331411  Primary Smelting and Refining of Copper

This U.S. industry comprises establishments primarily engaged in (1)
smelting copper ore and/or (2) the primary refining of copper by
electrolytic methods or other processes. Establishments in this
industry make primary copper and copper-based alloys, such as brass and
bronze, from ore or concentrates.

The data published with NAICS code 331411 include the following
SIC industry:

3331 Primary copper