Related terms:
longwall mining
mining methods
roof supports
longwall
shaft mining
retreat mining
modern mining
cut and fill
rock together
world coal production
mine roof
coal preparation
largest coal
conveyors
stopes
deep underground
black lung
tons of coal
loaded onto
chocks
ground support
steeply
shotcrete
coal seam
underground mining
blasted
Wikipedia sources:
Coal mining
Room and pillar
Underground mining (soft rock)
Longwall mining
Underground mining (hard rock)
Context for words:
room
and
pillar
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