| 331410 |
Refining nonferrous metals and alloys (except aluminum), primary |
| 331410 |
Rhenium refining, primary |
| 331410 |
Selenium refining, primary |
| 331410 |
Silver bullion or dore bar produced at primary metal refineries |
| 331410 |
Silver refining, primary |
| 331410 |
Slab, nonferrous metals (except aluminum) primary |
| 331410 |
Smelting of nonferrous metals (except aluminum), primary |
| 331410 |
Tantalum refining, primary |
| 331410 |
Tellurium refining, primary |
| 331410 |
Tin base alloys made in primary tin smelting and refining mills |