Good find Sundowner ... I can't see why Hartley's would be concerned about the concept of heap-leaching. From what I've researched, heap-leaching can be one of the most economically viable ways of extracting gold and has been used for hundreds of years. Mind you, I also read that "The production of one gold ring through this method, can generate 20 tons of waste material".
If anyone's interested in a good explanation of heap-leaching, try this link:
http://www.kcareno.com/pdfs/mpd_heap_leach_desn_and_practice_07apr02.pdf
Good find Sundowner ... I can't see why Hartley's would be...
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