Related by context. Frequent words. (Click for all words.) 60 tailings 58 mine tailings 57 treated effluent 57 retention basins 56 mill tailings 56 groundwater 56 wellfield 56 effluent 55 underground aquifer 55 aquifer 55 aquifers 55 polluted groundwater 55 leach pads 54 underground aquifers 54 heap leach pad 54 dewatering 54 dredged material 53 contaminating groundwater 53 sediment 53 basin 52 basins 52 lagoons 52 dissolved solids 52 fly ash 52 silt 52 dredge spoils 52 Tailings 51 clarifiers 51 bio solids 51 flue gases 51 tailings disposal 51 groundwater basin 51 brine 50 groundwater pumping 50 tailings pond 50 drainage basins 50 contaminated soils 50 livestock manure 50 detention basins 50 retention ponds 50 salt domes 50 woody debris 50 topsoil 49 outfall pipe 49 biosolids 49 groundwater recharge 49 soils 49 contaminated groundwater 49 reinjection 49 landfill 49 impoundments 49 ponds 49 reservoirs 49 absorbent booms 49 effluent discharge 49 absorbents 49 leachate 49 contaminated soil 49 gravel extraction 49 contaminated sediments 48 ash ponds 48 alluvium 48 streambeds 48 slurry 48 drainages 48 wastewater discharges 48 sediments 48 heap leach operation 48 gravels 48 leach pad 48 brines 48 dewater 48 wastewater treatment 48 headworks 48 Sanitary Landfill 48 wastewater 48 gravel pits 47 sewage lagoon 47 injection wells 47 dewatered 47 heap leach 47 chlorides 47 salt caverns 47 leaching 47 sumps 47 Effluent 47 sulfide 47 landfills 47 greywater 47 activated sludge 47 Sediments 47 soil conditioner 47 lignite coal 47 potable 47 reservoir 46 stockpiled ore 46 watercourse 46 outfalls 46 water 46 clarifier 46 alkali