minera escondida which means 'hidden' in spanish is a mining company that operates two open pit copper mines in the atacama desert, 170 km southeast of antofagasta in northern chile.it is currently the highest producing copper mine in the world. its 2007 production of 1.483 million tons of the metal was worth us$ 10.12 billion, mainly as metal in concentrate, but some as cathode, and was 9.5 .
outburst management. outburst management primarily focuses on the prevention of outbursts by pre-draining the gas from coal seams prior to mining. the aim of gas drainage is to lower the gas content of the seam below a certain threshold value, at which time it is considered safe to mine the seam.
drift mining. drift mining is either the mining of an ore deposit by underground methods, or the working of coal seams accessed by adits driven into the surface outcrop of the coal bed. a drift mine is an underground mine in which the entry or access is above water level and generally on the slope of a hill, driven horizontally into the ore seam.
automated mining involves the removal of human labor from the mining process. the mining industry is in the transition towards automation. it can still require a large amount of human capital, particularly in the developing world where labor costs are low so there is less incentive for increasing efficiency.
shortwall mining, a method currently accounting for less than 1 percent of deep coal production, involves the use of a continuous mining machine with movable roof supports, similar to longwall. the continuous miner shears coal panels 150 to 200 feet 45 to 60 metres wide and more than a half-mile 1 km long,.
on 8 august 1956, a major mining disaster occurred at the bois du cazier coal mine. an accident began at 8:10 am when the hoist mechanism in one of the shafts was started before the coal wagon had been completely loaded into the cage. electric cables ruptured, starting an underground fire within the shaft.