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2019 Plan of Operations Modification American Gypsum Company, LLC <br /> ➢ Backfilling the Upper Pit with inert overburden or intraburden from the Upper Pit and East <br /> Pit; and <br /> ➢ Reclaiming the Upper Pit, East Pit, and associated infrastructure not included in previous <br /> permit applications (haul roads). <br /> Current mining activities at the Upper Pit and Lower Pit (including roads, stockpiles, <br /> intraburden/overburden storage, water management, reclamation plans, etc.) are being <br /> conducted at the Mine under permits and approvals received from the CO DRMS and BLM from <br /> 1984 (Colorado Department of Natural Resources (CO DNR), 1984) to 2017 (BLM, 2017; CO <br /> DRMS, 2017).American Gypsum also submitted a minor modification request to modify the Upper <br /> Pit 6900 Access Road in October 2018 (Tierra Group International, Ltd. (Tierra Group), 2018), <br /> with modifications to the reclamation plan submitted to BLM in April 2019 (Tierra Group, 2019); <br /> the minor modification was approved by CO DRMS (2019a) and BLM (2019) with conditions of <br /> approval . This Plan only includes additional road modifications required to access the Upper Pit <br /> expansion and the East Pit. Operations and practices would continue as described in the 2002 <br /> permit (BLM, 2002; CO DRMS, 2001) for all facilities and areas not included in this Modification. <br /> Section 1.3 contains additional information regarding the history of mining activities at the Mine. <br /> All existing permits and approvals in conjunction with the active operations plan would remain in <br /> effect, until or unless modified by submittals related to the proposed activities described herein. <br /> The existing wallboard manufacturing plant is excluded from this Modification. <br /> Am Gypsum Poo Mod ISSD 20190909 September 2019 [21 <br />