Situated in the Sierra Madre mountains, San Marcial lies 90 kilometers east of Mazatlan in Mexico. It consists of a single claim totaling 1,250 hectares in a district that has produced silver, gold, lead and zinc.
The property is underlain by basal conglomerates, rhyolites, and dacites of the Upper Volcanic Group, with Lower Volcanic Group andesites and dacites underneath. The known silver veins are steeply dipping to the north east and are hosted in the Lower Volcanic Group. The mineralization forms quartz-sulphide veins and breccias up to 21 meters in width.