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Opemiska mines (Opemiska Copper Complex), Chibougamau mining district, Nord-du-Québec, Québec, Canadai
Regional Level Types
Opemiska mines (Opemiska Copper Complex)Group of Mines
Chibougamau mining districtMining District
Nord-du-Québec- not defined -
Québec- not defined -
CanadaCountry

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Latitude & Longitude (WGS84): 49° 47' 17'' North , 74° 51' 39'' West
Latitude & Longitude (decimal): 49.78833,-74.86111
GeoHash:G#: f2fg0rxy1
Owned/operated by:Power Ore Inc.
Locality type:Group of Mines
Köppen climate type:Dfc : Subarctic climate
Nearest Settlements:
PlacePopulationDistance
Chapais1,824 (2016)1.0km
Chibougamau7,563 (2018)38.3km


Opemiska Copper Mines Ltd mined a deposit consisting of a series of veins occupying fractures in gabbro. The ore mineral was chalcopyrite accompanied by lesser amounts of pyrite and magnetite. The gangue minerals were quartz and calcite. A shaft was first sunk on the property in 1936 but the mine was not put into production until 1954.

Note that the name of the mine, Opemiska, differs from that of nearby Lake Opemisca.

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


23 valid minerals.

Detailed Mineral List:

Arsenopyrite
Formula: FeAsS
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
'Axinite Group'
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
'Biotite'
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Bornite
Formula: Cu5FeS4
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Calcite
Formula: CaCO3
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Chalcocite
Formula: Cu2S
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Digenite
Formula: Cu9S5
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Galena
Formula: PbS
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Gersdorffite
Formula: NiAsS
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Gold
Formula: Au
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Heazlewoodite
Formula: Ni3S2
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Ilmenite
Formula: Fe2+TiO3
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Leucoxene
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Linnaeite
Formula: Co2+Co3+2S4
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Millerite
Formula: NiS
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Molybdenite
Formula: MoS2
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Pentlandite
Formula: (FexNiy)Σ9S8
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Pyrite
Formula: FeS2
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Pyrrhotite
Formula: Fe7S8
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Quartz
Formula: SiO2
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Rutile
Formula: TiO2
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Scheelite
Formula: Ca(WO4)
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Sphalerite
Formula: ZnS
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.
Stilpnomelane
Formula: (K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Reference: McMillan, R. H. (1973). Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. PhD Thesis University of Western Ontario.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Digenite2.BA.10Cu9S5
Galena2.CD.10PbS
Gersdorffite2.EB.25NiAsS
Heazlewoodite2.BB.05Ni3S2
Linnaeite2.DA.05Co2+Co3+2S4
Millerite2.CC.20NiS
Molybdenite2.EA.30MoS2
Pentlandite2.BB.15(FexNiy)Σ9S8
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Ilmenite4.CB.05Fe2+TiO3
Magnetite4.BB.05Fe2+Fe3+2O4
Quartz4.DA.05SiO2
Rutile4.DB.05TiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Scheelite7.GA.05Ca(WO4)
Group 9 - Silicates
Stilpnomelane9.EG.40(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Unclassified Minerals, Rocks, etc.
'Axinite Group'-
'Biotite'-
Leucoxene-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
Digenite2.4.7.3Cu9S5
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
Heazlewoodite2.5.3.1Ni3S2
AmBnXp, with (m+n):p = 9:8
Pentlandite2.7.1.1(FexNiy)Σ9S8
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Millerite2.8.16.1NiS
Pyrrhotite2.8.10.1Fe7S8
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 3:4
Linnaeite2.10.1.1Co2+Co3+2S4
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Gersdorffite2.12.3.2NiAsS
Molybdenite2.12.10.1MoS2
Pyrite2.12.1.1FeS2
Group 4 - SIMPLE OXIDES
A2X3
Ilmenite4.3.5.1Fe2+TiO3
AX2
Rutile4.4.1.1TiO2
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Scheelite48.1.2.1Ca(WO4)
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined islands
Stilpnomelane74.1.1.1(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Axinite Group'-
'Biotite'-
Leucoxene-

List of minerals for each chemical element

HHydrogen
H Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
CCarbon
C CalciteCaCO3
OOxygen
O MagnetiteFe2+Fe23+O4
O IlmeniteFe2+TiO3
O RutileTiO2
O QuartzSiO2
O CalciteCaCO3
O ScheeliteCa(WO4)
O Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
NaSodium
Na Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
MgMagnesium
Mg Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
AlAluminium
Al Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
SiSilicon
Si QuartzSiO2
Si Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
SSulfur
S PyriteFeS2
S PyrrhotiteFe7S8
S MilleriteNiS
S Pentlandite(FexNiy)Σ9S8
S LinnaeiteCo2+Co23+S4
S HeazlewooditeNi3S2
S BorniteCu5FeS4
S ChalcociteCu2S
S DigeniteCu9S5
S SphaleriteZnS
S GalenaPbS
S ArsenopyriteFeAsS
S GersdorffiteNiAsS
S MolybdeniteMoS2
KPotassium
K Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
CaCalcium
Ca CalciteCaCO3
Ca ScheeliteCa(WO4)
Ca Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
TiTitanium
Ti IlmeniteFe2+TiO3
Ti RutileTiO2
FeIron
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
Fe Pentlandite(FexNiy)Σ9S8
Fe BorniteCu5FeS4
Fe MagnetiteFe2+Fe23+O4
Fe ArsenopyriteFeAsS
Fe IlmeniteFe2+TiO3
Fe Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O
CoCobalt
Co LinnaeiteCo2+Co23+S4
NiNickel
Ni MilleriteNiS
Ni Pentlandite(FexNiy)Σ9S8
Ni HeazlewooditeNi3S2
Ni GersdorffiteNiAsS
CuCopper
Cu BorniteCu5FeS4
Cu ChalcociteCu2S
Cu DigeniteCu9S5
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
As GersdorffiteNiAsS
MoMolybdenum
Mo MolybdeniteMoS2
WTungsten
W ScheeliteCa(WO4)
AuGold
Au GoldAu
PbLead
Pb GalenaPbS

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neoarchean
2500 - 2800 Ma



ID: 3187871
Archean volcanic rocks

Age: Neoarchean (2500 - 2800 Ma)

Comments: Superior Province

Lithology: Mafic-ultramafic volcanic rocks; tholeiite

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Derry, D.R. and Folinsbee, J.C. (1955) Geology and structure of the Opemiska copper mine, Quebec. The Canadian Mining, Metallurgical Bulletin, September 1955, 589-595; Canadian Institute of Mining and Metallurgy, Transactions, Vol. LVIII: 333-339.
McMillan, R.H. (1973) Petrology, Geochemistry And Wallrock Alteration At Opemiska--a Vein Copper Deposit Crosscutting A Layered Archean Ultramafic-mafic Sill. Ph.D. Thesis University of Western Ontario.
Dubé, B. and Guha, J. (1992) Relationship between northeast-trending regional faults and Archean mesothermal gold-copper mineralization: Cooke mine, Abitibi greenstone
belt, Quebec, Canada. Economic Geology, 87: 1525-1540.

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