This class includes:
——mining and preparation of ores valued chiefly for non-ferrous metal content: aluminium (bauxite), copper, lead, zinc, tin, manganese, chrome, nickel, cobalt, molybdenum, tantalum, vanadium etc., precious metals: gold, silver, platinum

This class excludes:
——mining and preparation of uranium and thorium ores, see 0721
——production of aluminium oxide and mattes of nickel or of copper, see 2420