2024-12-16_REVISION - M1977410 ‎(15)‎

• Permit No: M1977410
• IBM Index Class Name: Revision
• Doc Date: 12/16/2024
• Doc Name Note: Appendix G-5 Groundwater Baseline Data
• Doc Name: Request For Conversion
• From: Grand Island Resources LLC
• To: DRMS
• Type & Sequence: CN1
• Email Name: JPL
• Email Name: JLE
• Email Name: EL1
• Email Name: LJW
• Email Name: THM
• Media Type: D
• Archive: No

Cross Gold Mine
December 2024 G5-2

Table G5-2. Mean & Median Groundwater Results
Parameter, Limit Cabin Well Caribou Well Cross Well Lowest WQCD Reg 41 Standard
Mean Median Mean Median Mean Median
Aluminum 0.017 0.017 0.022 0.048 0.007 0.013 5
Antimony 0.001 0.001 0.001 0.001 0.003 0.003 0.0066
Arsenic 0.021 0.021 0.001 0.001 0.001 0.001 N/A
Barium 0.041 0.040 0.009 0.033 0.029 0.029 2
Beryllium 1.350 1.350 0.000 0.000 0.000 0.000 0.004
Beta and Photon Emitters 2.90 2.900 2.33 1.948 2.67 2.837 N/A
Boron 0.020 0.020 0.008 0.016 0.008 0.011 0.75
Cadmium 1.093 1.640 0.000 0.000 0.000 0.000 0.005
Calcium 21.1 23.700 5.6 6.500 25.9 30.600 N/A
Chloride 2.780 2.720 0.456 0.470 3.378 3.540 250
Chromium 0.002 0.002 0.002 0.002 0.002 0.002 0.1
Cobalt 0.000 0.000 0.000 0.000 0.000 0.000 0.05
Copper 0.007 0.010 0.260 0.657 0.008 0.023 0.2
Corrosivity 0.005 0.005 0.012 0.012 0.005 0.005 N/A
Cyanide [Free] 0.153 0.180 0.170 0.170 0.700 0.700 2
Fluoride 0.564 0.506 0.390 0.402 1.279 5.568 N/A
Gross Alpha Particle Activity 0.074 0.162 0.018 0.026 0.035 0.058 0.3
Iron 0.001 0.002 0.000 0.001 0.001 0.002 0.05
Lead 0.010 0.010 0.011 0.011 ND ND 2.5
Lithium 0.039 0.099 0.002 0.003 0.002 0.003 0.05
Manganese 0.002 0.002 0.000 0.000 0.000 0.000 0.002
Mercury 0.005 0.005 0.004 0.004 0.001 0.001 0.21
Molybdenum 0.001 0.001 0.001 0.001 0.001 0.001 0.1
Nickel 0.268 0.260 0.115 0.115 0.275 0.285 N/A
Nitrate 1.246 4.125 0.109 0.120 0.280 0.305 N/A
Nitrate-Nitrite Total 0.150 0.150 0.047 0.043 0.044 0.044 N/A
Nitrite 7.0 6.950 6.9 7.105 7.1 7.200 0
pH 0.001 0.001 0.001 0.001 0.010 0.010 0.02
Selenium 22.4 61.010 2.6 2.350 9.4 9.980 0.05
Sulfate 65.9 65.000 46.0 88.500 95.0 102.500 250
TDS 0.000 0.000 0.000 0.000 0.000 0.000 N/A
Thallium 0.000 0.000 0.003 0.003 0.000 0.001 0.002
Uranium 0.054 0.054 0.001 0.001 0.001 0.001 0.0168
Vanadium 0.124 0.176 0.010 0.032 1.174 3.472 0.1
Zinc 0.017 0.017 0.022 0.048 0.007 0.003 2
Groundwater data in the above table is the arithmetic mean and median sample result value for each analyte from all sampling from July 2022 to the present. Units are mg/L unless otherwise specified.
Histograms of select parameters are shown below.