The Prattle Creek occurrence area is underlain by westerly dipping (60 degrees) carbonate rocks of the Middle Ordovician to Silurian Beaverfoot Formation and Middle Cambrian Snake Indian Formation. The carbonates are alternating conformable beds of dolomite and limestone within a tightly folded recumbent syncline. See PTC (083C 002) for a detailed regional geology description.

At one showing near a small unnamed lake, a silicified dolomite hosts disseminated red sphalerite with minor galena. A chip sample from a hand trench analysed 2.48 per cent zinc and 0.20 per cent lead (Assessment Report 21524). Another mineralized showing is situated 1.75 kilometres southeast of the trenched showing. Here, disseminated cubic galena occurs in white crystalline limestone.