2025-06-23_INSPECTION - C1981018

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June 11, 2025 C-1981-018/Deserado Mine TJ1 Number of Partial Inspection this Fiscal Year: 9 Number of Complete Inspections this Fiscal Year: 4 Page 3 of 13 There are three ponds located in the main facilities area: the DP-1 Pond, the PP-1 Pond and the PP-2 Pond. The DP-1 Pond is located on the southern part of the lower facilities bench. DP-1 collects all runoff from the from the three facilities benches. The outlet structure was clear of debris and the pond was discharging at the time of inspection. The embankments appear stable with well-established vegetative cover (Photo 2). The emergency spillway has minor amounts of vegetation but still appears to be able to convey water and is well armored. There were no erosional concerns identified. The PP-1 Pond is located on the middle bench of the facilities area near the prep plant. The pond held minor amounts of water and was well below the discharge level (Photo 3). There were no erosion or stability issues identified in the PP-1 Pond. The PP-2 Pond is located on the upper facilities bench. The outlet structure was in good condition with no vegetation obscuring the outlet (Photo 4). Water diversion ditches throughout the main facilities area were unobstructed and stable. The B Seam Dewatering System No. 1 was active during the inspection. Cells were impounding water. There was well established vegetation on the embankments of the cells. The cells were stable with no erosional or other stability features noted. The Last Chance Pond was discharging approximately 25 gpm at the time of the inspection (Photo 5). The SS-2 Pond is located at the northwestern base of the Slot Storage Facility. The pond was dry at the time of the inspection. The embankments of the pond were well vegetated and stable with no indications of erosion (Photo 6). The RS-1 Sump and the RR-1 Pond are located at the south side of the Rail Loadout. The RS-1 Sump was dry (Photo 7). There were no indications of erosion. The RR-1 Pond was dry. The embankments of the pond seem stable. The erosion feature on the northern embankment that has been noted in previous inspection reports does not appear to have grown in size (Photo 8). The Rail Loadout Storage South Ditch has minor amounts of vegetative debris but does not appear obstructed and is able to convey water. Two ponds are located at the northern base of Refuse Pile RP-2/3/4. The RP -2/3 Pond is located on the pile’s northeast corner. The Pond consists of three cells – the upper cells were holding water at the time of the inspection. The channels above the ponds appear clear of debris. No erosional features were noted on the embankments of the conveyance ditches. The trash rack was clear of debris. The RP-4 Pond is located at the northwest base of the pile. The pond was dry during the inspection. The outlet for the RP-4 Pond is capped with a trash rack. The outlet was clear of debris. Animal burrows were noted in the embankments of the RP-4 Pond and were filled during the inspection (Photo 9). Pond RP-5 is located at the northern base of the RP-5a Refuse Pile. The pond was dry at the time of the inspection. The embankments of the ponds were vegetated and seemed stable (Photo 10). No indications of erosion were observed. The outlet was clear of obstructions. 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. 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 are clear of debris and haybales used to control sediment are functioning as designed.