I have 6 biggest mine type sky mine of calcium carbonate, all in the north of Caohuila Mexico, all this mine its high percent to calcium concern around 95.5 or more, white color.  I have reserve approx 650,000,000 ton in only one mine all this mines its located around 120 kms to Texas frontier, and the most important I have calcium carbonate in quantties and quality 

OTHER MINES FOR RENT STRONTIUM, LOWER BARIUM, WHITE COLOR, BARITE MINES ALL IN ONE REGION.