SU985289A1 - Method of open-cast mining of gently sloping and sloping mineral deposit - Google Patents

Description

The invention relates to the mining of the V industry and can be used in the open-pit development of inclined and deep-falling mineral deposits.

There is a method of opencast development of sloping and steeply mineral deposits, including the development of overburden and mineral in the direction of a fall of a deposit, with external dumping at a side tilt angle in the recumbent side of the field calculated for the full design depth of the open-pit mine tl 3 the contours of the quarry and large areas occupied by external dumps.

There is also known a method for the open development of inclined and steep deposits of minerals, which includes mining the pit with longitudinal treads with external oval formation in the first order and transverse treads with internal dumping in the second stage t2.

However, this method is inefficient at a depth of development of more than ISO m, the performance decreases sharply

equipment due to constrained working conditions, difficulty in draining, transportation, etc.,

The purpose of the invention is to reduce the costs of vskrilinnye work in the second stage by increasing the marginal angle of slope of the sides.

The delivered chain is achieved by

to what fe method of opencast mining, clone and steeply dipping deposits of minerals, including the mining of the quarry by longitudinal tools with external formation in the first

IS queues and transverse windings with internal dumping in the second turn, at the bottom of the first open-pit mine, spread the prism from the overburden rocks, and during the second excavation

Twenty queues of the rock of the prism are moved to the front of the mining front as the quarry is mined.

Simultaneously with the development of the second stage of the pit, the external dumps of the first

25 queues are moved to internal dumps.

D.1 shows the scheme of the proposed cnocoQa in Fig. 2 - section A-A in d. 1) in Fig. 3 is a section BB;

30 in FIG.

The method is carried out as follows.

Initially, the development of overburden and minerals is carried out by longitudinal stopping to horizon level 1 with removal of overburden at constant 5 or temporary external dumps. If necessary, increasing the stability of the bead in the weakened areas, place the prism 2 at the bottom of the open pit to create conditions for clamping the potential prism of possible breaking in its upper part bounded by surface 3. The angle of the bead 4 to horizon 1 is determined by known methods } 5 by the coefficient of safety, depending on the lithological composition of rocks. Then, the overburden operations and the development of mineral 5 are transversely driven by q q transportation of overburden rock to the internal blade 7, and the bottom of the blade is formed from stronger pores & d, thanks to which the blade slope acquires a convex profile 8. Under the usual 25 conditions when there is no need for the extension prism 2, sliding exits are arranged only below horizon 1. From horizon 1 to the surface, the mineral is delivered, Q using the developed space of the first stage.

In order to less strip the non-working side 9 in the recumbent side of the field, the development is carried out with high ledges 10 (for example, 20 m) and the width of the working sites. 11 accepts minimum required, especially in the lower horizons. In this case, the working side will have a steep angle or a convex profile.

The angle of inclination of the second turn of the pit is calculated at a value of the stability coefficient equal to 1 according to the excess characteristics of the rocks. Depending on these characteristics 45

the board as a whole may have a convex or flat profile.

The advantages of the proposed method are that by increasing the angle of inclination of the non-working side in the recumbent side of the field by several degrees (an average of 5-6), reduce the amount of overburden in the marginal contours of the quarry and preserve the area adjacent to the pit wall, reduce the area under external landfills, the delivery of the restored land to the land user is accelerated.

Claims (2)

1. An opencast mining method for inclined and steep mineral deposits, including the treatment of the pit with longitudinal penetrations with external dumping in the first turn and lateral penetrations with internal dumping in the second turn, characterized in that, in order to reduce costs for stripping work in the second stage by increasing the limit value. the angle of slope of the sides, at the bottom of the quarry of the first stage, pour the prism from the rocks above the rock, and when the second stage of the rock is dredged, the spacer prisms are moved ahead of the rock front as the quarry progresses. 2. POP.1 method, differing in the fact that. Simultaneously with the development of the second stage of the career, the external dumps of the first stage will be mixed into the internal dumps. Sources of information taken into account in the examination 1.Rzhevsky V.V. Technologists and complex mechanization of open pit mining. M., Nedra, 1980, p. 91. 2.Rzhevsky V.V. Technologists and complex mechanization of open pit mining. M., Nedra, 1980, p. 329.