The Trooper occurrence is located at the eastern end of Foley Lake.

The area is mapped by Monger as the Slollicum Schist, a metamorphic assemblage metamorphosed in the Cretaceous. At the Trooper showing, rocks are described as fine-grained, green, dacitic to andesitic tuffs interbedded with black argillites and graphitic phyllites. One microdiorite dike was observed, as was a large fault-bound mass of serpentinized, ultramafic rock.

Locally, two zones of mineralization are exposed. The mineralization consists of disseminations and clots of pyrrhotite with lesser amounts of chalcopyrite. In 1989, the best two samples (P89-1 and P89-2) assayed up to 2 grams per tonne silver, 0.02 per cent copper and 0.217 per cent zinc (Assessment Report 19699). Other samples of serpentinized ultramafic rocks yielded up to 0.141 per cent nickel (Assessment Report 19699).

In 1989, Castleford Resources completed a program geological mapping, a 1 line-kilometre VLF-EM geophysical survey and rock, soil and silt sampling on the area as the Trooper 4 claim.