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	THE ???? DATABASE
	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 22.03.2024)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Cu	3.5 %	30.09.1998
	S	41 %	30.09.1998

Operations

	From - To	Activity	Comments
	1882 - 1884	Regular production	Company/Institution :Trondhjem-Os Graphit & Metal A/B
	1889 - 1891	Regular production	Company/Institution :Os-Hommelvik kobberverk
	1890 - 1890	Core drilling	Company/Institution :Os-Hommelvik kobberverk
	1916 - 1918	Regular production	Company/Institution :Niels Juul & Co., Oslo
	1950 - 1950	Geophysics	Company/Institution :Geofysisk Malmleting, Trondheim
	1984 - 1984	Core drilling	Company/Institution :Folldal Verk AS
	1998 - 1998	Sampling	Company/Institution :NGU mineralressurser

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Genesis:	Volcex	Form:	Plate
	Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

Chloritisation

	Strike/Dip:	60 / 49	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	Subordinate mineral (1-10%)
	Gangue mineral	Carbonate	Subordinate mineral (1-10%)
	Gangue mineral	Sericite	Subordinate mineral (1-10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Sphalerite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Biotite-chlorite schist	Extrusive Original rock :Basalt
			Metamorphic facies :Greenschist
	Host rock	Serpentinite	Intrusive Original rock :Dunite
			Metamorphic facies :Greenschist
	Host rock	Metagabbro	Intrusive Original rock :Gabbro
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :60 / 49
	Host rock	Fold axis	Dir./Plunge :256 / 18
	Host rock	Fold axis	Dir./Plunge :295 / 43

Information(s) in free text format

Free text

Oscar II mine is situated to the south of Vangrøftdalen at the top of a hill south of Brufoss power station. It is easy accessible by a tractor road. History: The deposit was first claimed in 1882 and was closed down in 1918 after production of 9600 t of ore containing 3.5 % Cu and 41 % S. The mine was worked by two shafts, Kongen to the north and Victoria to the south and about 100 m apart. The Kongen shaft is the deepest, going to a depth of about 70 meters, whereas the Victoria shaft is about 30 m deep. Along strike the ore has been followed for about 150 meters, of which 90 meters could be mined. In addition to the two shafts, there is trench along strike between the shafts, about 40 m in length and 3 m deep. Today the shafts have been filled and nothing to be seen. Description: The trench follows the ore zone and ore is partly outcropping along it. An adit which is covered is seen in the southern end of the trench. An other trench goes across strike in the southern end of the first trench towards NW. The ore zone has strike 60 degr. and dips 49 degr. towards east. Massive to semi-massive finegrained pyrite ore is seen in several places along the trenches, occurring in 1-20 cm thick layers/bands parallel the schistosity in the surrounding chlorite-sericite schist (samples HE0086.03, and 04). Above the covered adit three bands of massive, fine grained pyrite ore occur. From the hanging wall side these are 1-2 cm, 3 cm and 20 cm thick, respectively. The latter show mm- to cm-scale lamination because of variation in content and grain size of pyrite and chlorite bands. These ore layers occur in chlorite-sericite schist and sericite schist. Massive ore found in the hanging wall of the trench in the northern end, consists of semi-massive pyrite with some chalcopyrite in quartz gangue. The layer is about 10 cm thick and occur in chlorite schist (sample HE0086.01). The trench across strike provides a good intersection of the alteration related to the ore. NW in this trench, the rock is biotite-chlorite schist with frequent mm-sized feldspar «eyes», probably a metabasalt. This grades towards the SE into sericitic chlorite schist and chlorite schist. The chlorite schist contain sparse pyrite cubes and small streaks and lenses of chalcopyrite, typically associated with quartz (sample 0086.06). Towards the ore zone the content of sericite increases and especially the 2 meters in the immediate hanging wall is highly enriched in sericite and extremely schistose. It contains sparse, fine grained pyrite. Footwall of the ore zone consists of alternating chlorite and sericite rich schists. Massive ore found in blocks is somewhat different from the ore seen in the trenches. Some blocks consist of massive fine grained chalcopyrite with lesser amounts of pyrite and pyrrhotite (sample HE0086.02), whereas others consist of banded pyrite ore with thin bands enriched in chalcopyrite or/and sphalerite (sample HE0086.05). The gangue is overall consisting of quartz and lesser amounts of chlorite or/and sericite. The deposit is hosted by metabasalt. About 300 m to the southwest of the deposit, there are several trenches in serpentinite and even pyroxenite. Metagabbro outcrops at the top of the hill 1 km to the southwest of the deposit.

Bibliography:

From NGU's Reference Archive:

Egeberg, F. , 1941

	Gruver og skjerp ved Os i Østerdalen.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 295;17 pages

Abstract:

Rapporten handler hovedsaklig om Fossgruven, men Fredrik IV, Oscar II og Vingelen gruve omtales også. Fossgruvens geologi, selve gruven og anlegget er beskrevet. Rapporten inneholder planer for drift av Fossgruven, anleggskalkyle, driftskalkyle m.m. Konklusjon: Fossgruven er en liten forekomst med lang transportvei. Det eksisterende veinett tillater ikke tungtransport. Transport og kraftspørsmålet må løses ved å finne muligheter for felles drift av flere gruver. Distriktet har flere gruver og skjerp med gode muligheter. Distriktet må derfor undersøkes malmgeologisk. Resultatet herav kan føre til forslag om geofysiske målinger og derav følgende diamantboringer. Utgifter til rene orienterende arbeider i denne retning er anslagsvis antatt å måtte bli kr. 100 000,-. Forekomstnr.: 10982, 10985, 11017, 11018.

