E/MJ operating handbook of mineral underground mining

E/MJ operating handbook of mineral underground mining

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of Cordtex detonating cord and 65 nonelectric detonators, as well as 8, 700 L- series electric detonators (see table). ... In this concept, expansion boxes are opened in the pillar to allow the pillar ore to be mass-fired from sublevels into the boxes. ... (ms) 150 Blast duration (ms delays) 1, 500 Electrical delays (ms) 200 Total 1, 700 Total number of circuits 147 Average ... as a stope gets higher, drilling generally is switched to flat-backing using handheld Holman Silver 3 rock drills on airlegs.

Title:E/MJ operating handbook of mineral underground mining
Author: Robert Sisselman
Publisher: - 1978

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