John Hays Hammond

John Hays Hammond (born March 31, 1855, San Francisco—died June 8, 1936, Gloucester, Mass., U.S.) was a U.S. mining engineer who helped develop gold mining in South Africa and California. In 1880 he was engaged by the U.S. Geological Survey for a study of the California goldfields; afterward, as a consulting engineer, he visited most of the countries of North and South America. Acting as a consulting engineer for British gold interests from 1893, he...