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.
- Barite, ground or otherwise treated
- Barium, ground or otherwise treated
- Blast furnace slag
- Clay for petroleum refining, chemically processed
- Clay, ground or otherwise treated
- Desiccants, activated: clay
- Diatomaceous earth, ground or otherwise treated
- Feldspar, ground or otherwise treated
- Filtering clays, treated purchased materials
- Flint, ground or otherwise treated
- Foundry facings, ground or otherwise treated
- Fuller’s earth, ground or otherwise treated
- Graphite, natural: ground, pulverized, refined, or blended
- Kaolin, ground or otherwise treated
- Lead, black (natural graphite): ground, refined, or blended
- Magnesite, crude: ground, calcined, or dead-burned
- Mica, ground or otherwise treated
- Perlite aggregate
- Perlite, expanded
- Plumbago: ground, refined, or blended
- Pulverized earth
- Pumice, ground or otherwise treated
- Pyrophyllite, ground or otherwise treated
- Roofing granules
- Shale, expanded
- Silicon, ultra high purity: treated purchased materials
- Slag, crushed or ground
- Spar, ground or otherwise treated
- Steatite, ground or otherwise treated
- Talc, ground or otherwise treated
- Vermiculite, ex-foliated