3295  Minerals and Earths, Ground or Otherwise Treated

Establishments operating without a mine or quarry and primarily engaged in
crushing, grinding, pulverizing, or otherwise preparing clay, ceramic, and
refractory minerals; barite; and miscellaneous nonmetallic minerals, except
fuels. These minerals are the crude products mined by establishments of
industry groups 145 and 149, and by those of industry 1479 mining barite.
Also included are establishments primarily crushing slag and preparing
roofing granules. The beneficiation or preparation of other minerals and
metallic ores, and the cleaning and grading of coal, are classified in
Division B, Mining, whether or not the operation is associated with a mine.