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TR -18 to Permit M- 1977 -342 <br />Environmental Protection Plan <br />7. ENVIRONMENTAL PROTECTION FACILITIES <br />An "Environmental Protection Facility" (EPF) is defined in Section 1.1(14) of the Rules as "...a <br />structure...for control or containment of designated chemicals, acid mine drainage, or toxic or <br />acid - forming materials..." EPFs, as defined, are present and operational at both the Mine site and <br />the Mill site and are discussed below. <br />The EPFs discussed in Section 7.1, 7.2.1 and 7.2.3 below are continuously monitored in <br />accordance with the Groundwater Management Plan (GWMP), approved as TR -16, to assess <br />their overall effectiveness. The approved GWMP includes narratives and maps used to describe <br />site locations, sample designators, the sample parameters, the sampling frequency, the media <br />being sampled, the method of sampling and analysis applied, and the reporting date, as required <br />per 6.4.21(7)(d). <br />7.1. Mine Environmental Protection Facilities <br />Environmental Protection Facilities at the Henderson Mine site involve the conveyance of <br />impacted underground mine water, which is piped offsite for treatment at the URAD Mine, and <br />the storm water diversion system. <br />The related EPFs (Mine EPF 1.1 and 1.2) are defined and evaluated below. Surface features of <br />EPF 1.1 (mine water conveyance) and 1.2 (stormwater diversion system) are shown on Figure 3 <br />and 11, respectively. <br />Leaks, spills, or any other accidental or unauthorized releases are immediately addressed and <br />reported as described in the SPCC /MCP and IRM (Appendix A). In addition, Henderson has <br />contracted with Belfor Environmental Services (800- 930 -0011) to provide third party emergency <br />services and are available to assist in the event of an accidental release. <br />Mine EPF 1.1 — Mine Water System: Mine water is collected underground and pumped to <br />settlers on the 7500 level. A non -toxic flocculent is drip -fed into the settlers to aid <br />precipitation. A non -toxic scale inhibitor is also added at various sites to keep piping clear. <br />After settling, the mine water is pumped from the 7500 level to the 8100 level. A portion of <br />this water is diverted for use in drills. The remainder is pumped to the surface through the #2 <br />shaft. Once at the surface, the mine water is pumped off site to the URAD Mine for treatment <br />via 12" and 14" HDPE pipelines and appurtenances. <br />Solids from the settlers are generally sent to the Mill for processing. Some solids have been <br />stored in mine drifts in the past; however, this material is of similar composition to the native <br />ore, and may be mined out in the future. <br />Effectiveness: The mine water settlers and conveyance structure and appurtenances have been <br />effective for the conveyance of mine water. There have been no releases in the last 10 years. <br />Monitoring: The mine water system is routinely inspected by Mine personnel to assess <br />effectiveness and integrity. Routine maintenance is performed (currently every 60 days) to <br />mitigate the build -up of scale inside the pipeline. Maintenance and /or updates to facilities, <br />systems, equipment, or procedures are performed as needed to be protective of the environment <br />and to prevent releases. <br />Climax Molybdenum Company <br />Henderson Operations <br />October, 2012 <br />Page 15 of 40 <br />