Related by context. Frequent words. (Click for all words.) 54 longwall 50 MSHA 49 Sago Mine 48 coal seam 47 mine shaft 47 underground workings 46 stopes 45 adits 45 Darby Mine 44 stope 44 shaft 44 coal seams 44 mine 44 Mine Safety 44 Sago mine 43 vertical shaft 43 Crandall Canyon mine 43 Yuzhkuzbassugol 43 rock outcrop 43 adit 43 spokeswoman Amy Louviere 43 Raspadskaya mine 42 robot submarines 42 seafloor 42 mine workings 42 mines 42 wireline logs 42 trapped miners 41 coal mine 41 toolpath 41 longwall mining 41 Sago Baptist Church 41 Montcoal W.Va. 41 blowout preventers 41 Jeff Gillenwater 40 conveyer belts 40 Montcoal 40 dragline 40 Oconee Nuclear 40 Crandall Canyon Mine 40 roadbed 40 holes drilled 40 workpieces 40 outcropping 40 miners 40 wellbore 40 Sago miners 40 Massey Energy 40 Crandall Canyon 40 auger drilling 40 MSHA inspectors 39 drill rig 39 Sago 39 robotic submarines 39 blowout preventer 39 earth crust 39 ActiveMine 39 mineralized zone 39 Discoverer Enterprise 39 spokesman Bill Salvin 39 hydraulic jacks 39 coal mines 39 ventilation shafts 39 coffer dam 39 isomerization unit 39 cave ins 39 conveyer belt 39 ventilation shaft 39 Kleen Energy plant 38 sulphide ore 38 coke ovens 38 Lamaque 38 borehole 38 Jerritt Canyon 38 Sago mine disaster 38 casing 38 wellhead 38 tar mats 38 XRF 38 valley fills 38 Randal McCloy Jr. 38 conveyor 38 Global Surveyor 38 sulfide mineralization 38 coalmines 38 dewater 38 Wangjialing mine 38 Marcellus Shale wells 38 vents methane 38 underwater robot 38 drill holes 38 HUNTINGTON Utah 37 capping stack 37 workover rig 37 Escondida mine 37 underwater robots 37 W.Va. mine 37 shuttle thermal tiles 37 Kemerovo region 37 endoscopes 37 Aracoma