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390                                     SIR ERNEST OPPENHEIMER
interests did not possess a monopoly of copper production, the world copper position was undoubtedly at that time dominated by the United States and the South American output controlled from the United States of America.
There were three inevitable consequences of this situation. First, the 'prestige value' attached to the opinions entertained by American mining engineers and by American metallurgists in the field of copper mining, smelting and refining was exceedingly high, and the services of such men were, correspondingly, eagerly sought. Secondly, the prospects for copper were greatly influenced from moment to moment by the attitude taken up by American producers, by the manner, in other words, in which they thought that current difficulties could be overcome. Thirdly, the financial strength of American interests, on the one hand, and the accumulated 'know-how' of their experts on the other, led to the question: how far should American interests be encouraged to take part in the development of the Northern Rho-desian fields? Was it possible to get American assistance without running the risk of American control; how far was it wise to rely upon American expert advice and place the future, technically, in the hands, neither of South Africans, Rhodesians nor Englishmen, but of Ameri­cans? The financial consequences were incalculable. These were to be matters of the gravest import in the developing Rhodesian situation, as the following pages will show. One single illustration, at this point, will suffice to show the impact of America. Writing to a co-director as late as August 1936, Ernest Oppenheimer pointed out, in discussing the then situation that:
We acted throughout on the advice of our American friends, because we had been told and believed that the copper problem—both the producing and selling ends—was one of which America possessed all the knowledge. Apart from this consideration, we were induced to follow the American advice because a large part of the funds required were to be supplied by America. . . .
Disillusionment followed in the crisis of the thirties; the point, how­ever, is the evident influence of the Americans.
Expert American opinion was by no means unanimous as to the value of the Rhodesian copper-fields. A. B. Emery, at the time general
made. The world copper situation in the inter-war years is covered by Alex Skelton, op. at., pp. 363-496: and the copper industry in the United States by Elizabeth S. May, PP- 537—591. The above-cited figures are taken from this book. The annual volumes of the (U.S.) publication Mineral Industry are also of great value.