The structurally controlled Cu-Ni-PGE-Au deposits occur in the South Range of the Sudbury Structure and include Garson Mine #1, #4 and #5 Shears, 360 and 600 orebodies. Ni-Cu mineralization is typically remobilized into shear zones and related structural traps. These deposits occur within fault zones at the contact of the SIC and metasedimentary and metavolcanic rocks of the Huronian Supergroup. Mineralization occurs as a recrystallized sulphide matrix surrounding variably deformed clasts of local footwall metasediment, hanging wall norite and quartz vein material. This ore type is characterized by silicified footwall rocks, strong deformation of the mineralization, and late crosscutting quartz carbonate fractures with sphalerite, marcasite and galena, indicative of later hydrothermal activity.

Garson Mine uses Blasthole Stoping (slot-slash variation) and Uppers Retreat mining methods.

Ore is transported from the Ontario Operations mines and third party ore suppliers by rail and/or truck to Clarabelle Mill where it is blended together. The ore is crushed and ground, with the majority of the pyrrhotite removed through magnetic separation and sent to a designated waste storage area in the Copper Cliff tailings impoundment area. The remaining ore undergoes selective flotation to produce a bulk nickel and copper concentrate grading 14% Ni equivalent and approximately 8.5% Cu and 11% Ni. The concentrate is dewatered, mixed with custom concentrate feed and high-grade silica flux and conveyed to the smelter. The rock tailings are used for mine backfill, building dams in the Tailings area, or disposed of in the Copper Cliff tailings impoundment area.

Concentrate produced from the flotation process is used to generate a high copper concentrate by depressing the pentlandite, thus allowing the copper to float. The concentrate is then filtered to produce a filter cak ........