3339  Primary Smelting & Refining of Nonferrous Metals, Except Copper &
Aluminum

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.