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砂矿床是由含有自然金属或有用矿物颗粒的松散岩石或胶结层组成的次生矿床。它具有强度低(整体岩石)、松散和透水性强等特点。由于砂矿床的开采技术条件不同,开采
The sand deposit is a secondary deposit composed of loose rock or cemented layer containing particles of natural metals or useful minerals. It has low intensity (the whole rock), loose and water permeability and so on. As a result of different sand mining technology conditions, mining