Industry: 3331—Primary Smelting and Refining of Copper
Establishments primarily engaged in smelting copper from the ore, and in refining copper by electrolytic or other processes. Establishments primarily engaged in rolling, drawing, or extruding copper are classified in Industry 3351.

Bars, refinery: primary copperCopper smelting and refining, primary
Blister copperPigs, copper
Blocks, copperPrimary smelting and refining of copper
Copper ingots and refinery bars, primarySlabs, copper: primary
Codes Titles Number of US Businesses
3331Primary Copper40
333100Primary copper23
33310000Primary copper23
333101Primary copper smelter products5
33310100Primary copper smelter products4
33310101Blister copper1
33310102Pigs, copper0
333102Refined primary copper products12
33310200Refined primary copper products3
33310201Bars (primary), copper1
33310202Billets (primary), copper0
33310203Blocks, copper1
33310204Cakes (primary), copper4
33310205Cathodes (primary), copper3
33310206Ingots and ingot bars (primary), copper0