HotShot ® Induces Breakthrough In Cave Propagation ELECTRONIC DETONATION AT WORK In 2005, Harmony Gold’s Mount Marion underground gold mine commenced stoping in the mine’s western zone, using the longitudinal sub-level caving method for production. But after six months of stoping, production had not progressed as the unsupported span was too small to induce caving. Blasting with pyrotechnic detonators was not an option du

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