	Activity:	Mining	Reserves:
	Operating method:	Underground mining	Historical production:	32,55 thousand tons

Era:	Paleozoic	Period:
Genesis:	Orthomagmatic formation	Form:
Main texture:		Min. distribution:

	Relationship	Mineral	Amount
	Ore mineral	Chromite	Major mineral (>10%)

	Abstract:
	MMålingene foregikk i NGU's laboratorium og i alt 11 prøver ble undersøkt. De utførte målinger viser at malmprøvene stort sett har samme ledningsevne som den omgivende bergart. Det er derfor sannsynlig at indusert poarisasjon (IP-målinger) er den eneste elektriske prospekteringsmetode som det er grunn til å forsøke i Feragenfeltet.