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2019 Plan of Operations Modification American Gypsum Company, LLC <br /> 6.4 Annual Operation <br /> Mining is expected to take place year-round with periodic breaks not to exceed 4 days to <br /> accommodate holidays or poor weather conditions that may impact the ability to safely traffic mine <br /> access roads. The Mine typically hauls material 5 days per week (Monday through Friday) and <br /> typically operates from 6 a.m. to 5 p.m. Infrequently, the Mine operates on Saturdays, limited to <br /> hauling 4 Saturdays per year. <br /> 6.5 General Schedule of Operations <br /> Table 6.1 illustrates the estimated schedule of operations. <br /> TABLE 6.1: ESTIMATED SCHEDULE OF OPERATIONS <br /> Phase Activity Mining Year <br /> Operational— Active mining to the approved limits from the 2002 Year 1 to Year 12 <br /> Upper Pit(Permitted) permit(BLM, 2002; CO DRMS, 2001) <br /> Active mining to a pit floor elevation of 6760 feet amsl <br /> Operational— (maximum footprint extents), including using Year 12 to Year 15 <br /> Upper Pit Expansion intraburden for progressive reclamation (3:H:1V <br /> maximum slope) <br /> Active mining of interior pit benches to a pit floor <br /> Operational— elevation of 6560 feet amsl (pending drilling <br /> Upper Pit Interior confirmation/continuous gypsum at depths exceeding Year 15 to Year 25[21 <br /> Benches 6760 feet amsl), including using intraburden for <br /> progressive reclamation (2.51­1:1 V maximum slope) <br /> Progressive Reclamation Placing intraburden/overburden in the Upper Pit, <br /> —Upper Pit including forming the East Pit Access Road, with a Year 1 to Year 15 121 <br /> 2.51­1:1 V maximum slope <br /> Reclamation— Placing intraburden/overburden in the Upper Pit with a <br /> Upper Pit(Full Footprint, 2.51­1:1V maximum slope, covering with 6 to 12 inches Year 16 to Year 26 121 <br /> excluding active portion of growth medium, and revegetating with a native <br /> of East Pit Access Road) seed mixture <br /> Using existing roads to perform initial clearing and <br /> Site Development— grubbing, stockpiling growth medium (if encountered <br /> East Pit during clearing and grubbing)within existing Year 2 to Year 10 <br /> disturbance areas, removing overburden for haulage <br /> to the Upper Pit or East Pit Access Road <br /> Active mining to a pit floor elevation of 6900 feet amsl, <br /> Operational— including using intraburden for progressive <br /> East Pit reclamation (2.51-1:1 V slope)where possible and Year 15 to Year 41 <br /> stockpiling intraburden within the East Pit for future <br /> reclamation regrading <br /> Regrading intraburden to an overall 2.51-1:1 V slope, <br /> Reclamation— covering with 6 to 12 inches of growth medium, and Year 41 to Year 42 <br /> East Pit revegetating with a native seed mixture (includes <br /> portion of East Pit Access Road through the East Pit) <br /> Note: Approximate timing estimated assuming Year 1 is 2019. <br /> [21 Remaining durations assume Upper Pit is operational for 15 years;though it may provide gypsum for a <br /> total of 25 years. <br /> Am Gypsum Poo Mod ISSD 20190909 September 2019 [231 <br />