Abstract: To realize the maximization of economic benefits of mine, study of gravity separation-carbon-in-pulp gold extraction process replaced gravity separation-flotation gold extraction process was carried out in Erdaogou Gold Industry Co.,Ltd, technology conditions of cyanide leaching were confirmed, results of industrial test which organized according with test parameters indicates, conclusion of test in laboratory is reliable and could be the basis for change of productive practice.

Key words: Cyanide leaching, Flotation, Leaching rate