Production of acid mine drainage may occur during mining operations and may continue for many years after closure. In some cases, especially when host rock is capable of reacting with acidic drainage, metal concentrations may decrease over time and distance. Seasonal variations in water flow rate also play an important role in metals concentration both in surface and groundwater. The present study evaluates the contamination of an abandoned pyrite mining area (Wieściszowice, SW Poland) and the temporal variation of the water contamination in selected locations of 2 sampling campaigns (2000 and 2015). The mining surrounding Rudawy Janowickie Mountains range is well known for the rich mining history and is considered as one of the oldest in Europe. The Wieściszowice pyrite mine was exploited for several hundreds of years and processed Fe and Cu sulfides, and sulfur. This mine was closed in 1925 because of the high competition of pyrites from Spain. Results show clearly that water samples collected in the mining area are mainly Ca–SO₄ and acid/high metal, while spring water and surface water samples, representing the local geochemical background, are Ca–HCO₃ and neutral-low metal. The analysis of data shows an improvement in water quality from 2000 to 2015 as well as a decreasing of water risk assessment for human use. This improvement can be related to the fact that 2015 was a very dry year, with over 60% less flow than in 2000, leading to less water contamination.

在采矿作业期间可能会产生酸性矿山排水，并可能在关闭后持续多年。在某些情况下，尤其是当母岩能够与酸性排水系统发生反应时，金属浓度可能会随着时间和距离的增加而降低。水流量的季节性变化对地表水和地下水中的金属浓度也起着重要作用。本研究评估了废弃的黄铁矿矿区（Wieściszowice，波兰西南部）的污染情况以及 2 个采样活动（2000 年和 2015 年）选定地点的水污染的时间变化。Rudawy Janowickie 山脉周围的采矿区以其丰富的采矿历史而闻名，被认为是欧洲最古老的采矿区之一。Wieściszowice 黄铁矿开采了数百年，并加工了 Fe 和 Cu 硫化物以及硫。由于来自西班牙的黄铁矿竞争激烈，该矿于 1925 年关闭。结果表明，矿区采集的水样主要为Ca-SO₄和酸性/高金属，而代表当地地球化学背景的泉水和地表水样品是 Ca-HCO ₃和中性低金属。数据分析表明，从 2000 年到 2015 年水质有所改善，人类用水风险评估有所下降。这种改善可能与 2015 年是非常干燥的一年有关，流量比 2000 年减少了 60% 以上，从而减少了水污染。