Table II — North American Production of Copper (in Short Tons of 2,000 Lbs.)
| 1909. | 1910. | ||
| Alaska, | 2,028 | 2,504 | |
| Arizona, | 146,021 | 149,803 | |
| California, | 26,679 | 22,897 | |
| Colorado, | 5,244 | 5,063 | |
| Idaho, | 3,885 | 3,108 | |
| Michigan, | 113,624 | 110,700 | |
| Montana, | 156,918 | 143,121 | |
| Nevada, | 25,917 | 31,944 | (about 6,000 tons in 1908) |
| New Mexico, | 2,567 | 1,816 | |
| Utah, | 50,219 | 62,521 | (about 35,000 tons in 1908) |
| Wyoming, | 44 | 90 | |
| South and East, | 11,409 | 9,098 | |
| Other States, | 1,973 | 463 | |
| Totals, | 546,538 | 543,125 | |
| ═════ | ═════ |
There will be noticed a decline in the production of the United States during the year 1910, resulting from the present movement to restrict output whilst the large accumulated stocks of metal are being absorbed. The movement is probably more or less temporary, and is being largely directed by American financiers who are endeavouring to bring about an international agreement on the subject.
Regarding the American output, the marked movement for curtailment in Montana has reduced the output of that State to such an extent, that the position it gained in 1909, of being the greatest producing State once more reverts to Arizona. The increases from Nevada and Utah, in which developments on a large scale are commencing, may be noted.
References.
Percy, John, “Metallurgy (Copper).”
Gowland, William, Presidential Address, Trans. Inst. Mining and Metallurgy, vol. xvi., 1906–7, pp. 265–291.
Stevens, H. J.,“The Copper Handbook.”
Brown, N., and Turnbull, C. C., “A Century of Copper.”
Engineering and Mining Journal, “Copper Production.” May 6th, 1910, p. 891.
Mineral Statistics of the United Kingdom.
Mineral Industry.