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Of 1903 with its momentous changes in his life, Penrose with his accustomed modesty wrote (in a sketch of his life, dated December 27,1928) that he “resigned as President of the Commonwealth Mining and Milling Company, and proceeded to Utah, where he| became one of the founders, together with his brother Spencer Penrose, D. C. Jackling and Charles M. Mac-Neill, of the Utah Copper Company, which has since become a very important organization.” Today, one of the great sights of the world is Bingham Canyon, Utah, where the great open-pit mines of the Utah Copper Company represent the largest individual movement of material of any kind made by man in world history. It is famous in mining history as the first great mine to prove that the theory, advanced by a young metallurgist named Daniel C. Jackling, for the utilization of low-grade copper ore was workable and eminently profitable. In 1903, however, Bingham was just another mining community near Salt Lake City, its fabulous future undreamed of, even by its promoters. To be sure, it was one of the oldest of the Utah mining districts, having been worked since 1864, but its early history centered upon its production of silicious gold ore and silver-bearing lead ores. Today, it is famous as the largest single producer of copper in the world, the first shipment of copper ore having been made from the Highland Boy mine in December, 1896.

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