Related by context. Frequent words. (Click for all words.) 63 longwall 50 coal mining 49 subsidence 48 MSHA 48 mining 47 coal seams 46 mountaintop mining 46 mountaintop removal 45 coal mine 45 coal seam 45 mountaintop removal mining 45 rockfall 44 dewatering 44 coal mines 44 fracking 44 mine 43 coal 43 coalmine 43 roadbed 43 Crandall Canyon 42 Sago Mine 42 colliery 41 mines 41 UMWA 40 mine shaft 40 quarry 40 coal miners 40 Mine Safety 40 timber harvesting 40 coalbed methane 40 Mining 39 CNX Gas 39 horizontal drilling 39 miners 39 quarrying 39 hydraulic fracturing 39 groundwater 39 Coal Mine 38 mineral sands 38 tailings 38 Crandall Canyon Mine 38 Coal 38 mine shafts 38 Bowen Basin 38 Consol 38 dam 38 dredging 38 timber harvest 38 miner 37 Mine 37 steelmaking 37 exploratory drilling 37 metallurgical coal 37 livestock grazing 37 excavation 37 DEP 37 coal seam gas 37 ore 37 sulfur dioxide emissions 37 drilling 37 floodplain 36 coal gasification 36 Powder River Basin 36 PennDOT 36 Marcellus shale 36 coal ash 36 coalfields 36 Sago 36 leaching 36 retaining walls 36 drillers 36 Clean Water Act 36 bed methane 36 mined 36 sinkholes 36 aquifer 36 cave ins 36 coking coal 36 Pilbara 35 seismic activity 35 smelting 35 coal miner 35 underground workings 35 Crandall Canyon mine 35 weir 35 alumina 35 Consol Energy 35 Massey Energy 35 silt 35 excavating 35 Marcellus Shale 35 Wheeling Pitt 35 UCG 35 manganese 35 uranium mining 35 geotechnical 35 Iluka 35 coking 34 acidification 34 gypsum 34 molybdenum