Heap leaching of gold and silver ores is conducted at approximately 120 mines worldwide. Heap
leaching is one of several alternative process methods for treating precious metal ores, and is
selected primarily to take advantage of its low capital cost relative to other methods. Thirty-seven
different heap leach operations with a total production of 198 tonnes of gold per year (6,150,000
ounces/yr.) were surveyed to determine operating practice. These operations together produce
7.4% of the world's gold. When mines not surveyed are taken into account, it is likely that heap
leaching produces 12% of the world's gold. Heap leaching for silver is conducted using the same
principles and operating practices as for gold, but heap leach operations produce only a small
fraction of world silver production.
http://www.kcareno.com/pdfs/mpd_heap_leach_desn_and_practice_07apr02.pdf
Due to low cost set up why is it not feasible to replicate several processing facilities at the one site?
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