21232 Sand, Gravel, Clay, and Ceramic and Refractory Minerals Mining and Quarrying

This industry group comprises establishments primarily engaged in the following:

1. developing the mine site and/or mining, quarrying, dredging for sand and gravel, or mining clay, (e.g., china clay, paper clay and slip clay) and
2. preparation plants primarily engaged in beneficiating (e.g., washing, screening, and grinding) sand and gravel, clay, and ceramic and refractory minerals.