| 327992 |
Flint processing beyond beneficiation |
| 327992 |
Fuller's earth processing beyond beneficiating |
| 327992 |
Graphite, natural (e.g., ground, pulverized, refined, blended), manufacturing |
| 327992 |
Kaolin, processing beyond beneficiation |
| 327992 |
Lead, black (i.e., natural graphite), ground, refined, or blended, manufacturing |
| 327992 |
Magnesite, crude (e.g., calcined, dead-burned, ground), manufacturing |
| 327992 |
Mica processing beyond beneficiation |
| 327992 |
Perlite aggregates manufacturing |
| 327992 |
Perlite, expanded, manufacturing |
| 327992 |
Pumice (except abrasives) processing beyond beneficiation |