Most of the coal mines in our country belong to pit coal mines.The scope of the coal mine includes a large area above ground, underground and associated facilities.Coal mine is the reasonable space excavated by human when excavating the geological layer rich in coal, usually including roadway, well adit and excavating face, etc.Coal is the main solid fuel, is a kind of combustible organic rock.It is from a certain geological age of the growth of the lush plants, in the appropriate geological environment, gradually accumulated into a thick layer, and buried in the bottom or sand, after a long geological time of natural coalification and formation.Among all geological periods in the world, the strata of Carboniferous, Permian, Jurassic and Tertiary have the most coal, which is an important coal-forming age.The carbon content of coal is generally 46 ~ 97%, brown to black, with a dull to metallic luster.According to the degree of coalification, coal can be divided into peat, lignite, bituminous coal and anthracite four types.