The Clair 21 occurrence is located on a northeast flowing tributary of Mathew Creek at an elevation of 1735 metres and approximately 4.5 kilometres north east of Pyramid Mountain.

Regionally, the area is underlain by argillite, greywacke, wacke and turbidites of the middle Proterozoic Aldridge Formation (Purcell Supergroup). These have been intruded by gabbroic sills of the middle Proterozoic Moyie Intrusions. A full description of regional geology can be found in the Sullivan (MINFILE 082FNE052) occurrence.

Locally, as defined by drilling, laminated quartzitic wacke, quartz wacke, quartz arenite and wacke host two sulphide bands, 0.6 and 1.2 metres wide, over an interval of 6.1 metres, starting at 119.8 metres down hole and associated with zones of fracturing. The sulphides are composed of sphalerite, galena and pyrrhotite and occur as irregular fractures and narrow veinlets, up to 2 centimetres thick, with quartz and chlorite. Minor chalcopyrite is also reported in the hole.

1983, a visual estimation of mineralized core from diamond drill hole 83-1 yielded 2.5 per cent combined lead and zinc over 1.2 metres (Assessment Report 12126).

In 1983, Cominco drilled one diamond drill hole, totalling 850.0 metres, on the Clair 21 claim. In 1987, Cominco completed one diamond drill hole, totalling 304.0 metres, on the Mat 265 claim. During 1996 through 1999, Abitibi Mining completed programs of rock, soil and silt sampling, prospecting and geological mapping on the area. In 1999 and 2000, Rio Algom Exploration completed programs of geological mapping and a single diamond drill hole, totalling 1005.2 metres, on the area.