METHOD OF DEVELOPMENT OF POWERFUL STEEPLY DIPPING DEPOSITS OF UNSTABLE ORES Russian patent published in 2014 - IPC E21C41/22 E21D11/00 

FIELD: mining.

SUBSTANCE: method of development of powerful steeply dipping deposits of unstable ores consists of separating the ore body to the floors, and the floors - to the horizontal or gently sloping layers developed in descending order, removal of the ore within the layers with splits, stowing with the hardening materials, drifting of the splits of the second and subsequent layers under the stowing array. When drifting of the splits of the second and subsequent layers under the stowing array with keeping ahead the bottomhole of the split in its sides, represented by unstable ore array, at an angle to the longitudinal axis of the split the holes are drilled. Through the holes while they are ahead of the bottomhole of the split the bonding composition is injected in the rock mass. At that the distance between the holes is taken equal to twice the depth of penetration into the ore array in the vicinity of the hole of the bonding composition, and the length of the holes is determined using the expression.

EFFECT: improving the safety of mining operations, increase in the rate of penetration of the split and improving the quality of stowing operations.

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