尾矿库污染物运移问题对尾矿库周边地下水安全有重要的影响，因此准确地掌握尾矿库渗流及污染物运移规律，对保护矿区的地下水安全具有重大的意义。根据渗流理论以及河谷区坡度大、地形高差大、含水层倾斜的实际情况，建立以水平多层剖分方式的尾矿库水文地质概化模型，运用Visual Modflow 中MT3DMS模块对研究区氨氮在地下水中的运移规律进行模拟分析。结果表明：氨氮在地下水中的运移方向与地下水水流方向基本一致，氨氮浓度随着迁移距离的增大而减小。

The contaminant seepage problem of tailing-dam is an important factor affecting the safety of ground water of the tailing-dam, so accurately understanding the rules of the tailing-dam seepage and contaminant transportation in the tailings is great significance to the prevention of groundwater pollution. According to the seepage theory and the conditions of steep valley, large elevation difference, and tilted aquifer, a hydrogeological generalized model of tailing-dam based on horizontal multilayer subdivision was established，while Visual Modflow (MT3DMS) was used to analyze the transportation characteristics of ammonia nitrogen in the groundwater in the study area. The results indicated that ammonia nitrogen migration direction was consistent with groundwater flow direction, and ammonia nitrogen concentration decreased with the increase of the migration distance.