11 Miss. Code R. § 8-2.5-53-5307
When no longer needed for monitoring or other use approved by the Department upon a finding of no adverse environmental or health and safety effect, or unless approved for transfer as a water well under § 5335, each exploration hole, other drill or borehole, well or other exposed underground opening shall be capped, sealed, backfilled or otherwise properly managed, under the direction of a qualified Registered Professional Geologist or Registered Professional Engineer and as required by the Department, under § 5303 and consistent with 30 CFR 75.1711. Permanent closure measures shall be designed to prevent access to the mine workings by people, livestock, fish and wildlife, and machinery, and to keep acid or other toxic drainage from entering the ground water or surface water.
11 Miss. Code. R. § 8-2.5-53-5307