房采采空区
Gob Left by Room and Pillar Mining
采空区
excavated-empty area
excavated-empty-area
Stopes
Mind-out Area
gob
mined-out areas
mined region
goaf area
vacant place
Coal mine gap
Excavation area
Mine-out Area
mined out region
mining cavities
guag
gwag
mining goaf area
Cavity
Empty mine area
integrated geophysical exploration
Worked out zone
ground electricity cross section image
mining exvacations area
Mining-out Area
working out area
GOAF
golf
underground mined caves
coal-goaf
Mined-out Zone
worked-out area
mined out space
empty mining area
coal mine gob
underground goaf
mine goaf
Waste
finished stope
mined area
stoped out area
stoped area
Ined-out area
excavated region in coal mine
coal mined area
Mined-area
abandoned coal area
gob area
Reconnaissance
stoped out workings
work-out area
mining caves
mined out area
exhausted area
abandoned stope
Mined-out Region
empty area
mined zone
mined-out area
Cavities
Mined-out stope
mined up panel
Hollow out Section
mining out area
mined - out area (gob
Mining-out region
Waste area
Stope
emptied stopes
Worked-out section
mine out area
geologic subsidence
emptied area
mined gob
Mining area
coal mine goaf
waste cave
abandoned workings
Goal
gobi area
采空区边坡
The Slopes of Empty Mine Area
采空区残煤
liptobiolite coal in goaf
采空区处理
gob treatment
Mined-out area disposal
goaf management
Mined-out area treatment
Abandoned stope treatment
goaf disposal
disposal of emptied stope
采空区地面塌陷
picks depletion region fall of ground