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在美国的小型采矿业虽然有过长时期的衰退,但最近有不少小型金、银矿山却出现了自然的采矿高潮.这应归功于一项技术的发展,称之谓“堆浸”.这项工艺的实际意义是和采矿一样的古老,“把铜矿石筑成矿堆用溶液浸铜”,并已实践了500年以上.对小型贵金属矿山的采矿来说,现在的“革新”是基于二项新发展:
Despite the prolonged recession in the small-scale mining industry in the United States, many small gold and silver mines have recently emerged as a natural mining climax, thanks to a technological development called “heap leaching.” The practical significance of this process is as old as that of mining, which has been practiced for more than 500 years. “For the mining of small precious metals mines, the present” innovation "is based on Two new developments: