Jul 16, 2018 . EPA promulgated the Ore Mining and Dressing Effluent Guidelines and Standards . during ore extraction, from water used by operators for equipment cooling and . Copper, Lead, Zinc, Gold, Silver, and Molybdenum Ores.
Gold extraction refers to the processes required to extract gold from its ores. This may require a combination of comminution, mineral processing, . Normally, the ore is crushed and agglomerated prior to heap leaching. . to a greater or lesser extent with silver (as electrum), or sometimes with mercury (as an amalgam).