METHOD OF OPENED DEVELOPMENT OF LONG STEEP DIPPING FIELDS WITH INTERNAL DUMPING Russian patent published in 2015 - IPC E21C41/26 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to open development of mineral fields, more exactly to open development of the long steep dipping fields with internal dumping. Method when borrow pit length is divided to turns, from them first turn is developed to design depth with external dumping, and second turn is developed using internal dumping, locating overburden to the developed space of the first turn with common formation of the dumping tiers with progress of mining towards end through full depth. At that the work zone through height is divided to two parts, bottom part opening and development are performed by longitudinal inclined layers with lifting 20-25% towards end using the wheel loaders and vehicles able to move over these steep grades, height of the bottom part is determined as per mathematical equation. The top part of the work zone is developed using the transverse development system and sliding access tracks, their width is accepted based on the condition of their use for dumping of the exploded rocks upon their widening and simultaneous assurance of two-way passage of vehicles ensuring the cargo movement between the bottom and top shelves, the longitudinal inclined layers of the bottom part of the work zone are developed by separate formed in series from top to bottom near-vertical-horizontal layers with maximum height, determined considering trajectory of the loader bucket movement, during development of each successive near-vertical-horizontal layer the rocks are preliminary loosened, the loader excavates it and loaded in vehicles located at horizontal sites at minimum distance to the mine working.

EFFECT: technical result is decreased additional sides spacing to arrange the opening mine working, and reduced distance of overburden transportation from the work zone of the borrow pit to the internal dumping.

2 dwg