212234  Copper Ore and Nickel Ore Mining 

This U.S. industry comprises establishments primarily engaged in (1)
developing the mine site, mining, and/or beneficiating (i.e, preparing)
copper and/or nickel ores, and (2) recovering copper concentrates by
the precipitation, leaching, or electrowinning of copper ore. 

The data published with NAICS code 212234 include the following
SIC industries:

1021 Copper ores                                                               
                                                                
1099 Miscellaneous metal ores, n.e.c 
Industry 1061 Ferroallaoy ores, except vanadium (pt)