Langlois sulphide zones are near vertical lenses comprised primarily of sphalerite and pyrite with lesser chalcopyrite and pyrrhotite. Galena and gold are found in low quantities. There is strong geological continuity of the mineralization as demonstrated in the extensive diamond drilling and underground development.

The Langlois mine facilities include a head frame, hoisting plant, paste backfill plant, mechanical and electrical shops, a service building, a 2,500 tpd zinc/copper concentrator and a tailings pond.