Caledonia Mining upgrade to the Mineral Resource and Mineral Reserve at Blanket Mine Caledonia Mining Corporation Plc (LON:CMCL) has announced an upgrade to the Mineral Resource and Mineral Reserve base at its 64 per cent owned subsidiary, the Blanket Mine in Zimbabwe.[1] Total Proven and Probable Mineral Reserves increased by one per cent to 528,000 ounces (17 per cent increase including depletion of 84,925 ounces since last update) and a []