The backfilled pit is then covered with topsoil and seeded. Glacial drift - Sedimentary material that has been transported by glaciers. The final method of surface coal extraction to be described here is aptly called mountaintop removal. Mining continues until the pit is depleted or until mining becomes uneconomical for example, if the remaining oil sands is very low grade or too deep to be mined. Aerial magnetometer - An instrument used to measure magnetic field strength from an airplane. Explosives and Blasting in Open Cast.
open cast coal mining blasting pattern
Run-of-mine - A term used loosely to describe ore of average grade. Typical open pit mining method with thick coal seam. As it dispenses with drilling and blasting operations, surface mining proves to be the ideal alternative when it comes to making coal mining more environmentally friendly and more economically efficient at the same time. Pooling shares - See escrowed shares. Rock mechanics - The study of the mechanical properties of rocks, which includes stress conditions around mine openings and the ability of rocks and underground structures to withstand these stresses.
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Block caving - An inexpensive method of mining in which large blocks of ore are undercut, causing the ore to break or cave under its own weight. Vein - A fissure, fault or crack in a rock filled by minerals that have travelled upwards from some deep source. It normally ranges from very low quality sections containing lots of clays and little bitumen to very high quality seams with high bitumen grades and very coarse sand. The Environmental Effects of Strip Mining. The term often implies that there are metallurgical difficulties in liberating and separating the valuable metals. Share, rate, categorize and discuss links or have others to do it for you. Dividend - Cash or stock awarded to preferred and common shareholders at the discretion of the company's board of directors.
The SM has been in operation in two fields of the Shenhua mine since the spring of Glossary of Mining Terms Appendix H: This normally includes trees, shrubs or wetlands, but the pit could also be capped with water and turned into a pond. Open pit mining is similar to area mining. This process continues along parallel strips of land so long as the ratio between the overburden and the coal seam, called the stripping ratio , makes it economically feasible to recover coal.