Minn. Stat. § 116.0717: MINERALS DEPOSITION.

Notwithstanding rules prohibiting discharge of waste into saturated zones or rules governing variance procedures, the Pollution Control Agency may issue a permit for deposition of fine tailings from minerals processing facilities into mine pits provided the proposer demonstrates through an environmental impact statement and risk assessment that the deposition will not pose an unreasonable risk of pollution or degradation of groundwater.