Greenstone Gold Mines GP Inc. (GGM), a joint venture partnership between Centerra Gold Inc. and Premier Gold Mines Ltd. is planning the construction, operation, decommissioning and closure of an open pit gold mine and associated ancillary activities, collectively known as the Hardrock Project. The Project is located in the Municipality of Greenstone, Ontario, in the Ward of Geraldton, at the intersection of Highway 11 and Michael Power Boulevard.

The Project is situated within a historical mine site for which GGM acquired the mining claim in December 2008. The property is a brownfield site that was actively mined during the 1930-1970s, and in later years was known as the MacLeod-Mosher complex. Since acquiring the property in 2008, GGM has completed a number of exploration programs and in 2012 submitted a closure plan and associated addenda to the Ministry of Northern Development and Mines (MNDM) for an advanced exploration program involving the dewatering of the historical underground working and installation of a ramp to access the underground for advanced exploration. The closure plan was accepted by the MNDM on April 5, 2012, but the advanced exploration program was not implemented as plans were modified to focus on on-going exploration from surface and the advancement of planning for an open pit mine.

The Project components include a main open pit and a satellite pit, ore processing facilities including crushing plants and ore milling and processing plant, waste rock storage areas (WRSAs), tailings management facility (TMF), natural gas-fuelled power plant and associated infrastructure, liquefied natural gas (LNG) plant, explosives manufacturing and storage facility, and other associated buildings and processes.