Section R. 425.32 - Surface overburden stockpilesRule 32.
(1) Surface overburden stockpiles shall be sloped at an angle which minimizes erosion, promotes vegetation, and is consistent with a future use of the mining area.(2) Where substantial natural vegetation is not expected within 5 years, or where erosion is occurring, or where the supervisor finds erosion likely to occur, which results or may result in injury or damage to fish and wildlife, the pollution of air or water, or which is causing or might cause injury to the property or person of others, surface overburden stockpiles shall be stabilized by planting with a vegetative cover, or by other treatment, to prevent erosion or pollution or injury.Mich. Admin. Code R. 425.32