Norsk versjon
	THE ORE DATABASE
	3316 - 016 Modum Vest
	(Object Id: 36911) (Last updated: 21.02.2019)

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Hokksund (1714-1)

Map 1:250000:

Skien

Coordinate system:

EU89-UTM Zone 32

East:

548320 m.

North:

6648149 m.

Longitude:

9.8654780

Latitude:

59.9678750

Show on map

Resource

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

Importance

Raw material meaning:

Not Assessed (reg. 09.02.2017)

Historical:

Yes , (Confirmed 16.feb.2005 by Havard Gautneb)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:	280 thousand tons

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 cobalt ores at Skuterud were found in 1772, and ordinary production started in 1776. First in large open pits, but from 1827 until the closure in 1898, mining was done underground. In the 1890s, ore reserves decreased rapidly, leading to the final shutdown of mining operation in 1898. On the basis of different old mining reports the total production is estimated to 1 Mt with 0.2 % Co. In addition to cobalt, the ores contain significant grades of copper (up to 1-2 %) and locally enrichment of gold (several ppm). The cobalt occurrences at Modum are related to sulphide-rich schist zones, so-called fahlbands. The most extensive sulphide-rich zone has a length of 12 km along strike, and is up to 100–200 m wide. The rock type hosting the sulphides may be characterized as a quartz-plagioclase-tourmaline-phlogopite-sulphide gneiss or schist. Graphite is locally common and its content may attain more than 5 % of the rock. The cobalt mineralisation is, to a large degree, characterised by impregnation of cobaltite (CoAsS), glaucodote ((Co,Fe)AsS), safflorite ((Co,Fe)As2) and skutterudite (CoAs3), which partly occur as enriched in quartz-rich zones and lenses. The cobalt-rich lenses are structurally controlled, following axes of folds and lineations in the area.

Bibliography:

From NGU's Reference Archive:

Grorud, Hans-Fredrik , 1997

	Textural and compositional characteristics of cobalt ores from the Skuterud Mines of Modum, Norway

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.77 (1);31-38 pages

Abstract:

The metasedimentary rocks of the Modum Complex contain concordant, sulphide- rich zones, commonly referred to as 'fahlbands'. Two of these fahlbands contain cobalt minerals. Petrographic and microprobe analyses of the cobalt minerals have been performed on selected samples, to gain insight into the genesis and post-mineralization history of the cobalt minerals. It is suggested that these minerals precipitated from an oxidizing fluid, and that certain minerals in the uraninite.thorianite series precipitated simulataneously. The fahlband silicates, and later the cobalt minerals, were recrystallized during Sveco- norwegian penetrative deformation and thermal maximum (-1.2- -0.9Ga). Prolonged heating during this event eradicated any compositional zoning which may originally have been present. Neither textural nor mineral chemical analyses indicate whether the observed cobalt minerals are the result of a primary precipitation, or of remobilization.

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Hokksund (1714-1)

Map 1:250000:

Skien

Coordinate system:

EU89-UTM Zone 32

East:

548248 m.

North:

6648836 m.

Longitude:

9.8643630

Latitude:

59.9740530

Show on map

Resource

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

Importance

Raw material meaning:

Not Assessed (reg. 20.05.2019)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:	574 thousand tons

Products

	Element/product	Crude ore grade or quality	Reg. date
	Co	0.2 %	31.08.2010

Operations

	From - To	Activity	Comments
	1773 - 1776	Test mining	Company/Institution :Blaafarveværket
	1776 - 1898	Regular production	Company/Institution :Blaafarveværket

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 cobalt ores at Skuterud were found in 1772, and ordinary production started in 1776. First in large open pits, but from 1827 until the closure in 1898, mining was done underground. In the 1890s, ore reserves decreased rapidly, leading to the final shutdown of mining operation in 1898. On the basis of different old mining reports the total production is estimated to 1 Mt with 0.2 % Co. In addition to cobalt, the ores contain significant grades of copper (up to 1-2 %) and locally enrichment of gold (several ppm). The cobalt occurrences at Modum are related to sulphide-rich schist zones, so-called fahlbands. The most extensive sulphide-rich zone has a length of 12 km along strike, and is up to 100–200 m wide. The rock type hosting the sulphides may be characterized as a quartz-plagioclase-tourmaline-phlogopite-sulphide gneiss or schist. Graphite is locally common and its content may attain more than 5 % of the rock. The cobalt mineralisation is, to a large degree, characterised by impregnation of cobaltite (CoAsS), glaucodote ((Co,Fe)AsS), safflorite ((Co,Fe)As2) and skutterudite (CoAs3), which partly occur as enriched in quartz-rich zones and lenses. The cobalt-rich lenses are structurally controlled, following axes of folds and lineations in the area.

