Fact Sheet for <b>Occurence 5025 - 044 Bersvensåsen</b>

					Norsk versjon
	THE ORE DATABASE
	Occurence 5025 - 044 Bersvensåsen
	(Object Id: 4376) (Last updated: 27.10.2023)

Location

County:

Trøndelag

Municipality:

Rosse (5025)

Map 1:50000:

Røros (1720-3)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

622788 m.

North:

6942506 m.

Longitude:

11.3912900

Latitude:

62.5928920

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Resource

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

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

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

Products

Element/product Crude ore grade or quality Reg. date

Cu 12.01.1998

Operations

From - To Activity Comments

Test mining Company/Institution :Røros Kobberverk

1997 - 1997 Sampling Company/Institution :NGU

Mineralization

Era: Paleozoic Period: Ordovician

Genesis: Hydrothermal vein Form: Irregular

Main texture: Structureless Min. distribution: Irregular (scattered)

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

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Ordovician

Province: Caledonides

Geotec.unit: Røros Nappe Complex

Tectonic complex:

Igneous complex:

Group: Aursund Group Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Chlorite Major mineral (>10%)

Gangue mineral Carbonate Subordinate mineral (1-10%)

Ore mineral Chalcopyrite Major mineral (>10%)

Ore mineral Sphalerite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Wall rock Calc.chlorite-biotite sch. Sedimentary
Original rock :Greywacke

Metamorphic facies :Greenschist

Structures

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

Wall rock Foliation Strike/Dip :186 / 38 Post-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Bersvensåsen, også kalt Isakgruva, ligger på snaufjellet 2 km rett nord for Røros sentrum. Feltet består av en rekke mindre røsker, skjæringer og grunne synker spredt utover et ca. 100 x 250 m stort område. Den største vannfylte synken er 4 x 4 m i diameter og tippen inneholder ca. 150m3 materiale. Mineraliseringen i gruva består av uregelmessige slirer, årer og svake impregnasjoner av kobberkis med mindre mengder sinkblende og magnetkis i klorittskifer med kvarts-karbonatlinser. Sidebergarten er kloritt-biotittskifer, dels muskovitt og karbonatholdig.

Bibliography:

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

Johan Braastad 1920: Beskrivelse av Rørosgruberne. 56 pp. Norges Geologisk Undersøkelse 1920.

Fieldsamples

Sample No. Sample type Miscellanrous

ST0173.08 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Rich impregnation of chalcopyrite in lenses parallel foliation in chlorite schist. A few layers contains sphalerite. Frequent carbonate and quartz lenses.

No. of registrated element analyses = 1

400037 Dump

Sampler: MINDEX ASA

No. of registrated element analyses = 1

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

Name of Locality: Bersvensåsen I

(Object Id: 10074 44,01,00)

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Røros (1720-3) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 622753 m. North: 6942680 m.

Longitude: 11.3907420 Latitude: 62.5944610

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Resource

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

Element(s): Kis Cu

Resources and production

Activity: Pitting Reserves:

Operating method: Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Cu 12.01.1998

Operations

From - To Activity Comments

Pitting Company/Institution :Røros Kobberverk

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Chlorite Major mineral (>10%)

Gangue mineral Muscovite Subordinate mineral (1-10%)

Ore mineral Chalcopyrite Major mineral (>10%)

Ore mineral Sphalerite Subordinate mineral (1-10%)

Ore mineral Pyrrhotite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Wall rock Chlorite-biotite schist Sedimentary
Original rock :Greywacke

Metamorphic facies :Greenschist

Structures

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

Wall rock Foliation Strike/Dip :202 / 59 Post-mineralisation ;...Effect :Controls

Wall rock Fold axis Dir./Plunge :249 / 45 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Røsk 4 x 2 i omriss og 1.5 m dyp. Mineralisering består dels av svak, finkornet impregnasjon av kobberkis og noe sinkblende i kloritt-glimmerkifer (prøve ST0173.02) og dels av større ansamlinger av kobberkis, sinkblende og magnetkis i linser av kvarts og kalkspat (Prøve ST0173.01).

Fieldsamples

Sample No. Sample type Miscellanrous

ST0173.01 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Irregular aggregates of chalcopyrite and sphalerite in quartz and lesser carbonate.

