The Molly occurrence is located on a hillside above a north-flowing tributary to the Osilinka River, approximately 180 kilometres northwest of the community of Fort St. James.

The occurrence is located on the western edge of the Omineca Belt within parautochthonous rocks of North American craton affinity. A Cambrian to Lower Devonian package consisting of the Razorback (Kechika and Road River groups equivalents), Echo Lake (Sandpile Group equivalent) and Otter Lakes (McDame Group equivalent) groups comprise a regional northwest-plunging anticline which is offset by faults and local drag folds. Sandy and argillaceous dolomite, massive limestone and minor calcareous slate comprise this Lower Paleozoic sequence.

The Molly showing is exposed in several trenches and pits. Bedrock is composed of dark grey to black limestone of the Ordovician to Lower Devonian Echo Lake Group with an average strike of 025 degrees and a dip of 40 degrees northwest. Sphalerite and barite with minor galena, quartz, calcite and pyrite occur as disseminations in irregular patches replacing the limestone. Locally, the mineralization occurs conformable to bedding and within the matrix of breccia zones. In 1951, a 4-metre chip sample from a trench assayed 6 per cent zinc, 0.015 per cent lead and 20 grams per tonne silver (Assessment Report 72).

In 1946, lead-zinc mineralization was discovered on the Molly claim. In 1951, Kennco Explorations (Canada) Limited conducted a plane table survey, sampled all principal showings, collected water samples from all streams in the area, and also took 552 tree samples.