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Post-closure flooding of the Homestake Mine at Lead, South Dakota

机译：南达科他州Lead的霍姆斯特克矿关闭后洪水

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The historic Homestake Gold Mine at Lead, SD, was closed in December of 2001 after 125 years of operation. Since closure, the mine was selected by the National Science Foundation as the proposed host site for the Deep Underground Science and Engineering Laboratory. Pumps in the 2,480-m- (8,150-ft-) deep mine were shut off on June 10, 2003. Post-closure flooding of the mine has resulted in rising water levels that reached the 1,524 m (5,000 ft) level in July of 2007. The rate of water inflow into the mine is about 47 L/s (750 gpm). A plot of water level vs. time shows that the rise has not followed an exponential decay curve. When the pumps are turned on for dewatering, the rate of water-level decline will be monitored. Water in the Homestake mine contains arsenic derived from arsenopyrite. In samples of mine water, the median concentration of arsenic was 0.012 mg/L, which is below South Dakota's surface-water aquatic life standard of 0.15 mg/L for beneficial use.
机译：经过125年的运营，历史悠久的，位于SD Lead的霍姆斯特克金矿于2001年12月关闭。自关闭以来，该矿被美国国家科学基金会选定为拟议中的深地下科学与工程实验室的所在地。 2003年6月10日，深达2,480米（8,150英尺）的矿井中的泵被关闭。矿井关闭后的洪水导致水位上升，到7月，水位达到了1,524 m（5,000英尺）。 2007年。流入矿井的水流量约为47 L / s（750 gpm）。水位与时间的关系图表明，上升没有遵循指数衰减曲线。当打开泵进行脱水时，将监控水位下降的速度。霍姆斯特克（Homestake）矿山的水中含有源自毒砂的砷。在矿井水样品中，砷的中位数浓度为0.012 mg / L，低于南达科他州有益使用的地表水生生物标准0.15 mg / L。

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