The Berg occurrence is located in the Cassiar Mountains along the Tootsee River, 6 kilometres upstream from the British Columbia-Yukon border.

The showing comprises iron manganese gossans and oxidized lead-zinc-silver mineralization in brecciated, silicified Upper Devonian-Lower Mississippian Earn Group shales and siltstones in a screen overlying a thick package of Middle-Upper Devonian McDame Group carbonates. The occurrence contains hydrozincite, cerussite and barite. Galena, sphalerite and pyrite have also been reported. Mineralization on the Berg property consists of fine-grained galena, light brown sphalerite, pyrite and a greenish yellow mineral occurring in a knob of rusty rock about 30 metres in diameter.

In 1979, rock sampling (L611 to L618) from trenches yielded up to 6.2 grams per tonne silver, 0.2 per cent lead and 2.1 per cent zinc (Assessment Report 8061).

In 1978, a regional stream sediment and water geochemical reconnaissance program was conducted by the Geological Survey of Canada jointly with the British Columbia Department of Energy, Mines and Petroleum Resources. The field results released in June 1979 indicated several unstaked, anomalous drainages, three of which were subsequently staked by Cassiar Asbestos Corporation Limited. The claim blocks were extended in October 1979 to provide better coverage of the three areas of interest. In 1979, prospecting and sampling was conducted by Cassiar Asbestos Corporation Limited.

Sometime prior to 1968, seven very large "cat" trenches were cut in the Berg showing yielding little visible mineralization. Apparently, no assessment work was filed for this work and it is not known which company did the trenching (Assessment Report 8061).