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The required amount of explosives could be calculated according to the formula:

Figure 3 The required amount of explosives could be calculated according to the formula:

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Table 1 State of balance coal reserves in “Rembas“ mine (in tonnes) 1.1 Geological Structure of the Ravna Reka Deposit
Table 1 State of balance coal reserves in “Rembas“ mine (in tonnes) 1.1 Geological Structure of the Ravna Reka Deposit
Figure 1 Construction of a shortwall face by a distance of full dip
Figure 1 Construction of a shortwall face by a distance of full dip
Figure 2 The cycle of work at a shortwall face: a) drilling in the subsection, b) coal loading after blasting, c) setting of the roof beam, d) setting of the friction prop, e) obtaining the roof coal, f) moving conveyor to the starting position The shortwall work technology consists of two basic phases, which are repeated cyclically. In the first phase, the coal under- cutting is carried out in the subsection part of a shortwall face by the drilling-blasting works. Therefore setting support, loading and removal of coal are carried out. In the second phase, after the certain face progress in the subsection part and after removal the friction props from a demolition line, coal is obtained from the upper part of coal seam. Obtaining of a roof coal can be done alter- nately at the face; while in one part of the face there is excavation in a subsection, in the second part the caving of the roof coal will be done. The work cycle is shown in Figure 2.
Figure 2 The cycle of work at a shortwall face: a) drilling in the subsection, b) coal loading after blasting, c) setting of the roof beam, d) setting of the friction prop, e) obtaining the roof coal, f) moving conveyor to the starting position The shortwall work technology consists of two basic phases, which are repeated cyclically. In the first phase, the coal under- cutting is carried out in the subsection part of a shortwall face by the drilling-blasting works. Therefore setting support, loading and removal of coal are carried out. In the second phase, after the certain face progress in the subsection part and after removal the friction props from a demolition line, coal is obtained from the upper part of coal seam. Obtaining of a roof coal can be done alter- nately at the face; while in one part of the face there is excavation in a subsection, in the second part the caving of the roof coal will be done. The work cycle is shown in Figure 2.
Figure 3 Drilling diagram and order of loading initiation at the coal face with the center cut (interval of slowing is 34 ms) Considering the number of drillholes, drilling according to the schedule given in Figure 3 is adopted. Initiation of loadings is done by the millisecond electric detonators, intended for use in the methane mode. In this case, four slowdown intervals are used.
Figure 3 Drilling diagram and order of loading initiation at the coal face with the center cut (interval of slowing is 34 ms) Considering the number of drillholes, drilling according to the schedule given in Figure 3 is adopted. Initiation of loadings is done by the millisecond electric detonators, intended for use in the methane mode. In this case, four slowdown intervals are used.
Table 2 Comparative overview of indicators of the applicable mining methods for the Ravna Reka deposit On the basis of all the considered param- eters, it can be said that the proposec shortwall excavation is more than an ade- quate replacement for the pillar methods both from the aspect of better productivity and organization, and from the aspect of financial profit. excavation intensity, and significantly higher productivity.
Table 2 Comparative overview of indicators of the applicable mining methods for the Ravna Reka deposit On the basis of all the considered param- eters, it can be said that the proposec shortwall excavation is more than an ade- quate replacement for the pillar methods both from the aspect of better productivity and organization, and from the aspect of financial profit. excavation intensity, and significantly higher productivity.
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