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Cross Gold Mine <br />December 2024 G5-1 <br /> <br /> <br />Table G5-1. Maximum Groundwater Results <br />Parameter, Limit Cabin Well Date Caribou Well Date Cross Well Date Lowest WQCD Reg 41 Standard <br />Aluminum 0.032 8/25/2022 0.093 5/16/2023 0.024 0.024 5 <br />Antimony 0.0012 7/7/2022 0.0012 7/7/2022 0.0041 0.0041 0.0066 <br />Arsenic 0.0409 4/18/2023 0.0006 7/7/2022 0.002 0.002 N/A <br />Barium 0.0456 8/25/2022 0.06 1/17/2024 0.0324 0.0324 2 <br />Beryllium 2.7 4/18/2023 0.0001 7/7/2022 ND 0.0001 0.004 <br />Beta and Photon Emitters 3.1 7/7/2022 3.5 5/16/2023 4.87 4.87 N/A <br />Boron 0.02 7/7/2022 0.03 11/29/2022 0.02 0.02 0.75 <br />Cadmium 3.28 4/18/2023 0.0001 7/7/2022 0.0006 0.0006 0.005 <br />Calcium 31.9 7/7/2022 9.3 7/7/2022 45.3 45.3 N/A <br />Chloride 3.29 2/27/2023 0.53 3/21/2023 5.42 5.42 250 <br />Chromium 0.0015 7/7/2022 0.0015 7/7/2022 ND 0.0015 0.1 <br />Cobalt 0.0002 10/27/2022 0.0003 10/27/2022 0.0002 0.0002 0.05 <br />Copper 0.019 8/25/2022 1.23 3/21/2023 0.045 0.045 0.2 <br />Corrosivity -1.53 1/0/1900 -3.28 1/0/1900 -1.41 -1.41 N/A <br />Cyanide [Free] 0.005 7/7/2022 0.019 1/17/2024 ND 0.005 2 <br />Fluoride 0.26 8/25/2022 0.24 8/25/2022 1.3 1.3 N/A <br />Gross Alpha Particle Activity 1 7/7/2022 0.9 7/28/2023 11.3 11.3 0.3 <br />Iron 0.323 8/25/2022 0.045 5/16/2023 0.11 0.11 0.05 <br />Lead 0.0044 8/25/2022 0.0009 3/21/2023 0.0034 0.0034 2.5 <br />Lithium 0.0097 4/18/2023 0.013 1/17/2024 ND N/A 0.05 <br />Manganese 0.19 9/27/2022 0.0052 8/31/2023 0.0051 0.0051 0.002 <br />Mercury 0.0043 4/18/2023 0.0002 7/7/2022 0.000071 0.0002 0.21 <br />Molybdenum 0.0059 8/25/2022 0.007 1/17/2024 0.0023 0.0023 0.1 <br />Nickel 0.0009 7/7/2022 0.0009 7/7/2022 ND 0.0009 N/A <br />Nitrate 0.31 9/27/2022 0.16 1/17/2024 0.38 0.38 N/A <br />Nitrate-Nitrite Total 8 4/18/2023 0.16 6/14/2023 0.42 0.42 N/A <br />Nitrite 0.27 4/18/2023 0.055 12/21/2023 0.057 0.057 0 <br />pH 7.3 10/27/2022 8.2 6/14/2023 8 8 0.02 <br />Selenium 0.0008 7/7/2022 0.0008 7/7/2022 0.0185 0.0185 0.05 <br />Sulfate 115 4/18/2023 2.8 6/14/2023 11.56 11.56 250 <br />TDS 104 8/25/2022 160 10/31/2023 143 143 N/A <br />Thallium 0.0002 7/7/2022 0.0002 7/7/2022 ND 0.0002 0.002 <br />Uranium 0.0003 2/27/2023 0.0058 1/17/2024 0.0014 0.0014 0.0168 <br />Vanadium 0.106 4/18/2023 0.0017 6/18/2024 0.0011 0.0011 0.1 <br />Zinc 0.346 8/25/2022 0.063 7/7/2022 6.43 6.43 2 <br /> <br />Groundwater data in the above table is the highest sample result value for each analyte from all quarterly sampling from sampling beginning in July 2022 and continuing quarterly through June 2024. Units are <br />mg/L unless otherwise specified. Values marked “ND” are cases where the analyte was never measured above the listed detection limit.