Massive sandstone in immediate roof delays the local fall in goaf of a – McqOptions

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1.	Massive sandstone in immediate roof delays the local fall in goaf of a coal mine. Under this condition, crushing of the pillars at outbye side is called
A.	coal bump
B.	overriding of pillars
C.	stiffening of pillars
D.	spalling of pillars
Answer» C. stiffening of pillars

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