SU1532705A1 - Method of mining mineral deposits - Google Patents

Abstract

The invention relates to the mining industry and can be used for underground excavation of irregularly shaped rod-like powerful ore bodies that do not have access to the surface. The goal is to increase the completeness and quality of extraction of ore from the depths when developing rod-like ore bodies. The ore is removed (P) by chambers (K) in several bursts with a successive decrease in mining operations. After the excavation of P in K of the first stage of the upper substage, the roof of the ore body is drilled with wells under the compulsory collapse of overburden and contour of natural equilibrium is formed, and inside this arch form a large-block structure for self-destruction of rocks. Simultaneous blasting of explosive charges in the wells forms a safety cushion of forcibly collapsed and self-breaking rocks. In this case, a set of natural equilibrium contour directional camouflet blasting. The recess P from K of the subsequent queues is carried out with a by-pass of the formed cushion following the lowering of the mining operations. 2 Il.

Description

the first stage, a trapezoidal cross-section of the form, and the camera of the second (and subsequent lines) diamond-shaped in cross-section form. In chambers 3, cut-off workings (not shown) pass through and layer-by-layer ore is blown down by fans of wells 5 and end-face release to borehole mines 2 using self-propelled loading and delivery equipment. The camera k performs the role between the chamber supporting pillars. After excavation of chambers 3 of the first stage and relaxation of the mining pressure from the drill drifts 6, wells 7 are drilled to force the roof rocks 8 to collapse. The height of the ho6-p overburden to be collapsed in the roof 8 is determined from the condition that the ore scattering does not break 4 by the ratio

l - YG - 1.35

where hnn is the minimum required

thickness of the safety cushion, m

This condition eliminates the casting of ore into the goaf. In order to fully fill the developed space of chambers 3 of the first stage of the height of the layer of overlying rocks of Lo5- to be collapsed, it must be determined from the formula. Ki on (gr o, 7 where hn is the height of the first substage, m;

К „- ore extraction coefficient Simultaneously with the wells 7 of the drill hole 9 along the contour 10 of the set of natural equilibrium. The height of the tent of the contour 10 in the roof is determined from the condition

.ctg (flJ / 2),

where B is the width of the ore body (hall

zh), m;

ot is the angle at the top of the set of natural equilibrium, hail. This angle is o (for rocks, it can be determined from the condition

o ("arctg K, where K is the fortress of rocks by

Protod Konovu.

1 Simultaneously with wells 7.9, bore holes And inside the contour 10 of the body of natural equilibrium to form a large block structure of the rock mass for self-breaking from the internal space 12 con

s 0

five

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five

five

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tour 10. Wells can be used to collapse overlying rocks from the roof 8, as well as being remelted, partially, into space 12, to form a large-block structure of the rock mass under self-destruction within circuit 10,

The blasting of wells 7, 9 and 11 is also carried out simultaneously, thus achieving the formation of a safety cushion 13 of rocks 14 forcedly collapsed into chambers 3 and large blocks 15 of rocks from self-crushing rocks of space 12 of contour 10. The trapezoid shape of chambers 3 contributes to their complete filling. forcibly collapsed rock 1, and also contributes to an increase in the volume of extraction of pure ore from chambers 3 of the first substage. Under the safety cushion 13, in the chambers 4 of the second stage, layer-by-layer ore blasting by fans of wells 5 and frontal production of broken ore 16 from chambers 4 to the dredging mines 2 of the second sub-floor are performed using self-propelled handling equipment. As the broken ore 16 is released from the chambers, the safety cushion 13 is bypassed after the clearing of the recess. Chambers of the subsequent lines of the excavation work in a similar way.

invention formula

A method for developing mineral deposits, which includes sinking preparatory-rifled workings, breaking down the ore massif and making ore from the chambers of the first stage, forcibly collapsing overburden with full filling of the developed space, dredging the ore from the chambers of subsequent bursts under collapsed overburden, characterized in that in order to increase the completeness and quality of ore extraction from the subsoil when developing stockpile ore bodies, simultaneously with the forced collapse of overlying od directed kamufletnym blasting contoured arch and natural equilibrium within said arch structure is formed by caving krupnoblochnogo rocks from forcibly collapsed and samoobrushivshihs rocks form predohraD

fig 2

Claims (1)

claims A method of developing mineral deposits, including the excavation of pre-cut workings, breaking the ore mass and face mining of ore from the first stage chambers, forced collapse of the overburden with full filling of the worked up space, excavation of ore from the chambers of subsequent bursts under collapsed overlying rocks, characterized in that, in order to increase the completeness and quality of ore extraction from the bowels during the development of stock-shaped ore bodies, simultaneously with the forced collapse Overlying rocks with directed camouflage blasting outline the natural balance and form a large-block structure for self-collapse of rocks inside the specified arch, form a cushion from forcibly collapsed and self-collapsed rocks, and excavate ore by passing formed cushions of chambers of subsequent bursts after for lower mining.