_INSPECTION - C1994082 (76) - Laserfiche WebLink

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June 1,2011 C-1994-082/Yoast Mine SLB Inspection Topic Summary NOTE: Y=Inspected N=Not Inspected R=Comments Noted V=Violation Issued NA=Not Applicable N -Air Resource Protection Y -Roads N -Availability of Records N -Reclamation Success Y -Backfill&Grading N -Revegetation NA -Excess Spoil and Dev. Waste NA -Subsidence NA -Explosives R -Slides and Other Damage N -Fish&Wildlife N -Support Facilities On-site R -Hydrologic Balance N - Signs and Markers Y -Gen. Compliance With Mine Plan NA - Support Facilities Not On-site NA -Other NA - Special Categories Of Mining NA -Processing Waste N -Topsoil COMMENTS This was a partial inspection of the Yoast Mine based on aerial photographs of the site taken June 1, 2011. The photographs were taken by Harry Ranney of DRMS, and reviewed by Susan Burgmaier in the DRMS Denver office on June 3, 2011. Weather conditions for the flight were clear. A few snow drifts remain on the upper areas, and the area was still wet with snowmelt. Ponds 11 A,012, and 012A, Haul Road B,portions of the South Pit area and the North pit were all photographed. 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: Ponds 1 IA, 012, and 12A were all holding water,but any sign of discharge was not apparent. There was a large sediment delta at the base of the gully(previously reported in the May 17,2011 inspection)that appeared to be deposited in an area not approved for disturbance. This area will be further investigated during the next on-the-ground inspection. SLIDES and DAMAGE -Rule 4.12: The Pond 012 slide had increased since the May 17, 2011 inspection;recent movement was observed on the north side of the pond,along the original repair area. The Pond 013 slide did not appear to have moved since the last inspection,but it did appear that water was still seeping through the slide material, as evidenced by standing water at the toe of the slide. A recent slump had developed on the slope above(southeast side)Pond 12A. A crack,roughly 1000 feet long was observed running through the 2006-1 shrub area. The slide along Haul Road B did not appear to have moved since the last inspection,but it also had standing water along the toe area. OTHER(SPECIFY) Number of Partial Inspection this Fiscal Year: 10 Number of Complete Inspections this Fiscal Year: 3 Page 2 of 7