Procedure FCO On Mali Third largest Gold Producer In West ...
2014-5-26 · Most major gold mines process their gold-bearing ore on site to produce ''doré'' bars of up to 92% purity. Refineries: Mines send doré bars to refineries around the world, where the remaining impurities are removed to create gold of from 99.5% to 99.99% purity. This is the impurities need to be removed. Iron: 2.00%.