Van Tuyl, Francis Maurice, 1887-1975Gabriel, V. Gavrilovich2016-09-292022-02-032016-09-292022-02-031933https://hdl.handle.net/11124/170443Includes bibliographical references.Includes maps.doctoral dissertationsengCopyright of the original work is retained by the author.Placer deposits -- ColoradoGold ores -- ColoradoMines and mineral resources -- ColoradoGold mines and mining -- ColoradoText