No. of registrated element analyses = 1

ST0173.02 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Chlorite-mica schist with weak, fine-grained impregnation of chalcopyrite, sphalerite and pyrrhotite.

No. of registrated element analyses = 1

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

Name of Locality: Bersvensåsen II

(Object Id: 10075 44,02,00)

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Røros (1720-3) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 622814 m. North: 6942678 m.

Longitude: 11.3919280 Latitude: 62.5944230

Show on map

Resource

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

Element(s): Kis Cu

Resources and production

Activity: Pitting Reserves:

Operating method: Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Cu 12.01.1998

Operations

From - To Activity Comments

Pitting Company/Institution :Røros Kobberverk

Mineralogy

Relationship Mineral Amount

Gangue mineral Chlorite Major mineral (>10%)

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Muscovite Subordinate mineral (1-10%)

Gangue mineral Carbonate Subordinate mineral (1-10%)

Ore mineral Chalcopyrite Major mineral (>10%)

Ore mineral Pyrrhotite Subordinate mineral (1-10%)

Ore mineral Sphalerite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Wall rock Calc. chlorite-biotite schist Sedimentary
Original rock :Greywacke

Metamorphic facies :Greenschist

Structures

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

Wall rock Foliation Strike/Dip :175 / 52 Post-mineralisation ;...Effect :Controls

Wall rock Mineral lineation Dir./Plunge :270 / 51 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Røsk 3 x 4 m i omriss og 2 m dyp helt på toppen av åsen, ca. 60 m øst for Bersvensåsen I. Tipphaug inneholder ca. 15-20 m3 materiale. Mineralisering som i Bersvensåsen I med dels svak impregnasjon av kobberkis i klorittrik skifer og dels som uregelmessige aggregater relatert til kvarts-linser. Mindre karbonat og færre kvartsårer enn i Bersvensåsen I Skiferen viser en gjennomgående krenulasjon/lineasjon og fører også til elongasjon av kvartslinsene (trend/plunge 270/51). To små røsker henholdsvis 20 og 35 m i sørvestlig retning.

Fieldsamples

Sample No. Sample type Miscellanrous

ST0173.03 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Aggregates of chalcopyrite in quartz lenses in chlorite schist.

No. of registrated element analyses = 1

ST0173.04 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Muscovite-chlorite schist with weak impregnation of chalcopyrite as foliation-parallel 1-2 mm streaks.

No. of registrated element analyses = 1

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

Name of Locality: Bersvensåsen III

(Object Id: 10076 44,03,00)

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Røros (1720-3) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 622713 m. North: 6942622 m.

Longitude: 11.3899200 Latitude: 62.5939520

Show on map

Resource

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

Element(s): Kis Cu

Resources and production

Activity: Pitting Reserves:

Operating method: Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Cu 12.01.1998

Operations

From - To Activity Comments

Pitting Company/Institution :Røros Kobberverk

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Chlorite Major mineral (>10%)

Gangue mineral Carbonate Subordinate mineral (1-10%)

Ore mineral Chalcopyrite Major mineral (>10%)

Ore mineral Sphalerite Subordinate mineral (1-10%)

Ore mineral Magnetite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Wall rock calc.chlorite-mica schist Sedimentary
Original rock :Greywacke

Metamorphic facies :Greenschist

Structures

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

Wall rock Foliation Strike/Dip :192 / 33 Post-mineralisation ;...Effect :Controls

Wall rock Fold axis Dir./Plunge :239 / 39 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Skjerpet består av en røsk/skjæring ca. 10 m lang i vest-øst retning og 1-1.5 m dyp i glimmerskifer. Tipphaugen inneholder ca. 60m3 materiale. I skjæringen opptrer en uregelmessig 60-70 cm mektig kvartsåre med slirer av kloritt, grovkornet Fe-rik kalsitt og spredte aggregater med kobberkis. Strukturelt under åren opptrer muskovitt-klorittskifer med streker av finkornet kobberkis og årer av karbonat (Prøve ST0173.05). Ellers opptrer spredte, euhedrale og meget finkornede (< 1mm) oktahedre av magnetitt.

