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mechanism of leaching of semiconducting minerals such as CuS, ZnS, UO2, etc.,  has been the subject of intensive speculation by hydrometallurgy researchers  in the early 1950s who assumed the formation of intermediate surface  complexes that could be neither separated nor identified by physico-chemical  techniques. The electrochemical theory of leaching introduced in the late  1960s resolved this problem by comparing the leaching process to a corrosion  phenomenon similar to the corrosion of metals. A historical summary of these  proposals is presented

Leaching mechanism of semiconducting minerals a historical note