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Forrest Luke <br />Page 4 of 4 <br />17 April 2020 <br />within the NPit will only have a swell of] 0%. It is unsure to the Division that there will be enough material <br />to not only backfill the A Pit ash dump but also the N Pit to the approved PMT. <br />Based on Agapito Associates, Inc. engineering report, the pile has a recommended designed for <br />7.6 million c.y. of spoil. According to Trapper Mine, approximately 6.4 million c.y. will be <br />needed to backfill the N Pit (5.6 million c.y.) and the A Pit (0.8 million c.y.). However, based on <br />Trapper's proposed discussion and Agapito Associates Inc. recommended design, the Division <br />cannot conclude that sufficient material exists to backfill both pits. <br />5. Please address the above comment by providing additional detail and information <br />ensuring that an adequate amount of material exists to backfill and regrade both the A <br />Pit and N Pit as proposed. <br />DRMS ADQ 3 TR124 17 April 2020 <br />Prepared by: R. Reilley <br />