The Molly Lake area is underlain by a marginal section of the Cretaceous Horsethief Batholith and sediments of the Middle Proterozoic Dutch Creek Formation (Purcell Supergroup).

The intrusive rock is a coarse-grained, greyish purple, quartz monzonite which is typical of the contact zone for about a 60 metre width. The Dutch Creek Formation is a dark reddish brown, biotite-rich hornfels, which is cut either by abundant white aplite dikes or by numerous quartz veins in different sections.

Smooth cliffs of quartz monzonite, facing north and measuring 91 metres in the east-west direction, contain at most 10 molybdenite-bearing veins. The mineralization consists of joints or fractures with or without quartz veining containing coarse pyrite and coarse molybdenite rosettes. Coarse, salmon-pink feldspar and grey glassy quartz occur between the sulphides. A grain of chalcopyrite was observed in mineralized talus blocks.

In 1971, Canadian Johns-Manville completed further surveys on its Slide group of claims and staked the Bev claims to cover newly found molybdenite showings, the Molly Lake showings. See also Molly Lake 2 (082KNE051).

A total of 77 geochemical samples were collected from the Bev area (Assessment Report 3581). The company did further mapping in 1972 and collected 271 samples from the Bev claims. In 1973, a further examination of the property was reported by the company (Assessment Report 4613).