In Arizona, 45 miles from Tucson, lies the nation's biggest untapped source of copper. It is the 4,411-acre San Manuel field, which geologists estimate contains 460 million tons of oreenough to last the U.S. for about three years. But it has not been exploited because the low-grade ore would be enormously expensive to mine and process.
Last week RFC Boss W. Stuart Symington hinted that the Government may lend $75 million to put San Manuel to work to help ease the copper shortage. The loan was requested by little Magma Copper Co., sixth on the list of U.S. copper producers and owner...
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