Heap leaching is something for dry conditions, I think all that rain would be a problem. Also it makes sense if you have 0.6 g/t vs 1.5 g/t deposits or something like that. At these grades the lower recovery rates of heap leaching could be prohibitive. Anyway, it just makes no difference. Heap leaching is for saving costs and if your AISC are ultra-low already...
Ann: Outstanding Assay Results at Ohio Creek, page-32
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