Natural copper ------ contains more than 99 per cent copper, but there are very few reserves.
Oxidised copper ores ----- are also few in number
Copper Sulphide Ore ----- has very low copper content, generally around 2 - 3%, more than 80% of the world's copper is refined from copper sulphide ore.
Copper concentrate ---- ore with high copper content selected before smelting.
Crude copper ------ copper concentrates smelted with a copper content of 95-98%.
Pure copper ------ copper with a content of 99% or more after fire-refining or electrolysis. Fire-refining yields 99-99.9% pure copper, and electrolysis can make copper 99.95-99.99% pure.
Brass ----- copper-zinc alloy
Bronze ----- copper tin alloy, etc. (in addition to zinc nickel, add other elements of the alloy are called bronze).
White brass ----- copper-cobalt-nickel alloy
