Management of potentially acid-generating (PAG) waste rock is an important element of environmental stewardship at hard rock mines. Mixing this material with non-PAG rock is common, but there appears to have been limited analysis of acceptable ratios, in particular where the waste rock is overwhelmingly non-PAG. The mine model for the Gold Acres Complex in Nevada was used to determine the most likely and worst-case PAG:non-PAG ratios. Humidity cells (HCTs) were run for PAG (144 weeks) and non-PAG (67 weeks) end members, together with mixtures at ratios of 2:98 (the most likely case; 47 weeks), 4:96 (reasonable worst-case; 136 weeks) and 10:90 (an unreasonable case; 47 weeks) to evaluate leachate quality; all of the mixtures remained pH-neutral. Incremental mineralogic changes over the course of the HCTs could not be ascertained because the samples had undergone 37 years of weathering in the open pit. However, a mass balance demonstrated that lower solute concentrations were released than expected based on the end-member leachate chemistry. A review of three other mines that layered, rather than blended PAG and non-PAG rock, shed light on process and characterization constraints.

潜在产酸 (PAG) 废石的管理是硬岩矿山环境管理的重要组成部分。将这种材料与非 PAG 岩石混合是很常见的，但似乎对可接受的比率进行了有限的分析，特别是在废石绝大多数是非 PAG 的情况下。内华达州 Gold Acres Complex 的矿山模型用于确定最有可能和最坏情况的 PAG：非 PAG 比率。对 PAG（144 周）和非 PAG（67 周）最终成员以及比例为 2:98（最可能的情况；47 周）、4:96（合理的最坏情况-案例；136 周）和 10:90（不合理案例；47 周）评估渗滤液质量；所有混合物均保持 pH 值中性。由于样品在露天矿中经历了 37 年的风化，因此无法确定 HCT 过程中矿物学的增量变化。然而，质量平衡表明释放的溶质浓度低于基于端元渗滤液化学的预期。对其他三个分层而不是混合 PAG 和非 PAG 岩石的矿山的回顾揭示了工艺和特征限制。