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June 10, 2020 C-1981-025/North Thompson Creek Mine RDZ <br />Inspection Topic Summary <br />NOTE: Y=Inspected N=Not Inspected R=Comments Noted V=Violation issued NA=Not Applicable <br />Y - Air Resource Protection <br />R - Availability of Records <br />NA - Backfill & Grading <br />NA - Excess Spoil and Dev. Waste <br />NA - Explosives <br />Y - Fish & Wildlife <br />R - Hydrologic Balance <br />Y - Gen. Compliance With Mine Plan <br />N - Other <br />NA - Processing Waste <br />Y - Roads <br />Y - Reclamation Success <br />Y - Revegetation <br />Y - Subsidence <br />Y - Slides and Other Damage <br />NA - Support Facilities On-site <br />R - Signs and Markers <br />NA - Support Facilities Not On-site <br />NA - Special Categories Of Mining <br />Y -Topsoil <br />COMMENTS <br />A complete inspection was conducted by Rob Zuber of DRMS on June 10, 2020. The weather was hot, and the <br />ground was dry. No MINREC, Inc. representative was present. <br />No cattle were seen onsite, but cow feces were seen in many places. <br />The landowner's pump system at Pond T-2 appeared to be operating at the time of the inspection. The pump could <br />be heard, and the pipe was very cool (on a hot day). <br />AVAILABILITY OF RECORDS — Rule 5.02.4(1): <br />A check at the Garfield County building in Glenwood Springs revealed no significant problems with the records <br />for the North Thompson Creek Mine. Some of the files require updating (the DRMS inspections and pond <br />inspections). This is understandable because of the courthouse being closed in recent weeks due to the COVID-19 <br />pandemic. A list of records is provided. <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 following ponds were inspected: the Long Pond, Treatment Pond T-1, Treatment Pond T-2, the Polishing <br />Pond (Pond P-9), and the Refuse Pond. No problems were identified with the ponds. All but the Refuse Pond <br />were discharging; the water level in this pond was relatively low (see photo). The water discharging from Pond 9 <br />was relatively clear, with no mineral staining or odor. The flow through the ponds appeared to be approximately <br />the same at the upper end (pipe from mine above the Long Pond) and out of Pond 9. No problems were identified <br />with the ponds. The embankment for the Refuse Pond is especially well vegetated. <br />Number of Partial Inspection this Fiscal Year: 1 <br />Number of Complete Inspections this Fiscal Year: 4 <br />Page 2 of 6 <br />