Mining Pitching Seams under Dangerous Roof Conditions
THIS paper has been confined to the consideration of the working of thick seams, from six feet to sixteen feet, which are pitching at about thirty degrees to the horizontal. The discussion has been limited to these set conditions because they are the ones of commonest occurrence in the Southern Alberta bituminous coal district, because, from the point of view of safety, thin seams are more easily. worked, and because a discussion of all the possible combinations of thick and thin seams pitching at angles varying from zero to ninety degrees with the horizontal would involve a task impossible in the time available.
caving, gob, Rocky Mountain Branch, strata, Transportation of Coal, Coal, conveyors, Dust, Mines, mining, Pressure, Systems