Overburden
Overburden means the unconsolidated material that overlies a deposit of useful materials or ores. It does not include any portion of ore or waste rock.
Source
40 CFR § 372.3
Scoping language
Terms defined in sections 313(1)(c) and 329 of Title III and not explicitly defined herein are used with the meaning given in Title III. For the purpose of this part: