2013-11-29_HYDROLOGY - M1977493

• Permit No: M1977493
• IBM Index Class Name: Hydrology
• Doc Date: 11/29/2013
• Doc Name: Climax Mine, Robinson Seep investigations-2013 results
• From: Climax
• To: DRMS
• Email Name: ECS
• Media Type: D
• Archive: No

Status Report' Robinson Seep Investigation
EXECUTIVE SUMMARY .............................. ...............................
1.0 INTRODUCTION
Climax Molybdenum Company
TABLE OF CONTENTS
.............................1
....................... ............................... 3
1.1
Site Setting ............................................................................ ..............................3
1.2
Monitoring Program ............................................................... ..............................4
2.0 MONITORING
DATA AND TREND ANALYSIS ................................ ..............................6
2.1
Short Term Constituent Trends .............................................. ..............................6
2.2
Robinson Lake Water Levels ................................................ .............................19
2.3
Long Term Trends ................................................................ .............................21
3.0 ADDITIONAL
INVESTIGATIONS .................................................... .............................25
3.1 Field Reconnaissance and Water Sampling .......................... .............................25
3.2 Initial Drilling Program ........................................................... .............................32
3.3 Additional Drilling Program .................................................... .............................32
3.4 Field Observations ................................................................ .............................32
3.5 Analytical Results .................................................................. .............................34
4.0 CONCLUSIONS AND RECOMMENDATIONS ................................ .............................40
5.0 REFERENCES ................................................................................. .............................42
TABLES
Table 2.1: Microbial Activity Indicator Parameters - EVMW -1 S .................... .............................13
Table 3.1: Measured Field Parameters — Field Reconnaissance ................. .............................26
Table 3.2: Metal Concentrations - Reconnaissance and Water Sampling Program ..................30
Table 3.3: Measured Field Parameters — Drilling Programs ......................... .............................34
Table 3.4: Metal Concentrations — Drilling Programs ................................... .............................36
FIGURES
Figure 1.1: Monitoring Locations within the Eagle River Watershed ......... ..............................5
Figure 2.1: Short Term Trends of Various Constituents in Groundwater Monitoring Data ......8
Figure 2.2: Short Term Trends of Various Constituents in Robinson Lake, Robinson Lake
Seep, and EVMW- 1S ............................................................ .............................10
Figure 2.3: Typical Iron Stability Diagram of Groundwater Monitoring Data (September 2013
Data...................................................................................... .............................15
Figure 2.4: Typical Manganese Stability Diagram of Groundwater Monitoring Data
(September 2013 Data) ......................................................... .............................16
Figure 2.5: Typical Piper Diagram of Groundwater Monitoring Data (Taken From September
2013 Data) ............................................................................ .............................18
Figure 2.6: Robinson Lake Water Levels ................................................ .............................20
Figure 2.7: Long Term Trends of Various Constituents at Select Locations .........................23
Figure 3.1: Field Parameters for the Field Reconnaissance and Water Sampling Program .27
Figure 3.2a: Exposed Elk Mountain Porphyry, Western End of Cutoff Wall ............................28
Tetra Tech, Inc November 2013 i