Lac des Iles igneous complex

Lac des Iles igneous complex

The Lac des Iles igneous complex of northwestern Ontario is a layered gabbroic intrusion which is the host for the largest palladium orebody in Canada.http://www.infomine.com/minesite/minesite.asp?site=lacdesiles Infomine report on Lac des Iles] The orebody is currently being mined by a combined open pit and underground operation.

The complex is located in the Canadian shield some 85 kilometers northwest of Thunder Bay, Ontario and Lake Superior at 49.10.00 N 089.36.00 W.http://www4.geology.utoronto.ca/faculty/mungall/Website/igcp479namerica/dp512.html Geological Survey of Canada, World Minerals Geoscience Database Project, Entry #512] The complex includes gabbro, pyroxenite, gabbronorite and websterite intrusive into granitic gneiss country rock. The ore minerals occur within gabbroic pegmatites and gabbro breccia zones. The Archean complex has been dated at 2738 ±27 Ma by Sm-Nd dating on pyroxenite.

The Roby Zone orebody of the complex is a PGE deposit with associated gold, copper and nickel mineralization. Ore mineralogy includes pyrrhotite, pentlandite, chalcopyrite, pyrite and the rare PGE minerals: vysotskite (Pd,Ni)S, braggite (Pt,Pd,Ni)S, kotulskite Pd(Te,Bi)1-2, isomertieite Pd11Sb2As2, merenskyite (Pd,Pt)(Te,Bi}2, sperrylite PtAs2 and moncheite (Pt,Pd)(Te,Bi)2. [http://www.mindat.org/loc-43996.html Mindat]

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