1 contant 97%min 21,CaCO3 97%min,MgO 0.6%max,SiO2 1% ... have our own quarry. After the professional eastimating, the total storage is more than 4 billion Metric tons of limestone. And ... the content of Calcium is the best one in China. Our production capacity for ... ,500,000 tons per year;The Precipitated Calcium Carbonate is more than 300,000 tons per year;The Hydroxide ...