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This method is really a combination of several different methods of stoping. The figure is an illustration of the method, and shows half of the vein cut away where the stoping is being done. The miners go from the haulage level up the raise into the sublevels. On the first sublevel they will blast into the shape of funnels the raises that come up from the haulage level, and after working back, the slice, s, by breast stoping will drill holes at a and shoot part of this bench
Beryl is a relatively rare silicate mineral with a chemical composition of Be3Al2Si6O18. It is found in igneous and metamorphic rocks in many parts of the world. Beryl has served as a minor ore of beryllium, and color varieties of the mineral are among the world’s most popular gemstones. Emerald, aquamarine, heliodor, and morganite are the most well-known varieties of beryl - "Geology.com".
Grasberg mine in the Papua province of Indonesia ranked as the world’s tenth largest copper mine by reserve. The mine’s open pit and underground copper reserves as of December 2012 were estimated at 10.47Mt. The mine produced 315,246t of copper in 2012. Grasberg was also the biggest gold mine in the world by reserve. The Grasberg mineral deposit was discovered in 1988. Open-pit mining operation started in 1990. PTFI holds a 90.64% interest in the Grasberg mining operation. Th
The removal of water from solid materials by thermal drying plays a significant role in modern mineral processing. A great number of dryer types are available. Convection dryers, employing a flow of hot combustion gases to remove moisture from a pulp stream, are the most common. To this type belong rotary drum, conveyor, and fluidized-bed dryers - Encyclopedia Britannica.
With a bucket capacity of 11.5m³ to 13m³ and operating weight of 107.3t, the Komatsu WA900-3E0 wheel loader with 856hp (638kW) engine is the world’s eighth biggest front-end loader. The WA900-3E0 in high-lift boom configuration offers 17.3ft of dump clearance and 7.4ft of dumping reach. The operating height of the loader in fully raised condition is 32.5ft, while the overall length with bucket on the ground is 48.2ft - Mining Technology.
Side stoping is an extreme of combination stoping in which the working face of the stope is vertical. The face is parallel to the raises just as the face in flat-back stoping is parallel to the levels. Breast stoping refers to the working of a flat orebody, or a flat section of an orebody, just as coal is mined from a flat coal seam. That is, a slice is worked in a horizontal direction. The assumption is that there is no open stope either above or below the slice, or else the
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Benitoite is an extremely rare mineral that is best known for being the official state gemstone of California. It is a barium titanium silicate mineral, usually blue in color, that is found in rocks that have been altered by hydrothermal metamorphism. Its chemical composition is BaTi(Si3O9). Benitoite’s identification and original description was based upon specimens found in the headwaters of the San Benito River, in San Benito County, California, from which it received its
Jubilee, also known as the Yubileyny diamond mine, located in Sakha (Yakutia), Republic of Russia, is the biggest diamond mine in the world. The mine was estimated to contain more than 153 million carats (Mct) of recoverable diamonds, including 51Mct of probable underground reserves as of January 2013. The open-pit diamond mine is owned and operated by the Aikhal mining and processing division of Russia’s state-owned diamond company Alrosa. The mine has been in production sin