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在露天矿用胶带运输机、汽车或列车这几种运输方式中,可移式胶带运输机更具有经济和多用性。由于地质条件不同,美国的露天开采多为间断开采法,而在欧洲则多为连续开采法。美国的煤、铁、磷酸盐均采自厚层水平矿床,剥离厚度小到中等,欧洲的矿床赋存较深、且层厚不均。美国低的采煤剥离系数平均为2:1,可用挖掘机、索斗铲和汽车进行开采和运输;而剥离系数高达10:1的欧洲煤矿则需采用连续运输方式。但美国的情况正在变化,一些露天煤矿在
In opencast belt conveyors, cars or trains these modes of transport, portable belt conveyors are more economical and versatile. Due to the different geological conditions, the open mining in the United States is mostly the intermittent mining method, while in Europe, it is mostly the continuous mining method. Coal, iron and phosphate in the United States are both collected from thick horizontal ore deposits. The stripping thickness is small to medium. Deposits in Europe are deep and have uneven layer thickness. In the United States, average coal mining stripping coefficient is 2: 1, which can be mined and transported by excavators, dragliners and cars. For the European coal mines with stripping coefficient up to 10: 1, continuous transportation is required. But the situation in the United States is changing, with some open-pit mines at