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单词 overburden
释义
overburden

Chemical Engineering
  • The material in mining processes that lies above the material that is of economic interest. An example is the rock that lies over an ore or a seam of coal. It is also known as waste or spoil. Compare tailings.


Geology and Earth Sciences
  • 1. Any loose material which overlies bedrock.

    2. In a sedimentary deposit, the upper strata which cover, compress, and consolidate those beneath.

    3. Any barren material, consolidated or loose, that overlies an ore deposit. The depth and type of overburden may control whether an ore deposit is worked by underground or open-cast methods. The proportion of overburden thickness to mineral deposit is called the overburden ratio.


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