2023-04-07_INSPECTION - C1981018 (2)

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March 29, 2023 C-1981-018/Deserado Mine CCW is relatively new and is continuing to fill out the designed footprint. No erosional concerns were noted. The RP-A refuse pile was stable. 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 at the Deserado mine was well maintained and dry. The road was stable with no erosional concerns. The portion of the haul road extending from CR-65 to the main facilities area has had some areas fill partially with sediment. Some of the straw bales used as check dams have also deteriorated. Please clean out the portions of the ditch that have become sedimented and replace the straw bales as necessary. Vital access roads throughout the mine site had been plowed of snow. During the inspection access roads were muddy from snowmelt. Most roads were passable but soft. The Division observed the roads to be stable with no off site impacts. Some roads have become rutted. Please repair these access roads when the ground conditions allow. Roads identified with rutting include the access roads to the RDH-2 pad,RDH-3 pad and the road to the bottom of RP-2/3/4. SUPPORT FACILITIES -Rule 4.04: Support facilities that were able to be accessed included;the main facilities/portals area, B Vent Shaft no. 1, RDH-2, RDH-3 (Photo 6), RDH-4,the Nitrogen Plant No. 2, The conveyor corridor,the Slot Storage, The radio tower(Photo 7),the West Mains Vent Shaft,and the water storage tanks. A couple of culverts near the Nitrogen Plant No.2 were observed to be mostly plugged with sediment. The first culvert is a small pipe located on the north side of the Nitrogen plant No. 2 pad(Photo 8). Both the inlet and outlet of the culvert were almost completely buried. The second culvert is located at the entrance to the access road from the haul road directly southwest of the Nitrogen Plant No. 2 (Photo 9). Please clear out these culverts as soon as possible to help ensure snowmelt continues to flow through the designed ditches. SIGNS AND MARKERS—Rule 4.02: The mine identification signs are posted on the entrance to the permit boundary on CR-65. The signs displayed the current contact information for the permittee and the Division. The signs also include the assigned DRMS permit number. The ID signs were placed in unobstructed locations and the text was clearly legible. TOPSOIL—Rule 4.06 Removal 4.06.2; Substitute Materials 4.06.4(4); Storage and Protection 4.06.3; Redistribution 4.06.4: Several topsoil stockpiles are located throughout the mine site. All stockpiles inspected were covered with snow during the inspection. The topsoil pile markers were seen on top of the piles. Topsoil pile markers were T- posts covered with pieces of white PVC. There were no indications of erosion or instability observed on any of the stockpiles. DOCUMENTS RECEIVED: None OTHER(SPECIFY): None Number of Partial Inspection this Fiscal Year: 6 Number of Complete Inspections this Fiscal Year: 3 Page 4 of 11