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During the removal of overburden, toxic or acid-forming materials are often encountered and must be segregated and isolated during mining so as not to be a detriment to successful revegetation, spoil disposal areas, affect the stability of backfill or contribute to acid mine drainage (AMD). It is not always apparent from an on-the-ground inspection that AMD is present or it may be in a location that is not easily accessed.
(1) Toxic- or acid-forming materials must be handled and disposed of in accordance with ARM 17. 24. 505, 17. 24. 507, and 17. 24.