Abstract
One important factor in determining bonding costs for mine reclamation is the steady-state infiltration rate of the heap leach pad(s). The importance of assessing each mine on a case-by-case basis is demonstrated. Long-term infiltration rates were investigated for 19 Nevada heaps: <2% at <1860 m above mean sea level (amsl) and <3% at >1860 m amsl. A common means of reducing steady-state infiltration rate is the application of a vegetative cover. Cover implementation costs can be optimised by mathematical modelling of precipitation flow through the heap. For the proposed Buffalo Valley mine, the post-closure heap equilibrium flux of ∼1 mm/year for a 0.9-, 1.2- or 1.5-m-thick cover was calculated after ∼11, 17, and 23 years, respectively, demonstrating that covers > 0.9 m (adequate for successful revegetation) accrue no incremental reduction in infiltration rate. The infiltration rate for this cover thickness (0.6%) was consistent with heaps at similar elevations.
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