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Journal of Mining Sciences

2014 year, number 6

Improvement of Bottom Structure of Ore Horizon in Ore Drawing Using Load-Haul-Dumpers

I. V. SOKOLOV, A. A. SMIRNOV, YU. G. ANTIPIN, K. V. BARANOVSKY
Institute of Mining, Ural Branch, Russian Academy of Sciences, ul. Mamina-Sibiryaka 58, Ekaterinburg, 620219 Russia
Keywords: ore drawing and handling, trench bottom, load–haul–dumpers

Abstract

High-rate ore drawing with a single drawpoint requires stable structure of the horizon bottom in block caving of ore. Application of load–haul–dumpers conditions longer spacing of drawpoints, which worsens quality of ore drawing under caved rock. Adequate structures of trench bottoms of ore drawing levels are developed for LHD. To define mutual influence of the drawpoints, relations are set between the limit spacing of drawpoints along the length of the trench and the height of the caved level.