Establishments primarily engaged in smelting and refining nonferrous metals, except copper and aluminum. Establishments primarily engaged in rolling, drawing, and extruding these nonferrous primary metals are classified in Industry 3356, and the production of bullion at the site of the mine is classified in Division B, Mining.
| Antifriction bearing metals, lead-base: primary | Platinum-group metals refining, primary |
| Antimony refining, primary | Precious metal refining, primary |
| Babbitt metal, primary | Primary refining of nonferrous metal: except copper and aluminum |
| Beryllium metal | Primary smelting of nonferrous metal: except copper and aluminum |
| Bismuth refining, primary | Refining of nonferrous metal, primary: except copper and aluminum |
| Blocks, zinc, primary | Rhenium refining, primary |
| Cadmium refining, primary | Selenium refining, primary |
| Chromium refining, primary | Silicon refining, primary (over 99 percent pure) |
| Cobalt refining, primary | Silicon, epitaxial (silicon alloy) |
| Columbium refining, primary | Silicon, pure |
| Germanium refining, primary | Silver refining, primary |
| Gold refining, primary | Slabs, primary: nonferrous metals, except copper and aluminum |
| Ingots, primary: nonferrous metals, except copper and aluminum | Smelting of nonferrous metal, primary: except copper and aluminum |
| Iridium refining, primary | Spelter (zinc), primary |
| Lead pigs, blocks, ingots, and refinery shapes: primary | Tantalum refining |
| Lead smelting and refining, primary | Tellurium refining, primary |
| Magnesium refining, primary | Tin base alloys, primary |
| Nickel refining, primary | Tin refining, primary |
| Nonferrous refining, primary: except copper and aluminum | Titanium metal sponge and granules |
| Nonferrous smelting, primary: except copper and aluminum | Zinc dust, primary |
| Pigs, primary: nonferrous metals, except copper and aluminum | Zirconium metal sponge and granules |
| Codes |
Titles | Total Marketable US Businesses |
| 33390000 | Primary nonferrous metals, nec | 106 |
| 33390100 | Lead and zinc | 5 |
| 33390101 | Antifriction bearing metals, lead-base | 5 |
| 33390102 | Lead smelting and refining (primary) | 3 |
| 33390103 | Zinc refining (primary), including slabs & dust | 5 |
| 33390104 | Zinc smelting (primary), including zinc residue | 1 |
| 33390200 | Precious metals | 224 |
| 33390201 | Gold refining (primary) | 23 |
| 33390202 | Platinum group metal refining (primary) | 10 |
| 33390203 | Silver refining (primary) | 4 |
| 33390300 | Silicon and chromium | 5 |
| 33390301 | Chromium refining (primary) | 1 |
| 33390302 | Silicon refining (primary, over 99% pure) | 5 |
| 33390303 | Silicon, epitaxial (silicon alloy) | 1 |
| 33390304 | Silicon, pure | 9 |
| 33399901 | Antimony refining (primary) | 7 |
| 33399902 | Babbitt metal (primary) | 2 |
| 33399903 | Beryllium metal | 4 |
| 33399904 | Bismuth refining (primary) | 0 |
| 33399905 | Cadmium refining (primary) | 2 |
| 33399906 | Cobalt refining (primary) | 2 |
| 33399907 | Columbian refining (primary) | 0 |
| 33399908 | Germanium refining (primary) | 0 |
| 33399910 | Magnesium refining (primary) | 1 |
| 33399911 | Nickel refining (primary) | 1 |
| 33399912 | Rhenium refining (primary) | 0 |
| 33399914 | Tantalum refining | 0 |
| 33399915 | Tellurium refining (primary) | 0 |
| 33399916 | Tin refining (primary) | 1 |
| 33399917 | Tin-base alloys (primary) | 2 |
| 33399918 | Titanium metal, sponge and granules | 5 |
| 33399919 | Zirconium metal, sponge and granules | 3 |
