white dr marten boots Open Pit Mining and Quarrying
This review will first define the difference between open pit mines and quarries. It will then cover the details on open pit mining methods, design aspects, and gives an example of an open pit mine. In the later half, quarrying is covered with more focus on the sequence of mining in a quarry. Its characteristics, mining machineries involved, and publications are also mentioned. Finally, a few more topics are covered which include computer codes,
laws, and codes of practice. Publications, organizations, and a list of companies supplying to the quarrying industry are also given.The ores in an open pit mine are covered by overburden. Both the ores and overburden are removed in benches ranging from height 9 m to 30 m. A thin deposit may require one or few benches but a thick deposit needs more number of benches and the pit in its production stage resembles like an inverted cone. This is decided by economic reasons and a breakeven point is decided beyond which it is not economic to continue production. As a thumb rule, a bench height is equal to the economic bucket height of an excavator (like shovel or loader) plus 3 m. The thickness of the orebody and its dip and the thickness overburden also play a deciding role in the bench height. As mentioned in Coal Trading, the bench height depends up on:b)Production strategy: ore/waste ratios, blending requirements,
no. The main role of the processing facility is to cut and polish the rock.