Related by context. Frequent words. (Click for all words.) 73 coal seam 62 shales 58 shale formations 57 shale 56 shale deposits 56 sandstones 56 mineable 56 coalbed methane 56 coal 55 bituminous coal 54 geological formations 54 dolomite 53 mineralized zones 53 coal mines 53 coal seam gas 53 Marcellus Shale formation 52 lodes 52 Bakken formation 52 Surat Basin 52 sulphides 52 mine workings 51 sedimentary rocks 51 shale gas 51 wells drilled 51 aquifers 51 outcrops 51 stopes 51 uranium mineralization 51 coal mining 51 earth crust 50 underground workings 50 horizontal drilling 50 coalmines 50 stratigraphic 50 horizontal wells 50 CBM 50 saprolite 50 geologically 50 gabbro 49 lithologies 49 bed methane 49 quartz veins 49 Marcellus shale 49 oxide mineralization 49 nickel sulphide 49 wells 49 geochemical anomalies 49 shear zones 49 magnetite 49 lignite 49 placer gold 49 coalfields 49 coalfield 48 stratigraphy 48 basins 48 hydrocarbon bearing 48 adits 48 thermal coal 48 sedimentary rock 48 copper mineralization 48 hydrocarbons 48 rock formations 48 sulphide 48 grade intercepts 48 Coal Bed Methane 48 coal mine 48 methane 48 overlying 48 breccias 48 gas condensate 48 gas hydrates 48 shallow depths 48 Woodford Shale 48 outcrop 48 Powder River Basin 48 mine shafts 48 mines 48 mineralized intercepts 48 undrilled 47 unconformity 47 quartz vein 47 mineralization 47 sedimentary 47 andesite 47 wellbore 47 pegmatites 47 Earth crust 47 orebody 47 longwall mining 47 sandstone 47 lode 47 schist 47 kimberlite 47 ultramafic 47 drillholes 47 hydrothermal alteration 47 mineralized 47 intrusive rocks 47 footwall 47 geophysical targets 47 reservoirs