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Location: 193 km NE from Sioux Lookout, Ontario, Canada
Suite 1102, 141 Adelaide Street WTorontoOntario, CanadaM5H 3L5
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Early investigations of the Thierry Deposit by workers such as Bowdidge (1970), Patterson (1980), and Patterson and Watkinson (1983, 1984) concluded that the ores at the Thierry Deposit had undergone intense modification after their initial deposition as magmatic sulphides. This observation also applies to the K1-1 area. Any model of mineralized rock genesis at the Thierry Project must take into account the unusual Cu/Ni, Pt/Pd and chalcopyrite pyrrhotite ratios in the rocks. According to Naldrett and Cabri (1976), intrusive complexes similar to those at Thierry Deposit contain sulphides with a coppernickel ratio of 2:1, a platinum-palladium ratio of 1:4, and a chalcopyrite/pyrrhotite ratio of 1:10.These ratios at the Thierry Deposit are approximately: copper-nickel 8:1, platinum/palladium 1:4 and chalcopyrite/pyrrhotite 1:1. Mineralization at the main Thierry and adjacent K1-1 deposits, is more or less coincident with what is best characterized as a chlorite biotite-hornblende altered mylonitic shear zone (the “CBS shear zone”). The shear zone extends across the ultramafic intrusive along a strike length of about one kilometre and a width up to 50 m. Within the shear zone mineralization is hosted by highly schistose rocks containing stringer sulphides to less schistose ultramafic rocks containing massive stringers or veins and disseminated sulphides. Primary sulphides, listed in approximate order of decreasing abundance are pyrrhotite, chalcopyrite, pyrite and pentlandite. Cubanite, bornite, magnetite and minor ilmenite have also been identified. Violarite and mackinawite have developed from alteration of pentlandite.Outside of the main mineralized zone, chalcopyrite and bornite occur as stringers as well as finely dissemination sulphides. Bornite is commonly associated with carbonate and quartz veins. Oxidized mineralizations are reported to contain violarite, millerite and bornite.Copper-nickel-PGE mineralization at the Thierry and K1-1 deposits is hosted within a highly deformed and altered ultramafic sequence. Copper-nickel-PGE mineralization consists of: - Sulphide matrix breccia;- Blebs and small stringers, occasionally net textured sulphides; and- Disseminated sulphides.The sulphide mineral assemblage consists of chalcopyrite, pyrrhotite, pentlandite and pyrite.
