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Copper And Molybdenum Deposits In The United States
Beginning of essay|
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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