| 212114 |
Hard coal (i.e., anthracite) surface mining and/or beneficiating |
| 212114 |
Lignite surface mining and/or beneficiating |
| 212114 |
Preparation plants, coal |
| 212114 |
Semianthracite surface mining and/or beneficiating |
| 212114 |
Semibituminous coal surface mining and/or beneficiating |
| 212114 |
Strip mining, bituminous coal, lignite, or anthracite, on own account |
| 212114 |
Subbituminous coal surface mining and/or beneficiating |
| 212114 |
Tipple operation, bituminous coal mining and/or beneficiating |
| 212115 |
Bituminous coal or anthracite underground mine site development for own account |
| 212115 |
Bituminous coal or anthracite underground mining |