在过去几年中,整个美国西部曾勘察出了许多低品位金—银矿床。由于最近金和银价格上涨,用堆浸法处理这类低品位矿石方面引起了人们极大的兴趣。用氰化物堆浸已能应用于多数这类低品位物料中,然而,要使堆浸成功,则应在成堆后,物料必须保持良好的渗透性,以便使氰化物浸液均匀地渗过物料。在较早的刊物中,矿山局在用标准堆浸法对难处理的某些物料进行预处理时,就对粉矿 In the past few years, many low-grade gold-silver deposits have been surveyed in the entire western United States. Due to the recent gold and silver price increases, there has been a great deal of interest in the heap leaching of such low grade ore. Heap leaching with cyanide has been used in most of these low grade materials, however, for heap leaching to be successful, the material must remain well permeable after piling in order to allow the cyanide liquor to permeate evenly materials. In earlier publications, the mine bureau pretreated certain refractory materials with standard heap leaching methods,