Related by context. Frequent words. (Click for all words.) 51 coal 46 coal mining 44 Marcellus shale 44 bauxite 43 coalfields 42 mined 42 steelmaking 42 coal seams 42 Marcellus Shale 42 coal mines 41 lignite 41 mining 41 ore 41 prospectors 40 coking 40 shale 40 thermal coal 40 coking coal 39 manganese 39 coal miners 39 natural gas 39 metallurgical coal 39 limestone 39 Coal 39 Appalachia 38 colliery 38 steel mills 38 ores 38 uranium ore 38 Marcellus 37 coal miner 37 vanadium 37 mineral 37 coal seam 37 iron oxide 37 coal mine 37 northeastern Pennsylvania 37 uranium 36 cobalt 36 shale gas 36 Coal Mine 36 copper 36 iron ore 36 mines 36 slag 36 ferrochrome 36 smelting 36 minerals 36 potash 35 tungsten 35 furnaces 35 Bethlehem Steel 35 alumina 35 Powder River Basin 35 pig iron 35 coal seam gas 35 scrap metal 35 ferrous 34 gas 34 steel mill 34 miners 34 Pennsylvanian 34 shales 34 mother lode 34 soda ash 34 coal gasification 34 metallurgical 33 Northeastern Pennsylvania 33 chromite 33 sulfur 33 molybdenum 33 miner 33 steelworks 33 bitumen 33 coalbed methane 33 steelworkers 33 uranium oxide 33 gypsum 33 Rust Belt 33 Appalachian Basin 32 blast furnaces 32 zinc 32 Iron ore 32 thorium 32 oil sands 32 liquid fuels 32 Pennsylvania 32 mine 32 Luzerne County 32 Hazleton 32 Mineral 32 gold 32 nickel 32 tantalum 32 quarries 32 metallurgy 32 Wheeling Pitt 32 methane gas 32 hardscrabble 32 steel 32 Goldfields