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Augustus Locke (1883-1981) was a geologist and expert on the technique of leached outcrop interpretation in mineral prospecting. He earned his Sc. D. degree from Harvard in 1913 and worked as a staff geologist for the Goldfields Consolidated Mining Company, Nevada, (1910) and Cia Minera Los Dos Estrellas, Mexico (1911-1912) before joining the Secondary Enrichment Investigation, financed by a group of major copper companies (1913-1915). He did subsequent scouting work in North America for the Calumet and Hecla Consolidated Copper Company. From 1915 on, he was a consulting mining geologist in San Francisco. Locke's work was worldwide in scope, including extensive mineral resource studies in the western United States, Mexico, Canada, and Cuba and less extensive work in South America, Africa, Asia, Europe, and the Philippines. He collaborated with numerous other geologists, including George Tunnel, H.M. Kingsbury, Paul Billingsley, P.F. Boswell, Roland Blanchard, E.H. Wisser, and E.H. Perry.