| Naics index | Naics index description |
|---|---|
| 212290 | Ruthenium ore mining and/or beneficiating |
| 212290 | Rutile mining and/or beneficiating |
| 212290 | Scheelite mining and/or beneficiating |
| 212290 | Tantalite mining and/or beneficiating |
| 212290 | Tantalum ores mining and/or beneficiating |
| 212290 | Thallium mining and/or beneficiating |
| 212290 | Thorite mining and/or beneficiating |
| 212290 | Thorium ores mining and/or beneficiating |
| 212290 | Tin metal concentrates beneficiating |
| 212290 | Tin metal ores mining and/or beneficiating |