نتایج جستجو برای: underground mining
تعداد نتایج: 99723 فیلتر نتایج به سال:
Underground mines are a special type of environment which requires significant attention since they directly relate to miners‟ productivity, health and safety. With coal or ore exploitation into deep underground mine environments, high temperature and humidity creates risks because of large amounts of heat generated from geothermal heat, mining machines, groundwater and mine water. There have b...
Abstract The catastrophic failure of coal under super-critical stresses and mining-induced disturbance is becoming one major safety risks underground mining. Research the pattern o...
System simulation is an increasingly popular technique for analyzing and improving existing as well as newly designed underground mining operations. An engineering firm that specializes in simulation helped a major metals producer build a long-range planning model of an existing underground mine. Subsequently the team adapted this model to assess technology alternatives in the design of a new m...
In December 2003, the assets of the Cassandra Mines (N.E. Halkidiki, Greece) of TVX HELLAS S.A., were transferred by law, ratified by the Greek Parliament, to the Greek State for 11 million euros. They were sold the same day to HELLAS GOLD S.A. for the same price without prior economic assessment of the assets and without an open competition [19]. The assets include mining and exploration conce...
LHD (load-haul-dump) vehicles are used extensively in underground mining operations for ore transporting, primarily in tunnels where access is difficult or dangerous. To ensure underground efficient and safe LHD’s performance, a robust feedback control strategy is needed. A state estimation based MPC scheme was designed for control purposes, and evaluated by simulation. The state estimator was ...
Coal is the most highly used source of energy for generating power in the world. Although, it has adverse environmental impacts (Weart, 2003), it is so widely used mainly because it is relatively cheap, abundantly available and readily fits with traditional power generation technologies. It is extracted from mines using both underground and surface mining techniques – either of them having adva...
China, as the largest coal-producing and -consuming country in the world, is highly dependent on its coal industry, or “Black Gold” industry, for the national energy and economy. The consequent environmental crises, however, have persisted for decades, and the most serious effect is surface subsidence induced by underground mining. Underground coal excavation in China has ignored this problem f...
The most important determinant of whether there is a radon problem is the presence of uranium and radium in the bedrock and overburden. As the permeability of the ground controls the ease with which radon can be transported, any cavity that exists underground has the potential to accumulate elevated levels of radon. Buildings built upon the ground surface have the potential to draw in ground ga...
Underground mines are a vital part of the European raw material industry. The subsurface mining process is related to large-scale development underground structures like tunnels, chambers, workings, etc. These abandoned or liquidated during exploitation after termination works. Still, due unique environment, post-mining facilities may be adopted for different purposes. There few examples implem...
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