| Naics index | Naics index description |
|---|---|
| 212323 | Burley mining and/or beneficiating |
| 212323 | China clay mining and/or beneficiating |
| 212323 | Clay bleaching |
| 212323 | Clay mining and/or beneficiating |
| 212323 | Clay, ball, mining and/or beneficiating |
| 212323 | Clay, ceramic and refractory minerals, mining and/or beneficiating |
| 212323 | Clay, fire, mining and/or beneficiating |
| 212323 | Clay, natural, mining and/or beneficiating |
| 212323 | Common clay mining and/or beneficiating |
| 212323 | Common shale mining and/or beneficiating |