METHOD FOR DEVELOPMENT OF ORE BODIES IN ZONES OF ORE CONTACT AND OVERBURDEN BY SUBBENCHES Russian patent published in 2010 - IPC E21C41/26 

FIELD: mining.

SUBSTANCE: invention relates to mining industry and may be used in development of mineral deposits by open method. Method includes separation of payout bed in zones of contact into subbenches with height that depends on angle of ore body inclination, its thickness, and development from drilling of wells at the side of lying wall of deposit at the distance from contact along horizontal line, corresponding to minimum area of shed triangle of ore, and further two layers of wells as bench is separated into two subbenches with angle of ore body drop of 25-30° are drilled with depth with slight subdrilling of contact surface, and the last row of wells on the side of lying wall of deposit is drilled with depth for the whole height of bench with required subdrilling to minimise area of ore triangle included into ore mass. And at the side of hanging wall of deposit such area of ore triangle is achieved by laying a trench from the side of hanging wall with depth that corresponds to height of upper subbench, and after its tunneling lower payout bed for minimisation of ore losses is developed by drilling of the first and second row wells by ore from the side of hanging wall of deposit, and diluted ore mass after drilling and explosion of walls in the 3^rd and 4^th rows in zone of trench bottom is removed and stacked into dump of noncommercial ores. As angle of deposit inclination increases up to 40-45°, operations of bench height division into subbenches and trench arrangement by drilling of wells on the side of lying wall, and then hanging wall, are repeated, besides in case it is impossible to arrange a trench on the side of hanging wall, the first row of wells on the side of hanging wall of deposit is drilled near contact of ore with rock in development of ore in layer of the first subbench, and after its explosion and removal the 2^nd and 3^rd rows are drilled in overburden rocks, and after explosion and removal of rock, wells are drilled in payout bed of the 2^nd, 3^rd subbenches so that a common slope of bench could be arranged for its whole height.

EFFECT: reduction of ore losses and its dilution 2-3 times.

1 ex, 7 dwg