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زمینشناسی و معدن::
رگه زغال جامد
♦ solid coal seam - intercalation less then 0.4 m in the thickness (i. e. removable).
0 solid coal seam of a small thickness (0.4 - 0.8 m)
0 solid coal seam of a medium thickness (0.8 - 2.2 m)
0 solid coal seam of a high thickness (2.2 -3.5 m)
♦ Solid coal seams are suitable for mining by the longwall method. 1 he seam thickness determines the number ol mining benches - max. one bench thickness is 2.2 m.
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