Bibliography:

From NGU's Reference Archive:

Grorud, Hans-Fredrik , 1997

	Textural and compositional characteristics of cobalt ores from the Skuterud Mines of Modum, Norway

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.77 (1);31-38 pages

Abstract:

The metasedimentary rocks of the Modum Complex contain concordant, sulphide- rich zones, commonly referred to as 'fahlbands'. Two of these fahlbands contain cobalt minerals. Petrographic and microprobe analyses of the cobalt minerals have been performed on selected samples, to gain insight into the genesis and post-mineralization history of the cobalt minerals. It is suggested that these minerals precipitated from an oxidizing fluid, and that certain minerals in the uraninite.thorianite series precipitated simulataneously. The fahlband silicates, and later the cobalt minerals, were recrystallized during Sveco- norwegian penetrative deformation and thermal maximum (-1.2- -0.9Ga). Prolonged heating during this event eradicated any compositional zoning which may originally have been present. Neither textural nor mineral chemical analyses indicate whether the observed cobalt minerals are the result of a primary precipitation, or of remobilization.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	BU0096.01	Dump	Sampler: T. Bjerkgård/I. Henderson/...Stored: Løkken/...Size(kg): 3 Comment: Rich impregnation of chalcopyrite with lesser pyrrhotite, accessory cobalt minerals and molybdenite, in gedrite/anthophyllite rock with some quartz and biotite. No. of registrated element analyses = 1
	BU0096.02	Dump	Sampler: T. Bjerkgård/I. Henderson/...Stored: Løkken/...Size(kg): 3 Comment: Pyrrhotite-chalcopyrite impregnation in biotite-bearing quartz-sericite schist with porphyroblasts of sillimanite No. of registrated element analyses = 1
	BU0096.03	Bedrock	Sampler: T. Bjerkgård Comment: Co mineralisation in quartzitic rock, The Clara adit No. of registrated element analyses = 1
	BU0096.04	Bedrock	Sampler: T. Bjerkgård Comment: Co mineralization in chlorite-rich quartzitic rock No. of registrated element analyses = 1
	BU0096.05	Bedrock	Sampler: T. Bjerkgård Comment: Co mineralization in quartzitic rock (below open pit) No. of registrated element analyses = 1
	BU0096.06	Bedrock	Sampler: T. Bjerkgård Comment: Co mineralised chlorite-biotite schist No. of registrated element analyses = 1
	BU0096.07	Bedrock	Sampler: T. Bjerkgård Comment: Co mineralisation in dark chlorite-biotite schist (from location Hvalfisken) No. of registrated element analyses = 1
	BU0096.08	Bedrock	Sampler: T. Bjerkgård Comment: Co mineralised grey, spotty rock (location Hvalfisken) No. of registrated element analyses = 1
	CONSTANTIN-Ø	Bedrock	Sampler: T. Bjerkgård Comment: Coablt mineralised schist No. of registrated element analyses = 1
	HVALFISKEN 1	Bedrock	Sampler: T. Bjerkgård Comment: Cobalt-rich schist No. of registrated element analyses = 1
	HVALFISKEN 2	Bedrock	Sampler: T. Bjerkgård Comment: Cobalt-rich schist No. of registrated element analyses = 1
	SKUTERUD-MG1	Bedrock	Sampler: T. Bjerkgård Comment: Cobalt-rich schist No. of registrated element analyses = 1
	77419	Bedrock	Sampler: T. Bjerkgård Comment: Cobalt-mineralised schist No. of registrated element analyses = 1
	77421	Bedrock	Sampler: T. Bjerkgård Comment: Cobalt in schist No. of registrated element analyses = 1

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

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Hokksund (1714-1)

Map 1:250000:

Skien

Coordinate system:

EU89-UTM Zone 32

East:

548211 m.

North:

6649252 m.

