The Clum occurrence lies 4 kilometres southwest of Brisco, at the north end of Steamboat Mountain. Elevation on the property varies from 760 metres at the north end to 1,500 metres at the summit of Steamboat Mountain.

In 1981, AMAX of Canada Ltd., conducted preliminary mapping, prospecting and soil sampling over the showing. In 1982, AMAX commissioned an induced polarization survey to be done over the occurrence.

In the area, Cambrian and Silurian carbonate and clastic strata are separated from the Middle Proterozoic Mount Nelson dolomites and Upper Proterozoic coarse clastic rocks by a Mesozoic thrust fault, the north trending Mount Forster Steamboat Fault. The Paleozoic strata form a prominent syncline termed the Purcell Boundary Syncline. The Upper Cambrian to Middle Ordovician McKay Group, and the thin Middle or Upper Ordovician Mount Wilson quartzite underlie the mineralized hostrock, the Upper Ordovician to Lower Silurian Beaverfoot Formation. The Beaverfoot Formation, a gray, structureless, massive dolomite with local bands of chert nodules, occupies the core of the syncline. Here, the McKay Group is composed of interbedded limestone and limy argillite. The Beaverfoot dolomite is the hostrock for fine crystalline galena and sphalerite disseminated in restricted zones of white sparry dolomite breccia. The mineralization is considered to be Mississippi Valley type and epigenetic in origin.