Coal as one of energy alternative is obtain from the ground. The Coal is valued for its energy content, and since the 1880s has been widely used to generate electricity. In the United States, United Kingdom, and South Africa, a coal mine and its structures are a "colliery". In Australia, "colliery" generally refers to an underground coal mine.
As one of the alternative energy, the coal mining has had a lot of developments over the recent years, from the early days of men tunneling, digging and manually extracting the coal on carts to large open cut and long wall mines. Mining at this scale requires the use ofr, trucks, conveyor, jacks and shearers.
Methods of extraction
The most economical method of coal as energy alternative is extraction from coal seams which depends on the depth, quality of the seams, geology and the environmental factors. The coal mining processes are differentiated from the surface or underground. Many coals extracted from both surface and underground mines require washing in a coal preparation plant.
