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扩大有色金属的应用围范,使得有色冶金工业能源和原料资源的满足问题愈来愈尖锐。美国自身的矿物原料基地不足,国际市场原料价格上涨的趋势,促使美国对外贸易的赤字上升。仅1960～1978年间,美国有色金属的进口量(以目前的价格计)从10.4亿美元提高到84亿美元。七十年代末,进口原料的百分率为(%):原生铝94,钛89,锡84,镍80,锌66,钨58,铜20,铅9。美国能完全自给的原料只有镁、钼、稀土和锂。
Expand the application of non-ferrous metals Wai, making non-ferrous metallurgical industrial energy and raw materials to meet the increasingly acute problem of resources. The lack of bases for the United States' own mineral raw materials and the rising price of raw materials on the international market have prompted the U.S. deficit in foreign trade to rise. From 1960 to 1978 alone, U.S. non-ferrous metals imports (at current prices) increased from 1.04 billion U.S. dollars to 8.4 billion U.S. dollars. In the late 1970s, the percentage of imported raw materials was (%): primary aluminum 94, titanium 89, tin 84, nickel 80, zinc 66, tungsten 58, copper 20, and lead 9. The United States can only fully self-sufficient raw materials of magnesium, molybdenum, rare earths and lithium.