Section 11-8-2.5-53-5389 - Backfilling and Grading: Time and Distance Requirements(a) Except as provided in § 5389(b) of this section, rough backfilling and grading for surface mining activities shall be completed according to one of the following schedules: (1) Contour mining. Within 60 days or 1,500 linear feet following coal removal; or(2) Area mining. Within 180 days following coal removal, and not more than four spoil ridges behind the pit being worked, the spoil from the active pit constituting the first ridge.(3) Other Surface Mining Methods. Rough backfilling and grading shall occur in accordance with the time schedule approved by the Permit Board, on the basis of the materials submitted under § 2715, which shall specifically establish in stated increments the period between surface mining activities and completion of back filling and grading.(b) The Department may extend the time allowed for rough back-filling and grading for the entire permit area or for a specified portion of the permit area if the permittee demonstrates in accordance with § 2715 that additional time is necessary.11 Miss. Code. R. § 8-2.5-53-5389