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Copper And Molybdenum Deposits In The United States

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Copper and molybdenum resources were not recognized as valuable commodities until economic needs demanded the collection and processing of these minerals in large amounts. The most expansive deposits of copper and molybdenum occur in massive low grade ores and are found in intrusive porphyry form ....

Middle of essay

....gs of numerous copper mines of which more than 90% were in the Lake Superior area giving an important advantage to the Union armies. Major copper production districts then shifted to Montana and Arizona in the early 1890's. Production increased to reach peak levels of 900,000 tons a year during World War I and in 1970 1,600,000 tons of copper were produced but recent levels are lower, fluctuating between 1-1.5 million tons a year. Technology has aided in increasing production efficiency wich ....
Number of words: 2613 Approximate pages: 10

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