Fieldsamples

Sample No. Sample type Miscellanrous

ST0173.05 Bedrock

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Chalcopyrite impregated as thin foliation-parallel streaks in muscovite-chlorite schist.

No. of registrated element analyses = 1

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

Name of Locality: Bersvensåsen IV

(Object Id: 10077 44,04,00)

Location

County: Trøndelag Municipality: Rosse (5025)

Map 1:50000: Røros (1720-3) Map 1:250000: Røros

Coordinate system: EU89-UTM Zone 32

East: 622752 m. North: 6942577 m.

Longitude: 11.3906520 Latitude: 62.5935400

Show on map

Resource

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

Element(s): Kis Cu

Resources and production

Activity: Test mining Reserves:

Operating method: Underground mining Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Cu 12.01.1998

Operations

From - To Activity Comments

Test mining Company/Institution :Røros Kobberverk

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Chlorite Major mineral (>10%)

Gangue mineral Carbonate Subordinate mineral (1-10%)

Gangue mineral Biotite Subordinate mineral (1-10%)

Gangue mineral Muscovite Accessory mineral (<1%)

Ore mineral Sphalerite Major mineral (>10%)

Ore mineral Chalcopyrite Major mineral (>10%)

Lithology:

Relationship Rock Origin

Wall rock Chlorite-mica schist Sedimentary
Original rock :Greywacke

Metamorphic facies :Greenschist

Structures

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

Wall rock Foliation Strike/Dip :183 / 48 Post-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Skjerpet som ligger ca. 40 m SØ for no. III, består av en vannfylt synk, 6 x 2.5 m i omriss. Tippen inneholder ca. 35 m3 materiale. Mineralisering består dels av finkornet,svak kobberkis- sinkblende impregnasjon i biotitt-rik klorittskifer og dels av aggregater av kobberkis relatert til kvartslinser med noe karbonat.

Fieldsamples

Sample No. Sample type Miscellanrous

ST0173.06 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Irregular lenses of chalcopyrite in quartz, surrounded by chlorite.

No. of registrated element analyses = 1

ST0173.07 Dump

Sampler: Terje Bjerkgård/Leif Furuhaug/...Stored: Løkken/...Size(kg): 2

Comment: Biotite-chlorite schist with fine-grained foliation-parallel streaks of chalcopyrite and sphalerite.

