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.