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Hydrologic evaluation of post-closure flooding and dewatering of the Homestake Mine

机译：霍姆斯特克矿关闭后注水和脱水的水文评估

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The Homestake Mine included the open cut and underground workings up to 2,484 m (8,150 ft) deep. The mine ceased mining activities in December 2001 after 125 years of operation. Pumping from the underground workings continued for 18 more months until June 10, 2003. Homestake had completed a comprehensive hydrologic evaluation on post-closure underground flooding prior to the shutdown of pumping. After closure, the mine was selected by the National Science Foundation as the site for the Deep Underground Science and Engineering Laboratory (DUSEL). An interim laboratory facility will be set at the 1478 m (4850 ft) Level. The final facility will be set at the 2256 m (7400 ft) Level or deeper. Pumping from the underground workings began on June 5, 2008 by the South Dakota Science and Technology Authority (SDSTA). During the period of June 2008 through March 2009, the pumping rate increased from 41 Us (650 gpm) to 81 L/s (1,290 gpm) with an average rate of 60 L/s (950 gpm). As a result, the water level had been lowered more than 95 m (310 ft). It was found that the observed rebound and later decline to date is in close agreement with the model projections. Because of this, the authors of this paper reject claims of a lack of sufficient measurement devices in place and a lack of understanding of the hydrologic system at the Homestake Mine prior to shutdown of pumping in 2003 (Davis et al, 2009). Furthermore, it is believed that this validated model can serve as a useful tool for the SDSTA to manage future underground dewatering for the DUSEL operation. This paper evaluates the hydrologic conditions in the Home-stake Mine area and projects the post-closure groundwater rebound and decline due to D US EL pumping.
机译：霍姆斯特克矿包括深达2,484 m（8,150 ft）的露天开采和地下开采。经过125年的运营，该矿于2001年12月停止了采矿活动。直到2003年6月10日为止，地下作业的抽水持续了18个月以上。霍姆斯特克（Homestake）已在关闭抽水工程之前对关闭后的地下洪水进行了全面的水文评估。关闭后，该矿被国家科学基金会选定为深地下科学与工程实验室（DUSEL）的地点。临时实验室设施将设置在1478 m（4850 ft）的高度上。最终设施将设置在2256 m（7400 ft）或更深的位置。南达科他州科学技术局（SDSTA）于2008年6月5日开始从地下作业中抽水。在2008年6月至2009年3月期间，抽气速率从41 Us（650 gpm）提高到81 L / s（1,290 gpm），平均速率为60 L / s（950 gpm）。结果，水位降低了超过95 m（310 ft）。结果发现，观察到的反弹和迄今为止的下降与模型预测非常吻合。因此，本文的作者拒绝称缺乏适当的测量设备，并且对在2003年抽水关闭之前霍姆斯特克矿的水文系统缺乏了解（Davis等，2009）。此外，据信，这种经过验证的模型可以作为SDSTA管理DUSEL运营未来的地下脱水的有用工具。本文评估了霍姆索克矿山地区的水文条件，并预测了由于D US EL抽水造成的关闭后地下水回弹和下降。

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