technically they are not refined or extracted from the copper
rather the copper is not pure copper but contains impurities of other metals.
it is these impurities which are extracted during the process of refining the COPPER
however:
$700 000 of gold at ~$300/oz = 2333 oz of gold.
2333 oz * 1600 lb. Cu/1 oz Au = 3, 700, 000 lb. Cu
that's a fuckin heavy roof!