of sodium humate and lime in a low pH medium. By adding sodium humate to the pulp and adjusting the pH to 10–10.5,the recovery of Cu and combined Au, Ag and Mo in the cop-per concentrate was enhanced due to the reduced pH of the pulp. The following research showed that sodium humate was chemically adsorbed on the surface of pyrite and there was a strong hydrophilic interaction between sodium humate and the surface of pyrite