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西澳大利亚Yilgarn地块第三纪古河道系的砂金矿床,虽然品位低,但毕竟是该州的金矿资源。这些古河道处于地表以下60～100米之间,由松散的砂砾、粘土充填而成,且含有高盐分的地下水。用露天开采、地下开采及采金船等方法既不经济又不现实。初步认为,原地浸出是开发这种资源在技术和工业规模唯一可能成功的方法。 1985年,BHP-犹他矿物国际公司开始了该古河道原地浸出采金的试验室和现场可行性研究。
The placer gold deposits of the Tertiary Paleogene in the Yilgarn block in Western Australia, though of low grade, are, after all, the gold resources of the state. These ancient rivers, lying between 60 and 100 meters below the surface of the earth, are filled with loose gravel and clay and contain high salinity groundwater. Using open pit mining, underground mining and gold mining vessels and other methods are neither economical nor realistic. It is tentatively believed that in-situ leaching is the only method that could be successful in developing this resource at both technical and industrial scale. In 1985, BHP-Utah Minerals International started a laboratory and field feasibility study of in situ leaching of gold from this ancient channel.