| Naics index | Naics index description |
|---|---|
| 212290 | Cerium ores mining and/or beneficiating |
| 212290 | Chromite mining and/or beneficiating |
| 212290 | Chromium concentrates beneficiating |
| 212290 | Chromium ore mining and/or beneficiating |
| 212290 | Cinnabar mining and/or beneficiating |
| 212290 | Cobalt concentrates beneficiating |
| 212290 | Cobalt ores mining and/or beneficiating |
| 212290 | Columbite mining and/or beneficiating |
| 212290 | Columbium ores mining and/or beneficiating |
| 212290 | Ferberite ores and concentrates mining and/or beneficiating |