The area of the M occurrence is underlain by phyllites and limestones of the Cambrian to Devonian Index Formation, Lardeau Group. A pluton of monzonite to granodiorite belonging to the Middle Jurassic Selkirk stocks intrudes the metasediments, developing mineralized skarns.

Trench M was excavated to follow up an exposure of massive magnetite and an adjacent outcrop containing chalcopyrite in a swarm of veinlets. In the trench, a central, gently east-dipping, silicified dolomite unit displayed a mottled dolomite globular pseudobreccia to mosaic breccia texture, composed of dark grey micritic clasts (45 per cent) in a secondary buff to white sparry dolomite matrix. Massive magnetite sheathed the dolomite along each wall, 45 centimetres thick on its footwall, and about 1 meter along the hangingwall. Within the silicified dolomite, two generations of subvertical quartz-ankerite-chalcopyrite veins range in width from 1 to 30 centimetres. The wider veins belonging to the earlier generation and are arranged in a dextral en-echelon pattern.

A series of 21 sawn channel samples were cut from the veined material, the adjacent magnetite and the wall rocks of chlorite schist even further to each side. The best assays were from some of the veins with four samples returning more than 0.1 per cent copper to a maximum of 0.3 per cent (Assessment Report 27696).

Trench ‘M’ was followed up with drill hole RN04-11, which was oriented to extend through the dolomite across its strike, and RN09-12 to intersect the veins. Results from these holes was not deemed encouraging.

Please refer to Ruger (082M 156) for further details of the Rain property.