2025-04-23_INSPECTION - C1981018

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April 15, 2025 C-1981-018/Deserado Mine TJ1 Number of Partial Inspection this Fiscal Year: 8 Number of Complete Inspections this Fiscal Year: 3 Page 3 of 11 HYDROLOGIC BALANCE - Rule 4.05 Drainage Control 4.05.1, 4.05.2, 4.05.3; Siltation Structures 4.05.5, 4.05.6; Discharge Structures 4.05.7, 4.05.10; Diversions 4.05.4; Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13; Drainage – Acid and Toxic Materials 4.05.8; Impoundments 4.05.6, 4.05.9; Stream Buffer Zones 4.05.18: 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 (Photo 2). The embankments appear stable with well-established vegetative cover. 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 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. 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 at the time of the inspection. 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 5). 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 (Photo 6). 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. An animal burrow was noted in the embankment of the RP-4 Pond (Photo 7). Please fill the burrow and any others in the area. The outlet for the RP-4 Pond is capped with a trash rack. The outlet was clear of debris. 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. No indications of erosion were observed. The outlet was clear of obstructions. The Raw Water Lagoon is in the southeastern portion of the permit boundary off CR-65 and adjacent to the White River. There was no evidence of erosion or instability along pond embankments. The pipeline that moves water from the river into the pond was in good condition. The pump that delivers water from the pond to the facilities area was free of obstructions/debris time of the inspection (Photo 8).