Abstract
One of the important issues in upland quarries with the gravitational method of transferring the rock mass is to establish the rational angle of inclination of the ore roll depending on the humidity and size of the rock pieces. The article presents the results of model studies to determine the value of the external angle of friction between the ore roll and rocks of different moisture content and lumpiness. A nomogram has been developed to determine the flight range of rock pieces depending on the length and repose angle of the ore roll model.
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