Patent EA-000562-B1 (EA)
Title: R.b. jun method of open-pit mining
IPC: E21C41/26
Filed: 1999-02-04
Abstract: 1. A method of openwork mining of deposits providing the breaking-out of the main reserves by blasting descending holes (2) from the surface of steps and transporting the rock mass to the surface, characterized in that the working out of reserves of levels being carried out with forming a vertical or close to vertical, slope of one from flanks (4) of an open cut within said level, for that, a safety prism (5) being formed near a contour thereof, breaking out said prism being carried out at me final stage of works on me level (1), and rocks beyond the open cat's contour located within a probable displacement zone of the open cut's flank (4) are being reinforced by injecting binding (fixing) grouts through holes (10) or/and by installing prestressed anchors (8). 2. The method according to Claim 1 characterized in that main reserves of said level are being worked out with self-propelled machinery being involved, using remote control equipment for working out safety prisms, and resources thereof are extracted by selective methods. 3. The method according to Claim 1 characterized in that rocks beyond the open cut's contour located within a zone of probable displacement of the open cut's flank are being reinforced by separate portions located discretely. 4. The method according to Claim 1 characterized in that a zone of reinforced rocks beyond the open cut's contour (reinforcing belt 7) is being formed by a continuity on the entire surface of possible displacement of the open cut's flank. 5. The method according to Claim 1 characterized in that a near-contour mass (6) of a slope of a vertical flank is being additionally reinforced by the way of preliminary injecting binding grout and/or by installing anchors (8). 6. The method according to Claim 1, characterized in that slopes of a steep flank (4) are being formed as vertical or close to vertical. 7. The method according to Claim 1, characterized in that injecting into rock is being carried out by forcing grouts through holes (10) drilled through the body of satety prisms (5). 8. The method according to Claim 1, characterized in that ends of steel ropes (9) are being additionally monolithed at various depths in rock beyond the open cut's contour, said ropes being located on the earth surface and being anchored beyond a displacement zone. 9. The method according to Claim 1, characterized in that drilling out safety prisms (5) being carried out by horizontal or ascending holes (19, 20). 10. The method according to Claim 1, characterized in that mine workings are being run in the body of prisms (5) on the levels, drilling out of said prisms is being carried out from said workings, as well carrying out works for reinforcing rocks of a zone of probable displacement of the open cut's flank. 11. The method according to Claim 1, characterized in that reinforcing rocks of a zone of probable displacement of the open cut's flank (reinforcing belt 7) being carried out by injecting binding grouts through vertical or curve holes (11,12) drilled from the surface. 12. The method according to Claim 1 characterized in that a safety bench (22) of an operational flank is being formed for several levels (1).