Abstract
Leach pad closure is a site and material specific consideration. This paper presents a summary of analytical and field studies conducted to determine the requirements for rinsing heap leach residue in conjunction with reclamation activities. An analytical model, based on simple dilution, was proposed for projecting changes in cyanide concentration following fresh water rinsing. A 23-month field test utilizing three test heaps verified that the weak acid dissociable cyanide concentration of effluent from the heaps was being reduced by half for each bed volume of fresh water applied to the pilot-scale test heaps. Whether rinsing is a valid part of closure depends on hydrogeologic and geochemical conditions within the heap and may not be appropriate in all cases.
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