The Poorman occurrence area is underlain by moderately dipping Middle-Upper Cambrian Jubilee Formation limestone, with underlying conformable strata of the Helikian Purcell Supergroup (Nicol Creek and Sheppard formations) forming the western limb of the Lussier River syncline. The strata are intruded to the east by a Cretaceous monzonite stock.

At the Poorman shaft, tetrahedrite-chalcopyrite replacement- style mineralization occurs in Jubilee Formation limestone. The sulphides are developed along preferred fractures and have sharp contacts with the limestone. Oxidation has produced spectacular textures which form in the boxworks produced by weathering. Brilliant colours of malachite and azurite form the oxidized mineralization.

A rock chip sample at the shaft collar across a width of 1.2 metres assayed 4.35 grams per tonne gold, 29.13 grams per tonne silver, 1.23 per cent copper, 0.25 per cent zinc and 0.31 per cent lead (Assessment Report 19419).