149  Miscellaneous Nonmetallic Minerals, Except Fuels

Establishments primarily engaged in mining, quarrying, milling, or
otherwise preparing nonmetallic minerals, except fuels. This industry
includes the shaping of natural abrasive stones at the quarry.
Establishments primarily engaged in the production of blast, grinding, or
polishing sand are classified in industry 1446, and those calcining gypsum
are classified in Manufacturing, industry 3275.