Rock Products

MAR 2019

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30 • ROCK products • March 2019 www.rockproducts.com T he problem of toes and elevated floors after a blast can be traced back centuries to when explosive were first used in mining. Why do they occur? What is commonly blamed as the cause of these toes is geology, but how does geology change that rapidly to where one shot has a fine floor and the next is elevated? A better approach than attempting to blame factors out of the blasters control is to solve these toe problems and reduc- ing excess blasting, uneven floors and possibly mechanical removal by following a systematic approach to identifying what is causing the toe. In most cases the toe is not caused by geologic conditions, but instead is a direct cause of the explosive product, pattern design or drilling inconsistencies. Furthermore, if a geologic condition is causing this issue it should not simply be writ- ten off as a given that the toe must occur; a good blaster or engineer will quickly modify the blast pattern to account for the geologic change and eliminate this problem. After eliminating the rare case of geologic conditions, the Controlling the Floor Controlling the Floor Using Modern Blasting Techniques to Solve the Problem of Toes and Elevated Floors After a Blast. By Anthony Konya and Calvin J. Konya

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