Crushing hi grade gold ore to melt a gold bar - YouTube
gold recovery operations are described in detail. In addition, the reported efficiency and reliability of various types of equip-ment used today is presented. One notable method not described is the cyanide process, the recovery of gold through leaching with cyanide, a hazardous substance that must be handled with great care.method for large-scale operations, whereas underground mining is generally the most . . Most bauxite, iron, and copper ore is mined by open pit techniques, lead and zinc ore are principally extracted by underground mining methods, and precious metals, particularly gold and most notably in the USA and . Surface Mining Methods and Equipment .