The exact location of the Mammoth showing is not known. It is assumed to be on the Mammoth Crown-granted claim (Lot 1488), about 300 metres northwest of the confluence of Bitter Creek and the Bear River, 12 kilometres north of Stewart.

A northwest trending conspicuous zone of shearing traverses the claims (Geological Survey of Canada Map 216A) and cuts generally north striking, west dipping andesitic volcanics of Lower Jurassic Unuk River Formation (Hazelton Group). The volcanic rocks are intruded by stocks of Jurassic(?) granodiorite (Bulletin 58; 63). Several north to north-northwest trending lamprophyre, quartz diorite or quartz monzonite, and augite-hornblende-feldspar porphyry dikes have been mapped on the Mammoth claim group (Assessment Report 759).

Mineralization comprises a 6 metre wide fracture zone seamed with quartz veins which cuts a band of argillite, intercalated with the volcanics. Parts of the zone are mineralized with pyrite, galena and sphalerite (Geological Survey of Canada Memoir 32 and 175).

Work History

In 1910 and 1911, the International (Portland) Mining Co. held the Mammoth group of eight claims, including the Mammoth claim, and carried out tunnelling and open cutting. No further work has been reported. In 1965, Canex Aerial Exploration conducted geological mapping on the adjacent B.G. claims, Aztec group (104A 043); this work included parts of the Mammoth group. In 1984, Tournigan Mining Explorations Ltd. carried out geological mapping and a stream sediment survey in the area. In 2017 and 2019, Bonanza Mining Corp. completed programs of prospecting, geochemical (rock and soil) sampling and ground geophysical (induced polarization, magnetic and gravity) surveys on the area as the MC property.