Færden, Johannes , 1950

	Foreløpig rapport fra Os gruvefelt, Oscar II gruve, Fredrik IV gruve og Foss gruve.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1290;4 pages

Abstract:

Oscar II gruve. Det er tidligere drevet ut ca. 9 500 tonn kis med 41% S og 3,5% Cu i gjennomsnitt. Malmen har mektighet under 1,5 m. og skal være oppfart i 150 m. lengde, hvorav 90 m. er drivverdig. Det har uten resultat vært boret etter paralellmalmer i gruvens vestre del. Forekomsten ligger i glimmerskifer fra Rørosgruppen. Strøket er N 40 grader Ø, fallet er 40 grader mot NV. Foldningsaksen er målt Ø 65 grader S, fall 55 grader mot NV. Det er sannsynlig at malmen har en dragning i felt i nordlig retning. Fredrik IV gruve. Forekomsten ligger i amfibolittisk grønnskifer. Strøket er N 20 - 25 grader Ø, fallet 80 grader mot V. Det er sannsynlig at malmen er av stokkformig type. Malmen skal ha vert ganske kobberrik. Fossgruven. Det er tidligere drevet ut ca. 17 000 tonn eksportmalm med 46% S og 1,3% Cu i gjennomsnitt. Malmen er linjalformet og ligger steilt. Gjennomsnittsmektigheten er ca. 1,75 m., maksimal mektighet er 5 m. og feltutstrekningen er 40 - 60 m. Diamantboring i gruven har påvist malm i 170 m. nivå med mektighet 1,8 m., og en rekke magnetkisbånd. Forekomstnr.: 11017 og 11018. Forekomstenes navn og koordinater: Fredrik IV 32 6045 69343, Foss 6009 69387 og Oscar 6095 69316.

Sakshaug, G.F.; Brækken, H. , 1951

	Geofysisk undersøkelse østre Trondheimsfelt. Rapport over elektromagnetisk undersøkelse: Oscar II grube, omliggende områder, Os i Østerdalen

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.83;26 pages

Abstract:

Oscar II Grube ligger i glimmerskifer tilhørende Rørosgruppen. Malmsonen skal være oppfart i 150 meter lengde. Malmens mektighet er liten (1,5 m) og Kobberinnholdet ca. 3,5 %. Det er drevet ned flere synker på malmsonen. Ved foreliggende undersøkelse var det stilt som oppgave å fastlegge utstrekningen av grubens malmsone. Videre skulle det undersøkes om det i områdene omkring gruben skulle finnes hittil ukjente malmforekomster. Det ble utført 500 per. el.magn.kond. målinger (Turam). Arealet av det undersøkte område er ca. 9 km2. Ved målingene ble det påvist et meget stort antall soner av vekslende led- ningsevne og utstrekning. Det er nærliggende å anta at den overveiende del av sonene er grafittførende. I selve grubeområdet ble det påvist 3 relativt korte og svakt ledende soner. Den lengste (ca.100m) korresponderer trolig med den kjente malmsone. En må derfor foreløpig regne med at noen av de tilsvar- ende svakt ledende soner andre steder i feltet kan representere malmsoner.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	HE0086.01	Bedrock	Sampler: T,Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Semi-massive pyrite with some chalcopyrite in quartz. 10 cm thick layer in chlorite schist. From hangingwall north in trench. No. of registrated element analyses = 1
	HE0086.02	Dump	Sampler: T.Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Massive, banded fine-grained chalcopyrite with lesser pyrite and pyrrhotite. No. of registrated element analyses = 1
	HE0086.03	Bedrock	Sampler: T.Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Massive pyrite with some chalcopyrite. mm-scale banding and with chlorite bands. From footwall in trench, about 10 from northern end. No. of registrated element analyses = 1
	HE0086.04	Bedrock	Sampler: T.Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Semimassive 1-2 cm pyrite-band associated with quartz in sericitic chlorite schist. Sample from footwall about 35 m from northern end. No. of registrated element analyses = 1
	HE0086.05	Dump	Sampler: T.Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Banded massive pyrite with thin bands enriched in chalcopyrite and sphalerite. No. of registrated element analyses = 1
	HE0086.06	Bedrock	Sampler: T.Bjerkgård/...Stored: Løkken/...Size(kg): 3 Comment: Chlorite schist with lenses of chalcopyrite and sparse pyrite. Sample from hangingwall of the ore zone. No. of registrated element analyses = 1

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

Name of Locality: Oscar II

(Object Id: 10253 1,01,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Tynset (1619-1)

Map 1:250000:

Røros

Coordinate system:

UTM-Zone 33 - EUREF89/WGS84

East:

609170 m.

North:

6931040 m.

Longitude:

11.1204720

Latitude:

62.4946440

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:

Information(s) in free text format

Free text

Two small trenches, located about 400 m SW of the mine. The trenches were completely overgrown, and very little to see. The surrounding rocks was serpentinite and possibly also pyroxenite. It could be that these pits contained chromite mineralizations.

Name of Locality: Oscar II

(Object Id: 10254 1,02,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Dalsbygda (1620-2)

Map 1:250000:

Røros

Coordinate system:

UTM-Zone 33 - EUREF89/WGS84

East:

609960 m.

North:

6931770 m.

Longitude:

11.1362610

Latitude:

62.5009580

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:

Information(s) in free text format

Free text

Pit about 5 x 4 m wide and at least 1 m deep. Totally overgrown and no outcrops to see. A few small blocks of massive chlorite schist were found, probably representing metabasalt.

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The fact sheet was created on 08.05.2024

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