The Mam prospect is located 1.5 kilometres north of Blue Lake near Richter Pass. Osoyoos is 7.5 kilometres to the southeast.
The Mam occurrence lies within granodiorite and diorite of the Middle Jurassic Similkameen intrusions which have intruded quartzite, schist and greenstone rocks of the Carboniferous to Permian Kobau Group. To the north and east, the Kobau rocks are exposed. To the south, syenitic rocks of the Jurassic Kruger pluton occur. Fissuring, shearing and fracturing of andesite and other volcanic rocks on the property is extensive and is possibly related to the northwest trending Blue Lake fault.
Mineralization occurs in shear hosted quartz veins within granodiorite. The main vein is one centimetre to over 1.50 metres wide, strikes 135 degrees, dips 75 degrees southwest, and is traceable over a distance of 244 metres. Minerals hosted by the vein include pyrite, pyrrhotite, chalcopyrite, bornite, native silver, native gold and microscopic tellurides of gold, silver and bismuth. Alteration extends for considerable distances either side of the vein. Copper sulphides have been locally oxidized to malachite and azurite. Propylitic alteration minerals include chlorite, sericite, epidote, carbonate, calcite and feldspar.
The occurrence was staked on the Mam claims, which were acquired by Highmark Resources Ltd. from J. Markevich in 1979. In 1980, Highmark Resources Ltd. also acquired the Chickamin (Lot 799) and Divide (Lot 800) Reverted Crown grants and staked the ES, MS, CM, WR, BW and GM claims. Highmark carried out geological mapping, a geochemical soil survey, surface stripping and trenching and diamond drilling. Drilling consisted of 16 EXT holes totalling 453.5 metres and 8 BQ holes totalling 1153.9 metres. The Chickamin and Divide Reverted Crown grants were first Crown granted in 1895 to Adams British Columbia Co. Ltd. It is reported that a short adit was driven.
Sample #4, taken from a quartz vein in 1980, yielded 18.17 grams per tonne gold and 6.17 grams per tonne silver (Assessment Report 8830). In 1985, sampling of vein material returned up to 73.9 grams per tonne gold and 74.7 grams per tonne silver across 0.60 metres (Property File - Highmark Resources Ltd. (1985-04-01): Maps and letters - Mam).
