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The question of mining under the main haulage level as a way by which in some cases coal reserves can be effectively extracted is still discussed. The paper introduces advantages and disadvantages of this method. It presents examples of the bedding of a seam in a limited depth under level, for example 50 m, when the opening by the under level minin...
Contexts in source publication
Context 1
... give an example, when it seems preferable to use a typical way by deepening pits for opening a deposit. Figure 1 and 2 show fairly frequent cases of mining a seam under the main haulage level on different conditions of its bedding. These are the situations of individual seams (or a seam), whose typical opening would require a relatively high costs. ...
Context 2
... the literature [1] this method is described as "occasional, random". In the case "a" as in Figure 1 it is a group of coal seams, which is directed to the boundary of the mining field. The development of these coal seams would require driving out a long cross-cut plus a staple pit from the bottom at the level of 595 m. ...
Context 3
... all these cases it is so-called "outstanding" (incomplete) mining under the main haulage level. It is characterized by the fact that fresh air is fed from a higher (mining) level (the level at 485 m in Figure 1 and Figure 2). ...
Context 4
... contrast, in so-called solved (full) mining under the main haulage level the intake air is fed from the bottom level (the level at 595 m in Figure 1 and Figure 2). ...
Context 5
... fresh intake in the cases shown in Figures 1, 2 is fed from the main mining level through a staple pit, or dip working to the lowest point, the location of the seam, and from here then it progresses up through appropriate mine workings. The exhaust air returns to the main mining level and must be diverted to the return level through the shortest path. ...
Context 6
... consideration, though simplified, as neglects e.g. the costs required for mining equipment (plate conveyors, etc.), may be very appropriate for an indicative decision. For the given hypothetical example a graph can be compiled that would express how the costs of opening by deepening the pits burdens the costs per 1 ton of open reserves. (Fig. 10). For the situation according to Figure 9 and Table 1, on the curve left from the red line there is the weight of reserves when opened by deepening the pits, the typical development would burden the costs per one ton of the open reserves less than the system of under level ...
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