2021-08-17_REVISION - M1977342 ‎(4)‎

• Permit No: M1977342
• IBM Index Class Name: Revision
• Doc Date: 8/17/2021
• Doc Name: Adequacy Review Response
• From: Climax Molybdenum Company
• To: DRMS
• Type & Sequence: TR34
• Email Name: PSH
• Email Name: JLE
• Media Type: D
• Archive: No

TR-34 to Permit M-1977-342
Environmental Protection Plan
Table of Contents
1. INTRODUCTION......................................................................................................................................................1
1.1. Purpose and Objectives................................................................................................................................1
1.1.1. Reference and Indexing......................................................................................................................1
1.1.2. Changes in Referenced Information and Documents........................................................................1
1.1.3. Emergency Response Plan..................................................................................................................1
2. DESCRIPTION OF SITE AND SITE FIGURES.............................................................................................................3
2.1. Henderson Mine&URAD Water Treatment Plant......................................................................................3
2.2. Henderson Mill.............................................................................................................................................3
2.3. Site Figures...................................................................................................................................................3
3. OTHER AGENCY ENVIRONMENTAL PROTECTION MEASURES AND MONITORING..............................................5
3.1. General Information.....................................................................................................................................5
4. OTHER PERMITS AND LICENSES.............................................................................................................................6
4.1. Other Permits and Licenses..........................................................................................................................6
5. DESIGNATED CHEMICAL EVALUATION..................................................................................................................7
5.1. List of Chemicals and Specific Locations......................................................................................................7
5.2. Known Potential to Affect Human Health and the Environment...............................................................10
5.3. Safety Data Sheets for Designated Chemicals............................................................................................13
6. DESIGNATED CHEMICALS AND MATERIALS HANDLING.....................................................................................14
6.1. Disposal, Decommissioning, Detoxification or Stabilization......................................................................14
6.1.1. Designated Chemicals Handling.......................................................................................................14
6.1.2. Acid-Forming Materials and Acid Mine Drainage Handling ...........................................................15
7. ENVIRONMENTAL PROTECTION FACILITIES........................................................................................................17
7.1. Mine Environmental Protection Facilities..................................................................................................17
7.1.1. Mine Environmental Protection Facilities........................................................................................17
7.1.2. Designated Chemical Storage Facilities...........................................................................................19
7.2. Mill Environmental Protection Facilities....................................................................................................20
7.2.1. Process Water and Tailing Circuit....................................................................................................20
7.2.2. Designated Chemical Storage Facilities...........................................................................................25
7.2.3. Stormwater Diversion System..........................................................................................................29
8. GROUNDWATER...................................................................................................................................................30
8.1. Water Maps................................................................................................................................................30
8.2. Site Geology...............................................................................................................................................30
8.2.1. Mine..................................................................................................................................................30
8.2.2. Mill....................................................................................................................................................30
8.3. Site Hydrogeology......................................................................................................................................31
8.3.1. Mine..................................................................................................................................................31
8.3.2. Mill....................................................................................................................................................31
9. GROUNDWATER QUALITY DATA.........................................................................................................................33
Climax Molybdenum Company August,2021
Henderson Operations Page i of iv