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Namew Lake |
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Manitoba, Canada |
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Cu Ni PGE PGM
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Super Porphyry Cu and Au
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The Namew Lake Fe-Ni-Cu massive sulphide deposit is located some 60 km south of Flin Flon in Manitoba, Canada.
The deposit is hosted by an un-differentiated metapyroxenite sill enclosed within Palaeoproterozoic orthogneisses and is covered by Palaeozoic sediments. The sill is believed to have been derived from either a low Mg komatiite or a high Mg basaltic magma.
Sulphide mineralisation is found as 3 to 10 mm blebs of disseminated Fe-Ni-Cu sulphides that accumulated during the crystallisation of olivine and pyroxene in the pyroxenite sill. A layer of massive sulphide that is 0.5 to 5 m thick is found below the hangingwall contact. The average content of the sulphides (recalculated to 100% sulphide) is 36% S, 42% Fe, 16% Ni, 6.1% Cu, 0.23% Zn, 148 ppm Pb, 5300 ppb Pd and 88 ppb Ir.
The sill and sulphides have been affected by up to 5 phases of deformation, and three stages of metamorphism.
Production until closure in 1993 totalled 2.57 Mt @ 0.63% Cu, 1.79% Ni, with 0.1 g/t Au, 4.1 g/t Ag, 0.5 g/t Pd, 0.6 g/t Pt.
For more detail consult the reference(s) listed below.
The most recent source geological information used to prepare this decription was dated: 1996.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Menard T, Lesher C M, Stowell H H, Price D P, Pickell J R, Onstott T C, Hulbert L 1996 - Geology, genesis, and metamorphic history of the Namew Lake Ni-Cu deposit, Manitoba: in Econ. Geol. v91 pp 1394-1413
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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