R 425.42 Tailings basin drainage system.

Rule 42. A suitable system shall be constructed to regulate or control drainage of water, including surface run-off, from within the diked area of a tailings basin to prevent breaching of the dikes, both during and after termination of the mining operation. The system may consist of, but is not limited to, decant towers, erosion-resistant spillways, or solid rock ledge overflow.