| 331410 |
Cobalt refining, primary |
| 331410 |
Copper alloys made in primary copper smelting and refining mills |
| 331410 |
Copper concentrate refining |
| 331410 |
Copper shapes (e.g., bar, billet, ingot, plate, sheet) made in primary copper smelting and refining mills |
| 331410 |
Gold bullion or dore bar produced at primary metal refineries |
| 331410 |
Gold refining, primary |
| 331410 |
Ingot, primary, nonferrous metals (except aluminum), manufacturing |
| 331410 |
Iridium refining, primary |
| 331410 |
Lead smelting and refining, primary |
| 331410 |
Magnesium refining, primary |