DEVELOPMENT METHOD OF MINERAL RESOURCES AT MINIMUM LOSSES AND MAXIMUM MINE SAFETY Russian patent published in 2011 - IPC E21C41/00 

FIELD: mining.

SUBSTANCE: during implementation of the method there maintained is steady state of worked-out area with inter-chamber support pillars or with stowing of worked-out area, which is equivalent to the above pillars; at that, support pillars of various size are left or stowing of adjacent chambers with stowing mixture of various density is used in addition. Sizes of inter-chamber pillars and density of stowing is determined so that beds of mine rocks above worked-out area can bend with their convexity upwards and can work like natural arches; at that, pillar with loading degree of not more than C=0.25 is left in the centre of worked-out area, and pillar with loading degree of C=0.6 is left at the boundary of the above area. Loading degree of pillars is increased gradually from centre of the worked-out area to periphery, thus controlling the loading degree of pillars with their sizes and/or fullness and density of the used stowing.

EFFECT: losses of mineral resources are decreased and mine safety is increased.

3 dwg