Longitude:

9.8637970

Latitude:

59.9777870

Show on map

Resource

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

Importance

Raw material meaning:

Not Assessed (reg. 09.02.2017)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:	140 thousand tons

Products

	Element/product	Crude ore grade or quality	Reg. date
	Co	0.2 %	31.08.2010

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 cobalt ores at Skuterud were found in 1772, and ordinary production started in 1776. First in large open pits, but from 1827 until the closure in 1898, mining was done underground. In the 1890s, ore reserves decreased rapidly, leading to the final shutdown of mining operation in 1898. On the basis of different old mining reports the total production is estimated to 1 Mt with 0.2 % Co. In addition to cobalt, the ores contain significant grades of copper (up to 1-2 %) and locally enrichment of gold (several ppm). The cobalt occurrences at Modum are related to sulphide-rich schist zones, so-called fahlbands. The most extensive sulphide-rich zone has a length of 12 km along strike, and is up to 100–200 m wide. The rock type hosting the sulphides may be characterized as a quartz-plagioclase-tourmaline-phlogopite-sulphide gneiss or schist. Graphite is locally common and its content may attain more than 5 % of the rock. The cobalt mineralisation is, to a large degree, characterised by impregnation of cobaltite (CoAsS), glaucodote ((Co,Fe)AsS), safflorite ((Co,Fe)As2) and skutterudite (CoAs3), which partly occur as enriched in quartz-rich zones and lenses. The cobalt-rich lenses are structurally controlled, following axes of folds and lineations in the area.

Photo(s) from the Deposit area:

Photo no. 1 showing Nordgruvene" Photo no. 2 showing Erythrin"

Bibliography:

From NGU's Reference Archive:

Grorud, Hans-Fredrik , 1997

	Textural and compositional characteristics of cobalt ores from the Skuterud Mines of Modum, Norway

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.77 (1);31-38 pages

Abstract:

The metasedimentary rocks of the Modum Complex contain concordant, sulphide- rich zones, commonly referred to as 'fahlbands'. Two of these fahlbands contain cobalt minerals. Petrographic and microprobe analyses of the cobalt minerals have been performed on selected samples, to gain insight into the genesis and post-mineralization history of the cobalt minerals. It is suggested that these minerals precipitated from an oxidizing fluid, and that certain minerals in the uraninite.thorianite series precipitated simulataneously. The fahlband silicates, and later the cobalt minerals, were recrystallized during Sveco- norwegian penetrative deformation and thermal maximum (-1.2- -0.9Ga). Prolonged heating during this event eradicated any compositional zoning which may originally have been present. Neither textural nor mineral chemical analyses indicate whether the observed cobalt minerals are the result of a primary precipitation, or of remobilization.

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Hokksund (1714-1)

Map 1:250000:

Skien

Coordinate system:

EU89-UTM Zone 32

East:

548231 m.

North:

6650268 m.

Longitude:

9.8643790

Latitude:

59.9869100

Show on map

Resource

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

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	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

Såstad gruver ligger ca. 1 km nord for Skuterud Nordgruver (BU 0097) og kan lettest nås ved å gå den gamle gruveveien fra Skuterudgruvene. Gruvene består hovedsaklig av to langstrakte skjæringer/strosser i nord-sør retning, samt en stoll inn fra øst. Den nordligste skjæringen har en lengde på 110 m og når en dybde på minst 10 meter ned til vannspeilet. Den sørligste slkjæringen er ca. 90 m lang. Her er de sørligste 20 m grunne (ned til 2 m), mens dybden er minst 10 m mot nord. Her kan en se rester av en fyrsatt stoll nede ved vannspeilet. Det går inn en stoll nede i lia øst for og 50-55 m lenger ned i terrenget enn skjæringene. Stollen går rett vestover (275 grader) i ca. 70 meters lengde og er uten tverrslag. Stollen er fyrsatt. Den synes å være for kort til å nå inn under mineraliseringen i skjæringene. Innerst i stollen er det rusten kvartsrik gneis i 2 m mektighet.Målinger med bærbar XRF på gneisen viste spor av kobber og kobolt (opptil henholdsvis 0.21 og 0.09%). Mineralisering som finnes på tipphaugene består av vesentlig magnetkis og noe kobberkis i kvarts, dels i form av sliret impregnasjon og dels i spredte korn. Sammen med kvartsen opptrer noe kloritt, muskovitt, flogopitt og amfibol.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	BU0098.01	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Spredt kobberkis, magnetkis og koboltmineraler(?) i muskovitt-biotittholdig kvartsitt. No. of registrated element analyses = 1
	BU0098.02	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Spredte aggregater av kobberkis og magnetkis i kvarts. Noe muskovitt og flogopitt, samt amfibolnåler. No. of registrated element analyses = 1
	BU0098.03	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Rik, sliret impregnasjon av kobberkis og magnetkis i kvarts. Amfibolnåler. No. of registrated element analyses = 1
	77422	Dump	Sampler: T. Bjerkgård Comment: Cobalt mineralised schist No. of registrated element analyses = 1

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

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Coordinate system:

EU89-UTM Zone 32

East:

546643 m.

