Spread in Yushu and Guolou areas in southern Qinghai Province and Ganzi and Aba areas in western Sichuan Province is mainly the cold highland covered with grass, called the cold grassy highland. To the east of these areas is shallowly-moderately dissected mountains. The unconsolidated overburden is composed of residual soil, clinosol and stream sediments. The modes of occurrence of the major indicator elements for gold mineralization, namely Au, As and Sb, occur mainly in such stable forms as sulfides, crystalline iron oxides and silicate residues, and subordinately as organically bound metals. It is held that, under the conditions of low temperature, cold grassy highland and low mountains or hills, the migration and enrichment of Au, As and Sb are mainly attributed to biogeochemical activities.