2024-08-09_INSPECTION - C1981018

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July 30, 2024 C-1981-018/Deserado Mine TJ1 Number of Partial Inspection this Fiscal Year: 1 Number of Complete Inspections this Fiscal Year: 0 Page 4 of 12 PROCESSING WASTE/COAL MINE WASTE PILES – Rule 4.10 and 4.11 Drainage Control; Surface Stabilization; Placement: The RP-2/3/4 pile was stable. The operator has graded the slopes of the stack to remove erosional rills since the previous inspection (Photo 7). The RP-5a pile appeared stable during the inspection. No new erosion on the slopes of the pile has been noted since the operator graded the rills in June. ROADS – Rule 4.03 Construction 4.03.1(3)/4.03.2(3), Drainage 4.03.1(4)/4.03.2(4), Surfacing and Maintenance4.03.1(5) and (6)/4.03.2(5) and (6), Reclamation 4.03.1(7)/4.03.2(7): The Haul Road was clear and well maintained (Photo 8). There we no sections with ruts or other road damage. The road surface was treated for dust, and no noticeable amount of dust was generated by haul trucks. The ditches that parallel the roads appear to be stable and able to convey water. CR-65 had no surface cracks or other indications of road damage due to subsidence. Access roads throughout the mine site were traversed during the inspection. Roads were stable and no erosional features were identified. RECLAMATION SUCCESS - Rule 4.15, Rule 3: The RP-1 refuse pile has been reclaimed for several years. Vegetation is well established and protects the pile. No indications of instability of erosion were observed. The perimeter diches appear stable with no erosion concerns. SUPPORT FACILITIES - Rule 4.04: Support facilities that were inspected include the main facilities/portals area, B-Vent Shaft #1, RDH-3, radio tower/water tank, and the conveyor corridor. The main facilities for the Deserado Mine are composed of three benches. The lower bench contains the mine, office, shop, and portals. The middle bench contains the prep plant, and the upper bench contains a materials laydown yard and electric substation. The drainage structures in the main facilities area were functioning correctly. There were no indications of erosional features on the three benches and berms were in good condition. The material laydown yard is well kept and organized. The safety fence surrounding the electric substation was in good condition. The B Seam Vent Shaft #1 is located north of the main facilities off of the haul road. The pad was stable with no erosional features (Photo 9). The fencing around the shaft to prevent unauthorized entry was in good condition. The pad for RDH-3 rock dust tank is located on the north side of the B Seam Dewatering System #1. The pad for the tank was stable with no indications of erosion. The radio tower and water tank are located to the north of the main facilities on separate pads. The pad for the tower was stable with no indications of erosion (Photo 10). The potable water treatment facility and water storage tank were in good condition. The pad associated with the tank had no indications of erosion or instability. During the inspection the Conveyor Corridor was traversed. The conveyor was running and well maintained. There were no indications of erosion underneath the conveyor.