bench method with core soil and temporary invert
enlarged-arch-foot bench method
top heading and bench method
caving method without sill pillar
fully-mechanized caving method
multi slicing-and-caving method
Non pillar sublevel caving method
non-pillar caving method
Non-pillar sublevel caving method
non-sill pillar little segment caving method
Pillarless sublevel caving method