2025-04-29_HYDROLOGY - M2007044

• Permit No: M2007044
• IBM Index Class Name: Hydrology
• Doc Date: 4/29/2025
• Doc Name: Hydrology Report
• From: Energy Fuels Resources Inc
• To: DRMS
• Annual Report Year: 2025
• Report Quarter_Month: 1
• Permit Index Doc Type: Hydrology Report
• Email Name: ACY
• Email Name: THM
• Media Type: D
• Archive: No

WHIRLWIND MINE,PERMIT NO.M-2007-044
FIRST QUARTER 2025 HYDROLOGICAL REPORT
Attachment 5.PR Spring
Monitoring Sampled Inflow Rate Field pH Temperature Dissolved Specific Oxygen-
Date (Y/N) (gpm) (s.u.) (deg.C) Oxygen Conductance Reduction Comments
(mg/L) (US/cm) Potential(mV)
3/22/2018 No 6.0 7.91 9.60 11.00 577.0 120
6/20/2018 Yes 5.0 7.82 11.93 9.64 613.0 -4.7
9/7/2018 No 4.5 7.95 12.68 12.15 588.0 164
12/14/2018 No 4.5 6.83 6.02 ** 557.0 337
Q1 2019 No NM NM NM NM NM NM Inaccessible due to county road conditions
6/25/2019 Yes 6.5 8.03 12.20 6.44 785.0 238
9/13/2019 No 4.2 7.88 12.59 9.27 812.0 295
11/8/2019 No 4.9 8.10 11.14 10.34 802.7 337
3/27/2020 No 2.5 8.10 9.19 10.70 773.0 896
6/24/2020 Yes 4.5 7.98 11.49 9.88 754.0 413
9/11/2020 No 2.8 8.10 11.65 8.51 883.0 242
11/6/2020 No 2.0 8.25 11.19 8.92 853.0 251
Q1 2021 No NM NM NM NM NM NM Inaccessible due to county road conditions
6/18/2021 No 2.0 6.78 12.06 10.48 860.0 176
7/13/2021 Yes 5.0 7.58 14.15 9.55 819.0 255
9/9/2021 No 5.0 7.91 12.26 9.25 857.0 253
11/9/2021 No 4.5 7.60 9.02 13.88 668.0 67.2
3/30/2022 Yes 6.6 7.87 9.45 13.38 765.0 132.7
6/23/2022 No 4.5 8.43 11.07 12.21 82&0 235.7
8/1/2022 Yes 5.0 7.98 13.00 9.57 827.6 412.0
11/16/2022 Yes 4.1 6.62 11.46 9.66 888.4 489.0
Q1 2023 No NM NM NM NM NM NM Inaccessible due to county road conditions
5/10/2023 Yes 5.5 8.12 9.74 9.43 490.0 24.3
7/25/2023 Yes 5.5 NM 13.83 10.17 989.9 213.0 Field pH was not measured, lab pH was reported as 8.1
10/31/2023 Yes 1.2 7.62 9.14 12.95 797.0 3.2
Q1 2024 No NM NM NM NM NM NM Inaccessible due to county road conditions
5/1/2024 Yes 1.7 6.67 10.18 41.55 812.0 143.9
9/11/2024 Yes 1.0 8.03 11.71 7.77 805.0 120.1
10/30/2024 Yes 0.76 8.08 10.69 7.62 801.0 145.7
Q1 2025 No NM NM NM NM NM NM Inaccessible due to county road conditions
*-ORP Probe broken during 4/18/11 Monitoring Event.
**-Meter malfunctioned during site visit-no measurements were taken.
Note: PR Spring not accessible in February or March, 2010 due to deep snow
NM=Not Measured