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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