Related by context. Frequent words. (Click for all words.) 77 shafts 63 mine shaft 55 flange 52 trench 51 cavity 49 conveyor 48 adit 48 mine 48 pulley 48 rotor 48 Shaft 47 trapped miners 47 elevator shaft 47 underground workings 46 winch 46 hydraulic 46 auger 46 valve 46 wellbore 46 diaphragm 46 mine shafts 46 nozzle 46 clubhead 45 hole 45 bushings 45 duct 45 borehole 45 girder 44 tunnel 44 cavern 44 coal seam 44 pipe 43 girders 43 sump 43 downhole 43 tubing 43 piston 43 casing 43 manhole 43 crankshaft 43 clubface 43 housings 43 slope 42 crevice 42 coil 42 radiator 42 ductwork 42 chimney 42 orebody 42 tines 42 truss 42 underground 42 rear wheel 42 tube 42 machined 41 roadbed 41 steering column 41 driveshaft 41 tunnels 41 engine compartment 41 mm diameter 41 cylindrical 41 graphite 41 rear axle 41 combustion chamber 41 holes drilled 41 longwall 41 flume 41 capsule 41 crane 41 chute 41 valves 41 steel rods 41 Mine 41 spindle 41 shear 40 ducting 40 horizontal 40 manhole cover 40 injector 40 dozer 40 Crandall Canyon Mine 40 footwall 40 drilled 40 drill holes 40 weld 40 blade 40 excavator 40 welded 40 undercarriage 40 drill rig 40 chutes 40 exhaust pipe 40 compartment 39 coal mine 39 fastener 39 steep slope 39 roof 39 knob 39 miners 39 diameter