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RECEIVE <br />D <br />AMERICAN NOV D 8 2017 <br />GYPSUM <br />DIVISION OF RUCL4 Allom <br />MININOAND SAFET y <br />November 7, 2017 <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street <br />Room 215 <br />Denver, Colorado 80203 <br />Attn: Travis Marshall <br />The following letter is in response to the preliminary adequacy review for R-10. Updated <br />reclamation estimates are required to determine reclamation liability for the Lower E the Eagle - <br />Gypsum Mine, CDRMS Permit M-1984-041, in Eagle County. Separate correspondence frorn <br />Knight Piesold and Company is being forwarded directly, under American Gypsum cover letter, in <br />response to the preliminary and secondary adequacy review requests. <br />The proposed expansion and reclamation plan does not propose to disturb any additional <br />acres over the previously approved plan; therefore much of the existing reclamation liability should <br />be accurate and sufficient. In order to update the reclamation liability we assumed the "worst case" <br />reclamation scenario as a completely mined out Lower Pit as indicated in the West Pit Backfill & <br />Grading Plan - West Pit Expansion and Access Road Plan (Figure 4). We also assume that the <br />exhausted pit backfill, Northing 1,668,500 and north, will be sufficiently complete to allow for <br />grading, seeding and revegetation only. The reclamation liability should be updated as follows: <br />• An additional eight (8) acres of exposed highwall will require grading, seeding and <br />revegetation. The highwall was to remain indefinitely as part of the previous plan. <br />• An additional 308,600 Cubic Yards (CY) will be moved from the west dump site to <br />the pit utilizing an excavator/loader and truck. See West Pit Backfill & Grading Plan <br />(Figure 1) for location. <br />• An additional 400,000 CY will be dozed into the empty Lower pit from the east. The <br />access road will be completely removed from station 23+00 to 33+00 and the <br />completed reclamation area allowed to flow through into an existing drainage east of <br />the pit. See West Pit Expansion and Access Road Plan (Figure 4) for location <br />information. <br />The Lower pit area is dominated by high relief topography and exposed outcrops, creating, <br />significant quantity updates from small design changes, and reclamation quantities should be <br />American Gypsum Company - 740 E lighw ay 6- PO BOX 980 -Gypsum, COS 1637 - Mine Office 970-524-7944- Plant 970-524-8103 <br />