Kimberly method of block-caving using slusher drifts

Author:	Richards, John A.
Year:	1940
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7135
Series:	Information Circular / Bureau of Mines ;
Report Number:	7135
Subjects:	Caving mining
	Mining engineering--Costs
Link:	https://hdl.handle.net/2027/mdp.39015078534404