R.B. Jun's method of openwork mining utilizing pit wall consolidation
First Claim
1. A method of openwork mining of deposits providing the breaking-out of the main reserves by blasting descending holes from the surface of steps and transporting the rock mass to the surface, wherein the working out of reserves of levels being carried out with forming a vertical or close to vertical, slope of one from flanks of an open cut within said level, for that, a safety prism being formed near a contour thereof, breaking out said prism being carried out at the final stage of works on the level, and rocks beyond the open cut'"'"'s contour located within a probable displacement zone of the open cut'"'"'s flank are being reinforced by injecting binding grouts through holes.
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Abstract
The invention relates to the mining industry and can be used for working out mineral deposits, no matter what their thickness and dip angle are, and allows to reduce the volumes of overburden operations. The invention provides the working out the main reserves by openworks, with forming safety benches (22) on steps of an open cut. From the top view, reserves of each level (1) are being worked out by blasting descending holes in direction to working flank of an open cut with forming safety prisms near a designed contour thereof. The breaking out of safety prisms (5) is being carried out at the final stage of works on the level (1) with forming a vertical or close to vertical, slope within the level. Rocks of near-contour mass (6) in a zone of probable displacement of rocks being reinforced by injecting and/or installing prestressed anchors (8).
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Citations
16 Claims
- 1. A method of openwork mining of deposits providing the breaking-out of the main reserves by blasting descending holes from the surface of steps and transporting the rock mass to the surface, wherein the working out of reserves of levels being carried out with forming a vertical or close to vertical, slope of one from flanks of an open cut within said level, for that, a safety prism being formed near a contour thereof, breaking out said prism being carried out at the final stage of works on the level, and rocks beyond the open cut'"'"'s contour located within a probable displacement zone of the open cut'"'"'s flank are being reinforced by injecting binding grouts through holes.
Specification