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据美国矿山局报告,由于产量提高和金属市场价格上涨,美国1979年金属产值比1978年增长22%.1979年,美国22种主要金属的总产值达85.25亿美元,而78年则为69.92亿元.1979年中,铜价显著上涨,1978年为67美分/磅,至79年12月涨至1.07美元/磅,79年产量提高了5%,使总产值达29亿美元.铅价亦上涨,虽然产量削减了4%,从58.5万吨降到56.1万吨,但因价格由78年平均34美分/磅,涨至79年平均52.8美分/磅,使产值提高了51%.由于矿山倒闭和罢工,锌的产量下降至1932年以来的最低水平,减少了14%,但因79年价格由31美分/磅涨至37.4美分/磅,故产值也增加了4%.金、银价格也在剧增,金价的上涨刺激了美国在西部各州大力寻找金矿活动,但由于价格上涨致使开采品位降
According to the U.S. Bureau of Mines and Mines, metal output in the United States rose 22% in 1979 over 1978 as a result of increased production and higher metal market prices. In 1979, the total output value of 22 major metals in the United States reached 8.525 billion U.S. dollars, compared with 6.992 billion U.S. dollars in 1978 In 1979, the price of copper rose significantly from 67 cents / lb in 1978 to 1.07 in December 79, up 79% from the previous year, bringing the total output value to 2.9 billion U.S. dollars. However, the output was cut by 4% from 585,000 tons to 561,000 tons, but the price increased by 51% from an average of 34 cents / lb in 1978 to an average of 52.8 cents / lb in 1979. Zinc production dropped 14% to its lowest level since 1932 as a result of mining closures and strikes, but output also increased 4% as prices rose from 31 cents / lb to 37.4 cents / lb in 79 years. The price of gold and silver is also on the rise. The rise of the gold price has stimulated the United States to vigorously look for gold activities in the western states, but the price of mining has dropped due to the price hike