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2019 Plan of Operations Modification American Gypsum Company, LLC <br /> Description Date Agency 11,11 <br /> TR-10: Additional Lower Pit mining activities 27 November 2017 CO DRMS <br /> TR-11: Upper Pit 6900 Access Road 09 January 2019 CO DRMS <br /> Plan of Operations Modification (Upper Pit 6900 Access 06 May 2019 BLM <br /> Road) <br /> Notes: 0]CO DRMS was previously the Department of Natural Resources Mined Land Reclamation Division; <br /> referred to as CO DRMS. <br /> [21 Technical Revision JR)approvals are on record with CO DRMS. <br /> [31 BLM approval for these modifications is not available in historic records; implemented changes from <br /> TR-06 and TR-07 are included in this Modification. See Sections 6.0 and 8.3.1 for details. <br /> American Gypsum continues to mine the Upper Pit (mining activities have been ongoing since <br /> 2007)and was approved to expand the Lower Pit within the existing disturbance footprint in 2017 <br /> (CO DRMS, 2017). Mining activities will resume in the Lower Pit in 2019 and are anticipated to <br /> continue until accessible gypsum is exhausted. <br /> The Lower Pit and Upper Pit are mined using a rotomill that grinds layers of gypsum and inert, <br /> un-economic material (intraburden) in approximately 6-inch layers, with a working width of <br /> approximately 10 to 12 feet. Front-end loaders separate the mined material into in-pit stockpiles, <br /> where it is loaded into 25-ton over-the-road haul trucks and shipped to the plant, on-site gypsum <br /> stockpiles, or intraburden/overburden storage areas. These mining methods create pit walls with <br /> a 1 H:1 V (Horizontal:Vertical) inter-bench slope. Pit benches (approximately 10 feet wide) are <br /> created every 40 vertical feet as the pit depth progresses. <br /> Gypsum is processed into wallboard directly at the plant; there are no on-site processing facilities <br /> and therefore no processing chemicals or acid-producing materials used or stored at the Mine. <br /> Exploratory drilling in 2006 identified additional gypsum on the hillside to the east of the Upper <br /> Pit, which will herein be referred to as the East Pit. <br /> 1.4 General Description <br /> The Mine is in the Eagle River Valley in Eagle County, Colorado, approximately 1.5 miles north <br /> of the municipality of Gypsum. The Mine is located in Sections 28, 29, 30, 31, 32, and 33, <br /> Township 4 South, Range 85 West (6th Principal Meridian). Lands within the existing and <br /> proposed mine permit area generally slope from north to south and are bounded to the south by <br /> Interstate 70 (1-70). <br /> 1.5 Operator Information <br /> The Mine is owned and operated by American Gypsum. Contact information is provided below. <br /> American Gypsum Company, LLC <br /> P.O. Box 980 <br /> Gypsum, CO 81637 <br /> Phone: (970) 524-8151 <br /> Confidential information such as American Gypsum's taxpayer identification code is included in <br /> Appendix A. <br /> Am Gypsum Poo Mod ISSD 20190909 September 2019 [7] <br />