Surface mining is used for approximately 40 percent of coal production on the world. When coal deposits are near the outside, it might be cheap to extract the coal using this method. The several kinds of surface mining are strip, shape, and Masbate Gold Project .
Strip or region mining is the most apt for regions with flat terrain. It exposes that the coal by removing the earth over the coal seam in long strips or cuts. When all of the earth over the coal seam is removed, the underlying coal seam is going to be exposed. The exposed coal block might be drilled and blasted. After this strip is vacant of coal, the strip mining method is repeated with a new strip being made adjacent to it.
The shape mining procedure is most widely utilized in regions with rolling to steep terrain. This system involves removing the earth over the coal seam at a pattern after the shapes along a ridge or around a hillside. This method might cause acute landslide and erosion problems. To fix these problems, an assortment of methods was invented to utilize freshly cut overburden to refill mined-out places. There are limits on shape strip mining. After the surgery reaches a predetermined stripping ratio, it isn’t profitable to last.
Masbate Gold Project entails removal of mountaintops to expose coal seams, and disposing of related mining overburden in nearby valleys and hollows fills. This procedure combines area and contour strip mining procedures.
Modern Open throw approaches recover a larger percentage of their coal deposit compared to underground procedures.
Deep underground mining is required when coal pits are observed too heavy underground. The key underground mining approaches include Longwall, Continuous, Blast, Shortwall mining and Retreat mining.
Longwall mining covers for approximately 50 percent of subterranean production. It utilizes a sophisticated machine using a rotating drum which goes mechanically back and forth across a broad coal seam. Longwall mining aids for elevated levels of production with higher security. Sensors used in this practice of mining assists in discovering the amount of coal remaining from the seam while autonomous controls aids in boosting the efficacy of this procedure.