Safety rationale for composite ore deposits underground mining in energy distributed masses

Abstract

Introduction. Composite ore deposits development in energy-disturbed masses is currently characterized by reduced ore areas, lower metal content in ore, deteriorated mining-geological and mining conditions, as well as stringent requirements for human safety in mining facilities influence zone. Research objective is to develop safety rationale for composite ore deposits underground mining, taking into account the geomechanical state of energy disturbed masses based on graph-analytical calculation methods for stable parameters of enclosing rock outcrop and filling material in during processing. Methods of research. A systematic approach was used, which contains an outcome analysis of research, development and design of new technologies and technical means that ensure the rational use and protection of subsoil, environment and population, taking into account advanced instrumental, geological, mine surveying and geomechanical support for standard and new methods. Results. A graphic-analytical method (nomograms and calculation formulas) is recommended to justify safe parameters of chambers based on the results of multi-year research during composite ore deposits underground development and depending on the rock mass properties. Safe parameters are determined from experience for a highly, moderately and sparsely jointed rock mass with horizontal outcrop. The Instruction on the Geomechanical Rationale for Safe Mining at GP VostGOK Mines, Ukraine, was also compiled. This will make it possible to improve mining and environmental safety of operations at the deposits of the Russian Federation, the Republic of Kazakhstan, Ukraine and other developed mining countries of the world.