The Experimental Mine is situated in the Abitibi sub-province of the Superior structural province of the Canadian Shield. The Mine occupies the upper five levels of the former Beacon gold mine and the workings in the old LeRoy mine. Access is via a ramp from the surface. The Mine is at the southeastern corner of the Bourlamaque Batholith where the granodiorite intrudes the volcanic rocks.
Ubiquitous fractures reveal that the rock mass has been subjected to brittle deformation.
Quartz, carbonate, chlorite and tourmaline usually fill these fractures in varying proportion. These form the mineralization, with a northeast trend.