TSK · Deuteronomy 8:9

and spoke to them, saying, "Return with much wealth to your tents, with very much livestock, with silver, with gold, with brass, with iron, and with very much clothing. Divide the spoil of your enemies with your brothers."

David prepared iron in abundance for the nails for the doors of the gates, and for the couplings; and brass in abundance without weight;

Iron is taken out of the earth, and copper is smelted out of the ore.