2011 – Conference of Metallurgists 2011, Montreal Canada


In-Situ Leaching (ISL) process plants are low cost producers for uranium deposits where
the geology is suitable. In the 1970s, a three-year pilot ISL program occurred on gold ore from the
Ajax Mine, Cripple Creek District, Colorado, using a chloride and iodide solution. The test
was halted due to poor results. With gold and silver the international ISL progress has been slow;
however the potential for low CAPEX and OPEX with large low grade deposits is real. Unless the
metallurgy has been demonstrated there are significant risks which could be fatal flaws to an ISL
gold or silver project. The metallurgy of gold and silver ISL projects is far from simple and it is
early days with project development.

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