The Mammoth property comprises four Crown-granted claims, Mammoth (Lot 6473), Sirdar (Lot 6471), Crescent (Lot 6472), Empire Fr. (Lot 6474), situated between 2070 and 2530 metres elevation, straddling the narrow northwest ridge extending from the summit of Mount Goldsmith (Goat Mountain). The original route to this remote mountaintop property was by steep mountain trail from the Incomappleux River valley, however, the only practical access nowadays is by helicopter, 9.7 kilometres northeast of Camborne.
Underlying rocks are chloritic schist or phyllites and limestones of the Cambrian to Devonian Lardeau Group.
The mine consists of an adit driven 180 metres southeast and several side tunnels crosscutting the main ridge. Some tunnels broke through to surface which now give views of the valleys of Boyd Creek to the east and the Incomappleux River to the northwest. These workings develop a seam of galena, pyrite and argentiferous tetrahedrite, up to 25 centimetres thick, on an essentially horizontal rolling fissure, dipping locally 5 to 10 degrees northeast, in a fine grained, dark grey limestone bed that strikes 150 degrees, and dips 80 degrees northeast. These beds are succeeded to the southwest by other units of the Lower Paleozoic Index Formation (Lardeau Group), including a bed of pure white crystalline limestone and west of that a thick band of green chlorite schist. The host rocks at the mine site are cut by a set of northeast striking vertical joints. Southeast from the adit, along the ridge, there are several small quartz veins and a band of limestone that has been heavily replaced by pyrite (with minor gold) and iron carbonates.
In 2005, grab samples from the adit area assayed up to 5.32 per cent lead, 13.23 per cent zinc, 396 grams per tonne silver and 0.27 grams per tonne gold. A 1 metre chip sample from inside the adit yielded 0.39 per cent lead, 12.42 per cent zinc and 96 grams per tonne silver (Assessment Report 27941).
The showings were discovered in 1903 and the property was worked from 1904 to 1907 by the Edward Baillie Syndicate of Nelson, B.C. Production amounted to 76 tonnes of hand-sorted ore that yielded 249 grams of gold, 483.6 kilograms of silver, 23.2 tonnes of lead and 1.95 tonnes of zinc. The claims were re-Crown granted in 1916 to W. Lawrence and G. Adams. The property was acquired in the early 1980s by P.F. Explorations Ltd. and subsesquently optioned to Summer 90 Resources Ltd. New Campbell Island Mines Limited optioned the property, including the Big Showing (082KNW078) and Scout (082KNW139), from Summer 90 Resources in 1984. Subsequent work by H.A. Simmons (International) Ltd. and W.J. Olsson and Associates Ltd. included geological mapping and geochemical soil and rock sampling. In 1988 and 1989, Consolidated Trout Lake Mines completed programs of geochemical sampling and airborne geophysical surveys on the area as apart of the Lexington Creek property.
During 2005 through 2012, Silver Phoenix Resources completed programs of prospecting, geological mapping, rock sampling and airborne geophysical surveys on the area.
In 2006, and 2007, assessment work was completed on the property by Discovery Consultants, R. I. Thompson for Silver Phoenix Resources Inc. including mapping and sampling the area.
