Editor’s note: Each year. Mining Engineering features an industrial minerals review. Several people put in a fair amount of time in developing the material for this issue, all the while doing their own jobs. Thank you to the industrial minerals annual review editor, to the Industrial Minerals and Aggregates Division technical committee chair and vice-chairs, and to the authors of the individual commodity profiles. Rajesh Raitani, member SME,of Cytec Industries Inc., is chair of the Industrial Minerals & Aggregates Division’s Technical Committee. Their help makes possible this July industrial minerals issue. On behalf of ME readers, the editors thank them. Four companies – H.C. Spinks Clay Co., Inc., Imerys. Old Hickory Clay Co., and Unimin Corp. – mined ball clay in four states in 2013. On the basis of preliminary data, production was 1 Mt (1.1 million st) with an estimated value of $47 million. Production increased by 3 percent in tonnage from 973 kt (1.1 million st) with a value of $45.1 million in 2012. Tennessee was the leading producer accounting for 64 percent of domestic production, followed by Texas. Mississippi and Kentucky. About 67 percent ...