A year ago, U. S. copper producers were inclined to think that only this continent, in the future as in the past, could furnish copper in large amounts when the demand for the red metal revived. Some of them have been treated to a rude shock by the sudden recent prominence in the industry of the Katanga mines in mid-Africa.
These deposits, only lately put into heavy production, now have an annual output of 240,000,000 Ib. It has been estimated that they contain about 9,000,000,000 Ib. of extractable copper metal.
The mines are situated in...
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