Official definition

This U.S. industry comprises: (1) establishments primarily engaged in developing the mine site and/or mining or quarrying crushed and broken stone (except limestone and granite); (2) preparation plants primarily engaged in beneficiating (e.g., grinding and pulverizing) stone (except limestone and granite); and (3) establishments primarily engaged in mining or quarrying bituminous limestone and bituminous sandstone. Illustrative Examples: Bituminous limestone mining and/or beneficiating Marble crushed and broken stone mining and/or beneficiating Bituminous sandstone mining and/or beneficiating Sandstone crushed and broken stone mining and/or beneficiating Cross-References. Establishments primarily engaged in--