SU1647138A1 - Method of reconstruction of deep open mines - Google Patents

Abstract

The invention relates to mining protémé and is intended to reconstruct predominantly stretched deep quarries. The purpose of the invention is to reduce costs at the initial stage of reconstruction by reducing the volume of overburden being removed and increasing the active mineral reserves in the subsequent reconstruction. The career field is divided into stages of development in depth, strike and across the strike. Extinguished ledges between adjacent stage contours will be reopened from the center to the flanks of the quarry in descending order. Initially, the re-entry of the benches is made to a length equal to the length of the ore body along the strike. The length of each subsequent gate is reduced and limited on the flanks of each working ledge to the formation of the pillars of the rock along a convex contour towards the developed space. The radius of curvature of the contour in the plan and the length of the flanking pillars along the adjacent reference contour are determined by the derived mathematical formulas. The center of the circle of the plane is oriented to the extent of the strike of the ore body. The flanks are repaired by a convex contour. 2 Il. C /) C

Description

The invention relates to the mining industry and can be used in the reconstruction of predominantly stretched deep quarries.

The purpose of the invention is to reduce costs at the initial stage of reconstruction by reducing the volume of overburden being removed.

FIG. 1 shows the career plan during the reconstruction period; figure 2 - section aa in figure 1.

The method is carried out as follows.

When mining a steeply falling ore body 1, stages 2–4 of the development with step-by-step contours 5 and 6 are identified. After

part of the overburden ledges are redeemed according to the stage contour 5, they start the reconstruction of the quarry. Depreservation is initiated in the contours of stage 3. The recessioned benches are worked up by stepping down the center to the flanks of the 7th open-pit mine in descending order. Initially, the re-activation of the ledges is not a length equal to the length of the ore body 1 along the strike. The mining front is moved across the ore body. The development of each subsequent step of the step is made with a reduced length relative to the previous step. A reduction in the length of the seedlings being worked is achieved in order. that on flag portions of the 8 ledges form bounding zeli J XI

with

00

ki rocks 9. And the pillars form a convex contour in the direction of the developed space.

The radius of curvature in terms of this convex contour for each step is determined by the formula

k42 + (Ј-A / +

+ (hctga + b) (h-1), where B is the length of the flanking pillars being formed on top of the adjacent stage circuit, m;

And - the width of the stage on top, m;

h is the height of the ledge;

a - angle of the slope of the ledge, hail;

b - width of the transport berm, m;

n is the order number of the step.

The centers of the circles, including the curvature of the convex contour, are conventionally located in vertical planes oriented across the strike of the ore body enclosed between these planes.

The flanks are repaired by a convex contour. The ledges redeemed in such a way form between adjacent stage contours. The length of the flanking pillars of rocks on top of the adjacent stage contour is formed by a length determined by the formula

(L-Imfn

(W TsN

(L-U.y -A2 + NstduU- (L - + Hct9y f

L-imtn

2A

.

where (min - the minimum length of the excavator unit, m;

H - the height of the temporarily non-working side, formed on an adjacent stage contour, m;

p is the angle of the slope of the temporarily non-working side, hail;

L is the length of the ore body along the strike.

Upon reaching the mining operations in the quarry, the depths of 10 stages 2 end the re-activation of the flanking pillars and form a temporary non-working board along the step-by-step circuit 6.

Claims (1)

The invention The method for the reconstruction of deep quarries, including the division of the career floor into stages of development by depth, about five 0 erasing and across the strike, the redevelopment of canceled ledges between adjacent step-by-step contours from the center to the flanks of the quarry in descending order, the formation of the goaf mineral reserves in the subsequent reconstruction, the initial re-activation of the ledges is produced by a length equal to the length of the ore body along the strike, the length of each subsequent the inlets reduce m on the flanks of each working ledge to the formation of the pillar of the rock along a contour convex toward the developed space with a radius of curvature in the plan defined by the formula five 0 five +. 2 -A + ,§one 4 A + (hctga + b) (h-1), where B is the length of the flanking pillars formed on top of the adjacent stage circuit, m; And - the width of the stage on top, m; h - ledge height, m; a - angle of the slope of the ledge, hail; b - width of the transport berm, m; n - order number of the ledge from top to bottom, the length of the flanking pillars along the adjacent stage contour is formed by the length determined by the formula 2A t-arj2 where 1min - the minimum length of the excavator unit, m; H - the height of the temporarily non-working side, formed on an adjacent stage contour, m; p is the angle of the slope of the temporarily non-working side, hail; L is the length of the ore body. Along the strike, m, and the location of the center of the circle of this curvature in a vertical plane oriented across the strike of the ore body, and the flanks are repaired on the convex contour on the flanks. at 1 Jdl 25