Ore mineralogy and the deportment of gold in various forms and sizes as well as preferential associations of gold with other minerals are important factors in the application of recovery processes to tellurides minerals. In some mines, telluride minerals forms compounds with mercury, silver, lead and small amounts of nickel. The main tellurides are Calaverite, sylvanite, krennerite, petzite and nagyagite. These minerals can be recovered by flotation and pyrite is a common contaminant. The material can be refractory to leaching and is necessary to consider an alternative process previous to cyanidation. Roasting is an option, but there are losses, gold deposition occurs on internal walls of the roaster. Basically, refractory occur is due to some of gold is finely disseminated in the host rock or in solid solution with pyrite.