The Whopper South (WB 4) occurrence is located at an elevation of approximately 2110 metres on a northeast-trending ridge of Mount McKay, south of White Boar Lake and approximately 1.0-kilometre northeast of the peak of Mount McKay.

Regionally, the area is underlain by siltstones, greywackes, quartzites and phyllites of the Proterozoic Upper and Middle Aldridge and Lower Creston formations (Purcell Supergroup), intruded by a small quartz monzonite stock, possibly Cretaceous. The Lower Creston Formation consists mainly of laminated to thickly bedded argillites and siltites with minor fine-grained quartz wackes. The rocks are waxy green to olive in colour with tan-weathering surfaces, wavy bedding and abundant mudcracks. Rocks of the Upper Aldridge consist of a relatively homogeneous unit with occasional thin interbeds of rusty weathering light grey quartzite and laminated light and dark grey argillaceous quartzite. Locally, these rocks are intruded by gabbro or diorite sills and dikes of the Moyie Intrusions. The intrusive stock consists of medium- to fine-grained massive biotite monzogranite. The sediments adjacent to the intrusion have been altered to produce concentric zones of biotite hornfels and siliceous siltstone.

Locally, a 10-metre wide zone of sheared quartzite and black argillite hosts galena mineralization associated with limonite and pyrite.

In 2007, a sample (W-69) assayed 0.45 per cent lead, 0.10 per cent zinc and 33.8 grams per tonne silver (Assessment Report 30057).

Work History

The area has been explored in conjunction with the nearby Whopper (MINFILE 082FNE001) occurrence, and a complete exploration history of the area can be found there.