In coal mining this is the intended basis for roof bolting. Bearing — A surveying term used to designate direction. The bearing of a line is the acute horizontal angle between the meridian and the line. The meridian is an established line of reference. Azimuths are angles measured clockwise from any meridian.
Bituminous coal is a type of coal found in the most coalfields. It is laid down in seams and varies in constituency and quality. It was used to produce town gas or coke, raise steam in industrial boilers or locomotives, to fuel power stations or for domestic heating.
Here's a list of ten interesting mining terms you might like to know, if you don't already. We've "mined" the nuggets on this list from social news site Reddit, where various contributors posted the terms and definitions in answer to a question about miners' slang.
A. Abutment - In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abutments of the arch of strata spanning the roadway; and (2) the weight of the rocks over a longwall face is transferred to the front abutment, that is, the solid coal ahead of the face and the back ...