The Diavik operation mining diamonds from underneath a lake in the Northwest Territories of Canada. Visit http://www.diavik.com for more info about the mine . 

Timberline Resources Corporation is a diversified gold company comprised of three complementary business units: an underground mine with upcoming gold production, exploration, and drilling services. Its unique, vertically-integrated business model provides investors exposure to gold production, the “blue sky” potential of exploration, and the “picks and shovels” aspect of the mining industry. Timberline has contract core drilling subsidiaries [...]