Pillar design methods for longwall mining

Author:	Mark, Christopher.
Year:	1990
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:
Series:	Information circular / Bureau of Mines ;
Report Number:	9247
Subjects:	Longwall mining
	Pillaring (Mining)
Link:	https://hdl.handle.net/2027/mdp.39015078458406