mining in montana the diggings™
the most commonly listed primary commodities in montana mines are gold, silver, and lead . at the time these mines were surveyed, 2,093 mines in montana were observed to have ore mineralization in an outcrop, shallow pit, or isolated drill hole—known as an occurance mine. 1 montana has 1,549 prospect mines. 2 4,060 mines were in production at the time the data was entered into usgs records.