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5025 - 044 Bersvensåsen

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#

ST0173.01 Dump 3078 5496 7 10 23 .7 3.0

ST0173.02 Dump 2618 10082 -3 25 74 .6 7.0

ST0173.03 Dump 7071 1201 1044 22 45 6.2 52.0

ST0173.04 Dump 8618 2275 994 37 35 6.2 134.0

ST0173.05 Bedrock 14499 835 -3 18 42 2.0 64.0

ST0173.06 Dump 4059 1449 4 8 16 .9 5.0

ST0173.07 Dump 15249 28336 -3 40 52 1.5 44.0

ST0173.08 Dump 21645 10904 6 63 42 6.8 72.0

400037 Dump 4527 427 178 24 34 .8 100.0

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

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

ST0173.01 1.0 -1.0 2 13.9 129 -1.00 3 -3 .35

ST0173.02 -1.0 2.0 7 25.7 437 -1.00 -3 10 .67

ST0173.03 2.0 -1.0 4 5.6 187 2.00 -3 32 1.06

ST0173.04 -1.0 -1.0 7 16.4 104 -1.00 -3 21 1.34

ST0173.05 -1.0 2.0 8 3.1 83 -1.00 -3 26 1.62

ST0173.06 -1.0 2.0 3 3.7 108 2.00 -3 6 .44

ST0173.07 2.0 1.0 5 67.6 60 4.00 -3 34 3.11

ST0173.08 -1.0 -1.0 10 24.1 54 1.00 3 57 2.61

400037 7 2.1 61 3.00 3 3

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

Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*

ST0173.01 17 25 802 2.22 -2.00 -8.00 -2 44.0 2.00

ST0173.02 55 97 1360 5.18 3.00 -8.00 -2 26.0 5.00

ST0173.03 69 99 984 7.08 7.00 -8.00 -2 11.0 18.00

ST0173.04 100 114 1564 8.93 7.00 -8.00 1 9.0 13.00

ST0173.05 55 120 1452 8.03 5.00 -8.00 -2 12.0 6.00

ST0173.06 14 33 688 2.44 -2.00 -8.00 8 24.0 3.00

ST0173.07 69 134 1776 8.91 3.00 -8.00 2 11.0 6.00

ST0173.08 120 149 2783 13.22 9.00 -8.00 -2 10.0 16.00

400037 40 215 750 5.40 24.0 5.00

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

Sample No. B* Ti*

ST0173.01 -3

ST0173.02 -3

ST0173.03 4

ST0173.04 7

ST0173.05 4

ST0173.06 -3

ST0173.07 -3

ST0173.08 -3

400037 480

	Element/product	Crude ore grade or quality	Reg. date
	Cu		12.01.1998

From - To	Activity	Comments
	Test mining	Company/Institution :Røros Kobberverk
1997 - 1997	Sampling	Company/Institution :NGU

Era:	Paleozoic	Period:	Ordovician
Genesis:	Hydrothermal vein	Form:	Irregular
Main texture:	Structureless	Min. distribution:	Irregular (scattered)

	Province:	Caledonides
	Geotec.unit:	Røros Nappe Complex
	Tectonic complex:
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Quartz	Major mineral (>10%)
Gangue mineral	Chlorite	Major mineral (>10%)
Gangue mineral	Carbonate	Subordinate mineral (1-10%)
Ore mineral	Chalcopyrite	Major mineral (>10%)
Ore mineral	Sphalerite	Subordinate mineral (1-10%)

Relationship	Rock	Origin
Wall rock	Calc.chlorite-biotite sch.	Sedimentary Original rock :Greywacke
		Metamorphic facies :Greenschist

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :186 / 38	Post-mineralisation ;...Effect :Controls

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
ST0173.01	Dump	3078	5496	7	10	23	.7	3.0
ST0173.02	Dump	2618	10082	-3	25	74	.6	7.0
ST0173.03	Dump	7071	1201	1044	22	45	6.2	52.0
ST0173.04	Dump	8618	2275	994	37	35	6.2	134.0
ST0173.05	Bedrock	14499	835	-3	18	42	2.0	64.0
ST0173.06	Dump	4059	1449	4	8	16	.9	5.0
ST0173.07	Dump	15249	28336	-3	40	52	1.5	44.0
ST0173.08	Dump	21645	10904	6	63	42	6.8	72.0
400037	Dump	4527	427	178	24	34	.8	100.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
ST0173.01	1.0	-1.0	2	13.9	129	-1.00	3	-3	.35
ST0173.02	-1.0	2.0	7	25.7	437	-1.00	-3	10	.67
ST0173.03	2.0	-1.0	4	5.6	187	2.00	-3	32	1.06
ST0173.04	-1.0	-1.0	7	16.4	104	-1.00	-3	21	1.34
ST0173.05	-1.0	2.0	8	3.1	83	-1.00	-3	26	1.62
ST0173.06	-1.0	2.0	3	3.7	108	2.00	-3	6	.44
ST0173.07	2.0	1.0	5	67.6	60	4.00	-3	34	3.11
ST0173.08	-1.0	-1.0	10	24.1	54	1.00	3	57	2.61
400037			7	2.1	61	3.00	3	3

Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
ST0173.01	17	25	802	2.22	-2.00	-8.00	-2	44.0	2.00
ST0173.02	55	97	1360	5.18	3.00	-8.00	-2	26.0	5.00
ST0173.03	69	99	984	7.08	7.00	-8.00	-2	11.0	18.00
ST0173.04	100	114	1564	8.93	7.00	-8.00	1	9.0	13.00
ST0173.05	55	120	1452	8.03	5.00	-8.00	-2	12.0	6.00
ST0173.06	14	33	688	2.44	-2.00	-8.00	8	24.0	3.00
ST0173.07	69	134	1776	8.91	3.00	-8.00	2	11.0	6.00
ST0173.08	120	149	2783	13.22	9.00	-8.00	-2	10.0	16.00
400037	40	215	750	5.40				24.0	5.00