Acoustic Core Logging in Blast-damaged Rock.
Eng Geol Pub by Elsevier Sci Pub Company Amsterdam May 1976 1976 May; 10(1):13-36
The Bureau of Mines, in cooperation with the Duval Corp., conducted a blast-fragmentation experiment to determine the feasibility of preparing a porphyry copper-molybdenum deposit for in situ leaching. One of the major problems in the extraction methods and equipment applicable to core-logging equipment and methods were devised and used as one approach in solving this problem. The acoustic parameters indicated the deterioration in structural quality from the preblast condition, in which the rock was badly fractured and weathered, to the more highly fractured postblast condition. Because of the highly fragmented, poor structural condition of the rock after blasting, the rock was indicated to be suitable for in situ leaching in 20- and 15-foot blasthole spacings, and in some zones in the rock at 25-foot blasthole spacing.
Eng. Geol. Pub. by Elsevier Sci. Pub. Company, Amsterdam, May 1976, V. 10, No. 1, PP. 13-36