spec - stat
- splines
- splint
- splint coal
- splinter
- split
- split a pillar
- split beam
- split case
- split coupling
- split flow
- split pin
- split sprockets
- split ventilation
- split-second blasting
- split-wedge roof bolt
- splitting
- splitting board
- spoil
- spoil area
- spoil bank
- spoil dump
- spoil heap
- spoil heap edge
- spoil pile
- spoil-bank conveyor
- spoil-heap formation system
- spoil-heap incline
- spoil-heap operation
- spoil-heap rail-track
- spoil-pile bank
- sponge
- sponginess
- spontaneous
- spontaneous combustion
- spontaneous combustion coal
- spontaneous fire
- spontaneous gas emission
- spontaneous ignition
- spool-and-sleeve
- spoon bit
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