As the fire burns down the roasted ore and charcoal will fall into the cauldron and heat up to a bright orange color. We continue to add new wood and ore to the top of the stack as long as we like. The roasted ore will fall through the holes in the cauldron every once in a while. Ore that has fallen on the sheet metal is visible in this picture.
Dec 07, 2018· Gold ore can resemble quartz with spotty areas of gold. According to the Environmental Protection Agency, gold is commonly mixed with silver and other metals. The ore may, therefore, contain sulfides like arsenic, copper, iron, and silver. The ore does not commonly have visible shiny gold on the surface.
Metallurgical ContentRecover Gold by Roasting Pyrite OreRoasting of flotation concentratesRoasting Arsenopyrite Ore for GoldRoasting and leaching a sulphide concentrateRoasting and Processing Sulpho telluride ore to recover goldFluoSolids Roasting SystemRoasting with a FluoSolids reactorWhy use Salts in the roasting processROASTING
Jul 16, 2014· During roasting, refractory gold ore is treated with extremely hot air. This causes the sulfites to oxidize, separate from the ore, and become sulfur dioxide. Once all of the sulfides are oxidized, the remaining gold ore can be processed normally. The roasting method has been around for hundreds of years.