引言在美国西部,许多低品位金银矿和以前开采的尾矿物料是贵金属的潜在资源。这些矿源品位太低或规模太小,以至不值得人们去投资建设氰化厂。因此,发展低成本提取贵金属的方法就显得十分必要。为此,美国矿业局研究了一种采用氰化堆浸低品位矿石提高金银回收率的方法。为了使堆浸成功,要求破碎后筑堆的矿石具有良好的渗透性,以使氰化浸出液流经 Introduction In the western United States, many low-grade gold and silver mines and previously harvested tailings materials are potential sources of precious metals. These mineral sources are too low or too small in size to be worth the money to invest in cyanidation plants. Therefore, the development of low-cost extraction of precious metals method becomes very necessary. To this end, the United States Bureau of Mines studied a cyanide heap leaching of low-grade ore to improve gold and silver recovery method. In order to make the heap leaching successful, it is required that the crushed ores have good permeability so that the cyanide leaching solution flows through