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TitleMagmatic Ni-Cu-platinum-group element deposits of the Thompson Nickel Belt
AuthorLayton-Matthews,
SourceMineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods; by Goodfellow, W D (ed.); Geological Association of Canada, Mineral Deposits Division, Special Publication no. 5, 2007 p. 409-432
Year2007
Alt SeriesNatural Resources Canada, Contribution Series 20170065
PublisherGeological Association of Canada, Mineral Deposits Division (St. John's, NL, Canada)
Documentserial
Lang.English
Mediapaper; DVD
RelatedThis publication is contained in Goodfellow, W D; (2007). Mineral deposits of Canada: a synthesis of major deposit-types, district metallogeny, the evolution of geological provinces, and exploration methods, Geological Association of Canada, Mineral Deposits Division, Special Publication no. 5
File formatpdf
ProvinceManitoba
NTS63G; 63H; 63I; 63J; 63O/01; 63O/02; 63O/03; 63O/04; 63O/05; 63O/06; 63O/07; 63O/08; 63P/01; 63P/02; 63P/03; 63P/04; 63P/05; 63P/06; 63P/07; 63P/08
AreaThompson; Lake Winnipeg
Lat/Long WENS-100.0000 -96.0000 55.5000 53.0000
Subjectseconomic geology; metallic minerals; stratigraphy; mineralogy; igneous and metamorphic petrology; mineral occurrences; mineral deposits; mineral exploration; mineral potential; mineralization; nickel; copper; platinum; base metals; Archean; igneous rocks; intrusive rocks; ultramafic rocks; dunites; pyroxenites; peridotites; deformation; orogenesis; sulphides; metamorphism; Thompson Nickel Belt; Superior Province; Ospwagan Group; Manasan Formation; Thompson Formation; Pipe Formation; Setting Formation; Bah Lake Assemblage; William Lake Deposit; Thompson Deposit; Birchtree Deposit; Pipe Deposit; platinum group elements; Precambrian
Illustrationssketch maps; photographs; photomicrographs; tables; stratigraphic sections
ProgramConsolidating Canada's Geoscience Knowledge
ProgramTargeted Geoscience Initiative (TGI-3), 2005-2010
AbstractThe Circum-Superior Boundary Zone in Manitoba hosts several world-class magmatic Ni-Cu-platinum-group element (PGE) deposits. Operating mines in the Thompson Nickel Belt (TNB) include the Thompson T1, T3, and Birchtree mines. In 2004, the International Nickel Company (Inco) reported proven and probable reserves of 27 Mt grading 2.10% Ni and 0.14% Cu. These deposits are locally concentrated in a narrow, northeast-trending tectonic belt that represents collisional remnants of Archean Superior Province rocks, autochthonous Proterozoic supracrustal sequences (Ospwagan Group, TNB), and allochthonous Proterozoic rocks related to the Trans-Hudson Orogen. Since the discovery of Ni-Cu-(PGE) mineralization by Inco in 1955, it has been recognized that the TNB deposits exhibit
many fundamental characteristics of other major magmatic Ni-Cu-(PGE) districts.

Mineralization within the TNB is associated with variably serpentinized ultramafic intrusions that range in composition from dunite to pyroxenite and are hosted by clastic and chemical sediments of the Ospwagan Group. The serpentinized intrusions are generally lensoid to tabular in shape, which reflects the multiple phases of deformation experienced by the host Ospwagan Group during orogenesis. Ore within the TNB is found as 'primary' massive sulphide mineralization within the ultramafic bodies (i.e. Pipe and Birchtree deposits) or, more commonly, as 'secondary' massive sulphide mineralization within metasedimentary rocks of the Ospwagan Formation. Serpentinized intrusions occur at specific stratigraphic levels within the Ospwagan Group. The consistent stratigraphic correlations between ultramafic intrusions, S-rich chemical sedimentary rocks, S isotopic data, and Ni-Cu-(PGE) sulphide mineralization collectively suggest that the mineralization formed by assimilation of S-rich sedimentary rocks by high-temperature ultramafic magmas. Post-ore deformation and metamorphism have significantly modified the primary characteristics of many of the TNB ore deposits.
GEOSCAN ID224190