North:

6653482 m.

Longitude:

9.8366560

Latitude:

60.0159460

Show on map

Resource

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

Importance

Raw material meaning:

Not Assessed (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:

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Coordinate system:

EU89-UTM Zone 32

East:

545809 m.

North:

6655030 m.

Longitude:

9.8220530

Latitude:

60.0299380

Show on map

Resource

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

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:

Mineralization

	Era:	Proterozoic	Period:	Mesoproterozoic
	Genesis:	Unknown	Form:
	Main texture:		Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

Silicification

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

	Province:	South Norwegian Basement Province
	Geotec.unit:	Kongsberg Complex
	Tectonic complex:	Modum Complex
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Biotite	Subordinate mineral (1-10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Quartzite	Sedimentary Original rock :Quartz sandstone
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :10 / 65	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Døvikkollen koboltgruve ligger like nord for toppen av kollen. Gruva består av en skjæring/dagstrosse ca. 50 m lang, inntil 5-6 m bred og minst 10 m dyp. Strossa er orientert NNV-SSØ med en bøy mot NNØ i den nordligste tredjedel. Det meste av strossa er vannfylt, men ikke i den sørligste delen. Det er en anseelig gråbergstipp nord for strossa som inneholder anslagsvis 1700 kbm materiale. Det er også to skeidehauger 50-100 m nord for gruva. Mineralisering består overveiende av magnetkis i kvarts. Det er aksessorisk til underordnet kobberkis. Koboltmineraler er vanskelig å finne. Sulfidene opptrer som slirer elller svak impregnasjon i kvarts som dels er svakt båndet. det er også noe biotitt.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	BU0101.01	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Uregelmessig sliret magnetkisimpregnasjon med underordnet kobberkis i kvarts. No. of registrated element analyses = 1
	BU0101.02	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Uregelmessig sliret magnetkisimpregnasjon med underordnet kobberkis i kvarts. No. of registrated element analyses = 1
	BU0101.03	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Båndet, forholdsvis rik impregnasjon av magnetkis i kvarts-biotittskifer. Aksessorisk kobberkis. No. of registrated element analyses = 1
	BU0101.04	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Samleprøve med magnetkis og aksessorisk kobberkis, koboltglans, vesentlig i kvarts. No. of registrated element analyses = 1
	BU0101.05	Dump	Sampler: T. Bjerkgård, J.S. Sandstad Comment: Arsenopyrite mineralization as stripes in quartzitic rock No. of registrated element analyses = 1
	BU0101.06	Dump	Sampler: T. Bjerkgård, J.S. Sandstad Comment: Quartz-rich rock with arsenopyrite, cobalt minerals, pyrrhotite and chalcopyrite No. of registrated element analyses = 1

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

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Coordinate system:

EU89-UTM Zone 32

East:

545900 m.

North:

6657600 m.

Longitude:

9.8242430

Latitude:

60.0530020

Show on map

Resource

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

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	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

Gruva består av en grunnstoll som går inn mot sør i eliten ås/kolle. Det er en 6-7 m lang dagskjæring som leder mot inngangen. Stollen er fyrsatt. 10 m mot øst er det en dagåpning som går parallelt med den som leder inn i stollen. Den er også 6-7 m lang og 6-7 m dyp. Sentralt i skjæringen/stolltaket ved åpningen er en finkornet kvartsitt med enkelte sulfidkorn. Den har en mektighet på c. 2 meter. Sidebergarten til denne er en muskovitt-biotitt gneiss. I følge stuffer på den i stor grad overvokste tipphaugen er mineralisering tilknyttet kvartsitt og muskovitt-biotittskifer og består av magnetkis, litt pyritt og kobberkis i fattig impregnasjon. Koboltfaser er ikke observert.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	BU0102.01	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Båndet muskovitt- og biotittholdig kvartsitt med spredt magnetkis og kobberkis. No. of registrated element analyses = 1
	BU0102.02	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Uregelmessige aggregater av kobberkis, pyritt og magnetkis i kloritt-biotitt-kvartsskifer. No. of registrated element analyses = 1
	BU0102.03	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Båndet biotitt-muskovittholdig kvartsitt med spredt kobberkis og magnetkis. No. of registrated element analyses = 1
	BU0102.04	Dump	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Grafittrik muskovitt-biotittskifer med spredt kobberkis, pyritt og magnetkis. Gjennomsatt av seinere kvartsårer. No. of registrated element analyses = 1

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

Location

County:

Buskerud

Municipality:

Modum (3316)

Map 1:50000:

Krøderen (1715-2)

Map 1:250000:

Hamar

Coordinate system:

EU89-UTM Zone 32

East:

545930 m.

