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Fullymechanizedcoalmining(FMM)withSub-levelcavingwasfirstexperimentedintheormerUSSRandFranceinthe1960sand1970s.Inthelate70s,thetechnologywaspopularizedinsomeEastemEuropeancountriesattractingwideattention.Howeverduetoanumberoffactors,nofurtherutilizationan
Fullymechanizedcoalmining (FMM) with Sub-levelcavingwasfirstexperimentedintheormerUSSRandFranceinthe1960sand1970s.Inthelate70s, thetechnologywaspopularizedinsomeEastEuropeancountriesattractingwideattention.Howeverduetoanumberoffactors, nofurtherutilizationan