This invention provides a process of leaching gold that can be inexpensively and efficiently carried out without using cyan from the mixture containing sulfur and gold, typically from the material which contains sulfur and gold and is an intermediate product recovered by the flotation method in the hydrometallurgical method.Specifically, this invention provides a process of leaching gold from the mixture containing elemental sulfur and gold, comprising contacting said mixture and an aqueous solution of hydroxide of one or more of metals selected from the group consisting of alkali metals and alkaline earth metals, and reacting said hydroxides and elemental sulfur so that thiosulfate of corresponding metal, and thus, gold is leached by the thiosulfate produced.