2011-12-15_REVISION - M1977493 (2)

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Technical Revision (TR -18) Climax Molybdenum Company Environmental Protection Plan Permit No. M- 1977 -493 alarms will be connected telemetrically to the mill control room to provide immediate notification should intake or discharge pressures exceed certain set points or pump upsets occur. The pump station is also equipped with instrumentation to monitor pump operating status, temperature, and vibration as well as discharge flow rate. These parameters will be relayed to and monitored at the mill control room. T - 5.5.3 Tenmile Creek Watershed Monitoring of the water treatment and discharge system, which verifies the effectiveness of the various EPFs associated with the water treatment system at Climax, is extensive and intensive. The CDPS Permit requires daily, weekly, monthly, and quarterly sampling and monitoring with reporting on a monthly basis. In addition, Climax conducts quarterly WET tests on discharged waters. Detailed information regarding the types of monitoring, parameters, frequency, reporting requirements, methods and analyses is found in the CDPS Permit. Water Treatment Chemicals: The chemicals used in the water treatment process, are GreatFloc 5500, lime and sulfuric acid. Lime and sulfuric acid are stored in steel silos and a 7,000 gallon tank, respectively. As described previously, GreatFloc 5500 is stored in one 2,500 gallon mix tank and one 3,000 gallon feed /storage tank. The mixing in the mix tank is done in batch operations and is monitored. The feed /storage tank is equipped with level controls to regulate tank levels. The lime silos located at the Lime Station are monitored visually. The sulfuric acid tank is monitored with telemetric level indicators. The acid metering system also contains a telemetric alarm. Designated Chemicals for Concentrate Production: Monitoring of the integrity of the designated chemical EPFs is a standard operating procedure at the Climax Mine during periods of operation when chemicals are maintained at the site. Each storage facility is visually checked by mill personnel. Leaks, spills, or other accidental or unauthorized releases are immediately reported. TDL and ETDL: Regular checks of the new TDL and the ETDL during periods of operation and during periods of inactivity are planned. While the TDL and a portion of the ETDL are planned to be used to transport tailing from the mill to the TSFs, they are also important links in the water treatment system at Climax. Robinson TSF and 2 Dam: Monitoring of 1 Dam was discussed in Section T- 5.5.2. Robinson TSF and 2 Dam are monitored visually by Climax personnel. As with all the TSFs, its location, size, and function allow for extensive observations. Tenmile TSF and 3 Dam: The Tenmile TSF, 3 Dam, and ancillary facilities such as Tenmile Decant and Tenmile Tunnel are monitored visually by Climax personnel. Piezometers are utilized to monitor water levels in the dam. Piezometric water levels are typically recorded on a weekly basis, and the data is reviewed by a third -party engineering consultant, generally on a semi - annual basis. Once active deposition resumes, monitoring will increase in frequency. Periodic inspections also include monitoring seepage to detect unusual flow quantity or clarity changes. Climax is developing operational plans for the Tenmile (3 Dam) TSF dam, to be implemented as tailing deposition resumes. Analyses are being completed to develop an understanding of the anticipated changes in pore pressure conditions in the operational facilities and will identify key piezometric elevations. This information will be submitted to DRMS, along with updated stability evaluations, in an operations and monitoring program for the TSF. Mayflower TSF and 5 Dam: The Mayflower TSF, 5 Dam, and ancillary facilities such as the riser /decant system are monitored visually by Climax personnel. Piezometers are utilized to monitor water levels in the dam. Piezometric water levels are typically recorded on a weekly basis, and the data is reviewed by a third -party engineering consultant, generally on a semi - annual basis. Once active deposition resumes, monitoring will increase in frequency. Periodic inspections also include monitoring seepage to detect unusual flow quantity or clarity changes. Climax is developing operational plans for the Mayflower (5 Dam) TSF dam, to be implemented as tailing deposition resumes. Analyses are being completed to develop an understanding of the anticipated EPP: Version R2 T -33 December 2011