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April 8,2016 C-1981-025/North Thompson Creek Mine CCW <br /> Inspection Topic Summary <br /> NOTE: Y=Inspected N=Not Inspected R=Comments Noted V=Violation Issued NA=Not Applicable <br /> N -Air Resource Protection N -Roads <br /> N -Availability of Records N -Reclamation Success <br /> N -Backfill&Grading N -Revegetation <br /> N -Excess Spoil and Dev. Waste N - Subsidence <br /> N -Explosives N - Slides and Other Damage <br /> N -Fish&Wildlife N - Support Facilities On-site <br /> R -Hydrologic Balance N - Signs and Markers <br /> N -Gen. Compliance With Mine Plan N - Support Facilities Not On-site <br /> N -Other N - Special Categories Of Mining <br /> N -Processing Waste N -Topsoil <br /> COMMENTS <br /> This was a partial inspection of the North Thompson Creek Mines conducted on April 8th,2016. The innpection <br /> was conducted by Clayton Wein and James Stark of the Division of Reclamation,Mining and Safety(DRMS). <br /> Stanley Muhr of Minrec, Inc.,Kurt Dahl and Bryan Daugherty of Pitkin County Health Department were present <br /> for the inspection. The weather was clear and approximatly 60 degrees farenheight. The ground conditions were <br /> mostly dry. There were patches of snow in areas that provided prolonged amounts of shade. The inspection was <br /> conducted in response to a citizen report of mine water discharging out of a pipe on a hill side above North <br /> Thompson Creek on April 6,2016. The discharge area was reported to have an orange stain on the hillside. <br /> Discharge from the pipe was determined to be coming from Mine No. 3 within the North Thompson Creek mines <br /> permit area. <br /> HYDROLOGIC BALANCE -Rule 4.05 <br /> 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; <br /> Diversions 4.05.4; Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13; <br /> Drainage—Acid and Toxic Materials 4.05.8; Impoundments 4.05.6,4.05.9; Stream Buffer Zones 4.05.18: <br /> -The treatment system consisting of the ponds and underground pipes are a part of the developed water <br /> resource post mining land use at the North Thompson Creek Mines. The treatment system pipes mine discharge <br /> water from a shaft near the Mine No. 1 portal and from the Mine No. 3 Portal to the Long Pond. The Long Pond <br /> contains cattails to act as a vegetative filter to help reduce suspended solids. The design of the long pond allows <br /> the mine water discharge to aerate. The long retention time allows the iron in the water to oxidize,causing the <br /> orange/red staining seen at the inlet of the Long Pond. The water then enters the Long Pond discharge point which <br /> pipes the water underground to the first treatment pond, T-1. Pond T-1 is connected to Pond T-2 by an open <br /> channel. The combined treatment ponds have more vegetative filters and allow for additional aeration time. The <br /> discharge point at Pond T-2 sends water through a ditch to Pond P-9. Pond P-9 serves as the primary holding <br /> point for the water. The developed water resource is designed to contain the water on-site. If Pond P-9 fills to <br /> capacity,the water will discharge to an open ditch that leads to the Refuse Pond. The Refuse Pond is the last pond <br /> in the developed water resource. The water traveling through the ditch to the Refuse Pond often seeps into the <br /> Number of Partial Inspection this Fiscal Year: I <br /> Number of Complete Inspections this Fiscal Year: 3 <br /> Page 2 of 9 <br />