SU1765399A1 - Open cast mining method - Google Patents

Abstract

The invention relates to the mining industry and can be used in the open pit mining of mineral deposits. The invention makes it possible to increase the development efficiency by reducing the overburden ratio. The field is processed in two stages: the first stage is processed in the traditional way, the second stage forms the access-free working board of the quarry, which is processed by the sections formed by the cutting holes. 1 hp f-ly, 3 Il.

Description

WITH

with

The invention relates to the mining industry and can be used in open pit mining for mining deep quarry zones.

There is a method of opencast development of steeply dipping deposits, which includes highlighting the stages of mining, developing horizons in a descending order within the boundaries of the stage with the formation of the open pit mine, drilling and blasting of rocks for excavation and excavation of the mining equipment, moving congresses on the ledges , laying of transport communications on the horizons of the quarry with periodic re-laying of them, working out layers with the beginning of penetration of pioneer trenches between Proposition transport communications in E.

The disadvantage of the known method of development is the large extent of transport communications, a large surface of dust-forming contacts with the developed quarry space, a large amount of work on the opening and cutting of working horizons, a large number of auxiliary processes during excavation and transport works, low use of technological equipment at main works,

There is also known a method of opencast mining of steeply dipping mineral deposits, which includes horizontal ore mining and overburdening of ledges, transportation of rock mass by road and rail transport with the placement of railway stations and congresses on the off-board board of the open pit, working out the lower quarry horizons to the road conveyor until reaching the size of the horizon station, the formation of railway congresses in a stationary or temporary position, the refinement of the horizon in on rail transport.

 about ate

Ca

yu yu

A disadvantage of the known method of development is the large extent and complexity of transport communications, a large amount of work on opening and cutting of working horizons, a large amount of auxiliary processes in excavation and transport works, low use of mining transport equipment at main work, large areas of intra-career dust formation.

The purpose of the invention is to increase the efficiency of field development.

The goal is achieved by the method, which includes mining the pit in two stages, excavating and transporting the rock mass, after the first stage has been completed, the steps of the working side work to form an access-free side, which is separated from the massif by a cut-off slit and is divided into excavation blocks worked by drilling and blasting transverse layers with simultaneous lowering of the blocks. The blocks form a prism-like shape with an angle of inclination of 1-2 ° more than the angle of repose of the rock mass.

LF presents mining schemes for the first and second batch quarry; figure 2 - section aa in figure 1 (the scheme of mining rocks bestemped working board pit second stage); Fig. 3 is a diagram of drilling and blasting wells and shipment of debris from exploded rock layers. The method is carried out as follows.

The field is developed in two stages. First of all, a career is developed with drilling and blasting rocks with ledges. After working out the rocks of the first stage 1 in the second stage 2 of the pit, they form an access-free board 3 by triggering the ledges 4 rocks 5 of the second stage of the pit. The access-free board of the pit 3 is separated from the massif by a cut-out slit b and divided into excavation blocks with 7 slots 8. The rocks of the excavation block 6 are worked out in the lower part by transverse layers with their explosive wells

blasting wells to form rock mass 10 and simultaneously lowering the unbroken part 11 of the excavation block 7 with the help of gravity forces. The mountain mass of the collapse 10 from the blasted layer is shipped to the vehicle 12 by means of the loading means 13 and delivered to reception points. Then cycles of blasting a layer of rock, lowering the unexploded portion of the excavation block, shipping and

The delivery of the rock mass is repeated until the excavation unit is fully developed.

To provide conditions that exclude the possibility of hanging arrays of the downhole being developed on the slope

the pit’s uninterrupted bead, the block is formed into a prism-like shape with a tilt angle a 1-2 ° larger than the angle of repose of rocks in May.

Claims (2)

1. A method of open-pit mining, which includes quarrying with two lines, excavation and transportation of rock mass, characterized in that, in order to increase the efficiency of field development, after working off the first stage, the working side steps operate with the formation of an access-free side, which is separated from the array cutting off the slot and divided into blocks, drilling-blasting mining method transverse layers with simultaneous lowering blocks. 2. The method according to claim 1. Distinguishing feM that the blocks being processed form a prism shape with a slope angle of 1-2 ° greater than the angle of repose of the rock mass. ate O) D) in to r W 13 12 Fig.Z