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/. <br />Revised 04/20/90 <br />Section 816.101(a) Continued. <br /> <br />L~ <br />A detailed explanation of this mine plan and a justification for the <br />delay in backfilling is provided under Section 780.18. initial <br />backfilling, e.g., covering of the exposed coal seam in the pit <br />bottom, occurs within 180 days of final <br />816-129 aaaa <br />