积水采空区
mine water mined-out area
富水采空区
cavern with water coursed by mining
富家坞采空区
mined areas in Fujiawu pit
房采采空区
Gob Left by Room and Pillar Mining
独立采空区
Independent mined-out area
地下多层复杂采空区
underground multilayer complex goaf
地下采空区
underground mined-out area
Mind-out Area
Underground mined area
abandoned working
underground mining cavities
mined area
大尺度采空区
large scale mined-out area
large scale mined-out area LSMA
large scale mined-out area(LSMA
充填采空区
Fill the dead zones in mining