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THE world's production of copper during I27 years, since the beginning of the nineteenth century, amounts to more than 40,000,000 tons, according to the United States Bureau of Mines, Department of Commerce. In comparison, all previous production since the beginning of man's utilization ,)f copper .... estimated by some as less than a million tons-is relatively insignificant.
The important part played by the United States in supplying the world with copper is interesting aM significant, it is pointed out in an economic study of the production of copper during the nineteenth and twentieth centuries, which has just been completed by C. E. Julihn and the Common Metals Division of the Bureau of Mines. The l'nited States has produced more than 19,5oo,ooo tons of copper, or 48 per cent. of the world's output since I8OO, although the production of this country was negligible prior to I85o. The increase in rate of l-nited States production from 1845 to I917 was even greater than the increase in world production (luring the same period. During the six decades ending with I92O the average increase per decade in world production was 6o. I per cent. l)uring the same period the average increase in the l;nited States production was I45.8 per cent.
The lrnited States began to produce copper in the decade ending with 185o; the quantity produced was less than I per cent. of the world total. Following that decade, however, the increase was rapid up to the end of the nineteenth century, during the last decade of which the United States produced 52 per cent. of the world total. Since the.n the relation of the United States production to that of the world has remained fairly constant.
Of the world's output of copper since 18oo, about I }4 per cent. was produced in the 25-year period between I8OI and * Publislaed by permission of Director of the Bureau of Mines.
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