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زمینشناسی و معدن::
روش استخراج ستون کوتاه
The extraction ratio for the initial mine development is predicted to be 70 % by the longwalling and 30 % by the short pillar method, i. e 270 t/day through the longwall extraction and 115 t/day by the short pillar extraction.
For individual extraction methods an indicator of preparations can be determine on example of short pillar method and longwall method in the east section ol seam 25 in the level of TN 9 tunnel.
Total length of preparation for the short pillar method directive road 250 m
Indicator of preparations for the short pillar method is 81 m / 10001.
Regarding the assumption that a 250 m long section will be interrupted by 1-2 faults on average, which will move the seam by a larger distance then its thickness, it is necessary to add to the coefficient of preparation by 6 m / 1000 t for the longwall method and 8m/ 1000 t for the short pillar method.
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