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采矿和提取冶金工业一般由拥有大量资金的大公司所控制。然而,如果采用堆浸法提取“贵重金属”,则小公司也有可能在北美洲开采金和银。采用堆浸法浸出贵金属矿石,系考虑到如下理由:第一,堆浸法的投资低。这点很重要,因为小公司通常不能进行大量投资。第二,堆浸操作的施工快速。内华达州的Lacana金有限公司的Relief Canyon矿山和国家银矿业总公司的Tonkin Springs矿山两个堆浸厂的建设只用了四个月。第三,堆浸的生产费用低。Glamis金有限公司所屈的亚利桑那州Yuma附近的Picacho矿山在1985年生产费用低于125美元/盎斯金。在内华达州,Smokey Valley矿业公司所属的Round矿山生产费用是221美元/盎斯金,共中不包括折旧费和股息。Barrick资源公司在内华达州联合进行堆浸操作,共生产成本为184美元/盎斯金。堆浸法使得低品位贵金属矿石的加工变得有利可图。特别是当采用低剥离比的露天采矿时就更为有利。Pegasus金有限公司所属的蒙大拿州Little Rock山区的Zortman-Landu sky矿山堆浸矿石品位为0.03盎斯金/吨矿石。Amselco矿业公司在内华达州Ely附近的Alligator Ridge矿山矿石开采品位为0.08盎斯金/吨矿石。Smokey Valley矿业公司在Smokey Valley矿山有效地开采品位低到0.008盎斯金/吨矿石,这是相当贫的矿石。正如
Mining and extraction The metallurgical industry is generally dominated by large corporations with large sums of money. However, small companies may also be able to mine gold and silver in North America if heap leaching is used to extract “precious metals.” Leaching heap leaching of precious metal ore, Department consider the following reasons: First, heap leaching method of low investment. This is important because small companies often can not make large investments. Second, the heap leaching operation is fast. The construction of two heap leachate plants at Relief Canyon Mine, Nevada’s Lacana Gold Ltd. and Tonkin Springs Mine, the national silver mining head office took only four months. Third, the cost of heap leaching is low. The Picacho mine near Yuma, Arizona, to which Glamis Gold Co. Ltd. has been subjected, produced in 1985 cost less than $ 125 per ounce of gold. In Nevada, Smokey Valley Mining Company’s Round mine production costs 221 US dollars / ounces of gold, the total excluding depreciation and dividends. Barrick Resources combined heap leaching operations in Nevada for a total cost of $ 184 per ounce of gold. The heap leaching method makes the processing of low grade precious metal ore profitable. Especially when using low peel ratio open-air mining is even more favorable. The Zortman-Landu sky mine in Little Rock, Montana, owned by Pegasus Gold Ltd, has a heap leach grade of 0.03 ounces per ton of ore. Amselco Mining Ltd. Alligator Ridge mine near Ely, Nev., Has a grade of 0.08 ounces gold / tonne ore. Smokey Valley Mining Company effectively mines at Smokey Valley mine as low as 0.008 ounces gold / ton ore, which is quite poor ore. Just as