Open-pit miningUploader: Bagar 4 years ago Subscribe 4
Azimuths are angles measured clockwise from any meridian. Bearing — A surveying term used to designate direction. Universal coal cutter - A type of coal cutting machine which is designed to make horizontal cuts in a coal face at any point between the bottom and top or to make shearing cuts at any point between the two ribs of the place. Shallow coal mines working under townships, reservoirs, etc. Pinch — A compression of the roof and floor of a coal seam so as to "squeeze" out the coal.