North:

6656570 m.

Longitude:

9.8245510

Latitude:

60.0437510

Show on map

Resource

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

Importance

Raw material meaning:

Not Assessed (reg. 18.02.2015)

Historical:

Yes , (Confirmed 19.sep.2001 by Terje Bjerkgård)

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:

Mineralization

	Era:	Proterozoic	Period:	Mesoproterozoic
	Genesis:	Unknown	Form:	Lens
	Main texture:	Structureless	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

	Strike/Dip:	182 / 85	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

	Province:	South Norwegian Basement Province
	Geotec.unit:	Kongsberg Complex
	Tectonic complex:	Modum Complex
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Amphibole	Major mineral (>10%)
	Gangue mineral	Biotite	Major mineral (>10%)
	Gangue mineral	Feldspar	Major mineral (>10%)
	Ore mineral	Cobaltite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Quartzite	Sedimentary Original rock :Quartz sandstone
			Metamorphic facies :Amphibolite
	Host rock	Quartz-mica schist	Sedimentary Original rock :Siltstone
			Metamorphic facies :Amphibolite
	Host rock	Amphibolite	Intrusive Original rock :Dolerite
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :185 / 85	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Den gamle gruveveien kan følges opp fra Elistua ved Snarumselva opp til Svartfjell koboltgruve som ligger på toppen av åsen Svartfjellet. Det er her drevet to dype skjæringer over en total lengde på ca. 220 m i nord-nør retning. Den nordlige skjæringen er ca. 120 m lang, mens den sørlige er ca. 90 m lang. Det er 7-8 m langt parti mellom skjæringene hvor det ikke er drevet. Den sørligste skjæringen er den dypeste og er minst 50 m dyp i en strosse i øst. Dette er verifisert ved at en stoll går inn i skjæringen på 50 meters dyp. Den er drevet inn 125 m mot SØ og minst 50 m lenger ned en dagoverflaten ved sørenden av skjæringen. Det går også en stoll inn fra nord inn i den nordlige skjæringen. Den går inn 30 m under dagoverflaten ved nordenden av denne skjæringen. Begge disse stollene er fyrsatte. Co-Cu-As mineraliseringene finnes disseminert og i tynne striper i glimmerførende, kvartsittisk bergart og i amfibolitt, som dels er albittisert. Den mineraliserte sonen er 1-2 m bred. I nordenden av den sørlige skjæringen opptrer en gjennomskjærende pegmatittiske ganger som også fører noe molybdenglans.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	BU0103.01	Bedrock	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Weak pyrite impregnation in silicified wall rock. Frequent mm-sized amphibole needles. No. of registrated element analyses = 1
	BU0103.02	Dump	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Weak impregnation of cobalt minerals in quartz and seritic quartz schist. Collection of small dump samples. No. of registrated element analyses = 1
	BU0103.03	Dump	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Rich pyrite impregnation with minor chalcopyrite in amphibole-chlorite schist. No. of registrated element analyses = 1
	BU0103.04	Dump	Sampler: T. Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Weak pyrrhotite-chalcopyrite impregnation in quartz-sericite schist. No. of registrated element analyses = 1
	BU0103.05	Dump	Sampler: J.S. Sandstad Comment: Biotite-bearing quartz-pegmatite with diss. arsenopyrite, chalcopyrite and molybdenite No. of registrated element analyses = 1
	BU0103.06	Dump	Sampler: J.S. Sandstad Comment: Co-apy-cpy mineralised amphibolite No. of registrated element analyses = 1
	BU0103.07	Dump	Sampler: J.S Sandstad Comment: cpy-apy-Co diss. in laminated quartzitic rock No. of registrated element analyses = 1
	JSA_55	Bedrock	Sampler: J.S. Sandstad Comment: Ore quartzite, py-po diss in fine grained grey quartzite and Co-As-Cu min in amphibol rich band 1cm No. of registrated element analyses = 1
	64941	Bedrock	Sampler: T. Bjerkgård Comment: Co-As-Cu mineralised rock No. of registrated element analyses = 1

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

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The fact sheet was created on 26.04.2024

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

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