Inappropriate management of coal mine overburden (OB) dumps creates environmental hazards. In many countries, high concentration of Mn was observed in groundwater near the coal mine OB dump sites. Comparatively new coal mines in Barjora coalfield were chosen in this study to assess the impact of OB dumps in groundwater. Acid Digestion (AD), Toxicity Characteristics Leaching Procedure (TCLP) and Batch Leaching Test (BLT) were performed to estimate Mn concentration in OB dumps and its leaching behaviour. Shale present in OB dump has potential to leach high concentration of Mn. The aquifer in this region is mainly unconfined type and water table is very shallow. In situ soil is characterized by 44.3% sand, 37.5% silt and 18.2% clay with a saturated hydraulic conductivity of 5.58 cm/day. Column study and HYDRUS 1D numerical modelling were used to simulate the migration of Mn in vadose zone. Subsurface soil does not possess appreciable attenuating potential to retard the transport of Mn in vadose zone. HYDRUS 1D model explains that 1.6 m thick soil profile of the study area may release Mn in groundwater after 11^th year and it can attain the complete breakthrough at 17^th year. A groundwater contaminant transport model based on available hydrogeological data has been developed using VISUAL MODFLOW 2009.1 software. The movement of Mn in aquifer has been determined using MT3DMS code. It indicates ≃ 8 km² area around the two Open Cast Coal Mines (OCCMs) namely OCCM 1 and OCCM 2 may suffer groundwater contamination of Mn by 2050.

煤矿覆盖层（OB）堆放场的管理不当会造成环境危害。在许多国家中，在煤矿OB垃圾场附近的地下水中发现了高浓度的Mn。在这项研究中，选择了Barjora煤田中相对较新的煤矿来评估OB排泄物对地下水的影响。进行了酸消化（AD），毒性特征浸出程序（TCLP）和分批浸出试验（BLT），以估算OB堆中的Mn浓度及其浸出行为。OB转储中存在的页岩可能会浸出高浓度的Mn。该地区的含水层主要为无限制类型，地下水位很浅。原位土壤的特征是44.3％的沙子，37.5％的淤泥和18.2％的粘土，饱和水力传导率为5.58厘米/天。通过柱研究和HYDRUS 1D数值模拟来模拟锰在渗流区的迁移。地下土壤没有明显的衰减潜能，无法阻止锰在渗流区的传输。HYDRUS 1D模型解释说，研究区的1.6 m厚土壤剖面可能在11点后释放地下水中的Mn。^个年，它可以在17达到完全突破^日的一年。已使用VISUAL MODFLOW 2009.1软件开发了基于可用水文地质数据的地下水污染物运移模型。Mn在含水层中的移动已使用MT3DMS代码确定。这表明，到2050年，两个露天煤矿（OCCM 1和OCCM 2）周围≃8 km ^2的区域可能受到锰的地下水污染。