The Mayou showing lies about 2.8 kilometres due north of the confluence of Roosevelt and Bitter creeks, 15 kilometres northeast of Stewart.
The area is predominantly underlain by north to north-northeast striking, folded argillites of the Middle Jurassic Salmon River Formation (Hazelton Group) (Bulletin 63). The sediments are cut by several north to northwest trending feldspar porphyry, quartz monzonite and lamprophyre dikes that belong to the Portland Canal dike swarm. Mineralization comprises several en echelon(?), limonitic zones across a width of about 100 to 150 metres and over an exposed length of approximately 300 metres.
A quartz-carbonate breccia zone is hosted in a feldspar porphyry dike. The zone, striking 312 degrees and dipping 70 degrees south, carries up to 5 per cent chalcopyrite and minor malachite. A chip sample across a width of 1.5 metres assayed 0.57 per cent copper, 3.8 grams per tonne silver, 0.03 gram per tonne gold, 0.01 per cent zinc and 0.01 per cent lead (Assessment Report 19242).
About 50 metres west of the breccia zone a parallel(?) quartz vein, containing malachite and chalcopyrite, is hosted in black argillite. A grab sample from the vein assayed 20.92 per cent copper, 42.2 grams per tonne silver, 0.10 gram per tonne gold, 0.05 per cent zinc and 0.01 per cent lead (Assessment Report 19242). Minor galena and sphalerite are also present locally (Assessment Report 12399).
In 1928, the Mayou Gold Copper Company acquired a group of claims, including the Mayou Nos. 1-2 claims, north of Bitter Creek. During 1928-30, the company carried out opencutting and emplaced two(?) adits on the claims. Reported production in 1929 was 7247 grams of silver, 432 kilograms of lead and 602 kilograms of zinc from 2 tonnes of ore. No further work was reported until 1983 when Nor-Con Exploration Ltd. conducted a prospecting and geological mapping program. In 1984, Maralgo Mines Limited flew an airborne VLF-EM and magnetometer survey over the area. No more work was reported until 1989 when Grey Silver Mines performed geological mapping, sampling and soil surveys in the area. The latter work included sampling on the showing. The following year Varitech Resources Ltd. conducted a program of geological mapping, sampling, prospecting and soil, VLF-EM and magnetometer surveys in the area. The showing was sampled again that year. In 2006, a helicopter-borne AeroTEM II electromagentic and magnetic survey was flown over the Silver Cloud property on behalf of Teuton Resources Corp. for a total of 150.0 line kilometres with 100 metre line spacings.
