2012-10-05_REVISION - M1977342 ‎(12)‎

• Permit No: M1977342
• IBM Index Class Name: REVISION
• Doc Date: 10/5/2012
• Doc Name: Submittal- EPP, Cover to Material Safety Data- CYTEC
• From: Climax Molybdenum Co.
• To: DRMS
• Type & Sequence: TR18
• Media Type: D
• Archive: No

TR -18 to Permit M- 1977 -342
Environmental Protection Plan
Mine EPF 1.2 — Storm Water Diversion System:
Storm water diversion systems have been constructed on the:
• South side of the Mine office and surface operations to divert un- impacted storm water
around industrial activities to the east end of the property; and
• West end and along the north side of the Mine property to divert un- impacted storm
water to the West Fork Clear Creek
See section 10.2 and the Henderson Storm Water Management Plan (SWMP) in Appendix B
for additional information on storm water diversion systems.
Effectiveness: The storm water diversion canals have been effective in preventing the amount
of storm water that can come into contact with disturbed land, designated chemicals and
potentially toxic or acid forming materials. As a result, the potential pollution of storm water is
greatly reduced.
Monitoring: The storm water diversion system is inspected twice per year in accordance with
Henderson's SWMP (see Section 10.2 and Appendix B for additional information).
7.2. Mill Environmental Protection Facilities
Environmental Protection Facilities at the Henderson Mill site involve three main
areas /categories:
• Process Water and Tailings Circuit;
• Designated Chemical Storage Facilities; and
• Storm Water Diversion System.
The EPFs in these areas are defined and evaluated in Sections 7.2.1, 7.2.2 and 7.2.3 respectively.
Figures 4 — 10 identify the locations of the EPFs at the Mill site.
Leaks, spills, or any other accidental or unauthorized releases are immediately addressed and
reported as described in the SPCC /MCP and IRM (Appendix A). In addition, Henderson has
contracted with Belfor Environmental Services (800- 930 -0011) to provide third party emergency
services and are available to assist in the event of an accidental release.
7.2.1. Process Water and Tailings Circuit
The Henderson Mill employs a zero discharge process water circuit. There is no active discharge
of process waters, although the CDPS Permit for Henderson Mill allows for the discharge of
process waters under certain emergency conditions identified in the permit. The water
management system at the Mill includes the following components:
• East Branch Reservoir System includes:
o East Branch Dam;
o East Branch pump station;
o Process Water Line; and
o Process Water Tanks;
• The Milling System including:
o Tailings delivery line;
• Emergency Cutout
• No. 1 Cutout
Climax Molybdenum Company
Henderson Operations
October, 2012
Page 16 of 40