Description Caledonia Mining owns part or full interest in mining properties in Africa and Canada. Caledonia's mines and concessions contain gold, diamonds, cobalt, copper, nickel, and platinum. The company's Blanket mine in Zimbabwe produce gold, but its other properties are either idled or still in development. Caledonia's interests include tie-ups with Anglo-Australian mining giant BHP Billiton in Africa and with Stornoway Diamonds. The company expanded its Barbrook metallurgical plant in 2005, which more than doubled gold production for the company. But then, in 2008, the company turned around and sold Barbrook to Eastern Goldfields for about $10 million.