2023-02-17_HYDROLOGY - M2007044

• Permit No: M2007044
• IBM Index Class Name: Hydrology
• Doc Date: 2/17/2023
• Doc Name: Water Monitoring - Groundwater
• From: Energy Fuels Resources Inc.
• To: DRMS
• Email Name: ACY
• Email Name: THM
• Media Type: D
• Archive: No

Whirlwind Mine Groundwater Characterization Report
Contents
EXECUTIVE SUMMARY .....................................................................................................ES-1
1.0 INTRODUCTION............................................................................................................. 1
1.1 Background.................................................................................................................. 2
2.0 PHYSIOGRAPHIC SETTING .......................................................................................... 4
3.0 GEOLOGIC SETTING..................................................................................................... 5
3.1 Lithology...................................................................................................................... 7
3.2 Geologic Structure......................................................................................................10
4.0 HYDROLOGY................................................................................................................11
4.1 Surface Hydrology......................................................................................................11
4.2 Hydrogeology..............................................................................................................13
4.2.1 Historical Hydrology Information ..........................................................................14
4.2.1.1 Historical Mine Water...........................................................................................14
4.2.1.2 Whirlwind Decline................................................................................................16
4.2.1.3 Cotter Exploration Drill Holes...............................................................................17
4.2.1.4 Umetco Test Hole BM00-1...................................................................................17
4.2.1.5 Energy Fuels Exploration Holes...........................................................................19
4.2.1.6 PR Spring and Packrat Mine................................................................................20
4.2.1.7 Monitoring Well W-1.............................................................................................21
4.2.1.8 Other Wells..........................................................................................................22
4.2.1.9 Spring Discharge.................................................................................................23
4.3 Hydraulic Data............................................................................................................24
5.0 WATER CHEMISTRY....................................................................................................25
5.1 Data Quality................................................................................................................26
5.2 Water Chemistry Signatures.......................................................................................26
5.2.1 Burro Canyon Chemistry......................................................................................27