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maw-Trust our people. Trust our Data. Billings, MT 800.735.4489 ■ Casper, WY 888.235.0515 <br />www.energylab.com Gillette, WY 8615.686.1175 - Helena, MT 877.472.0711 <br />LABORATORY ANALYTICAL REPORT <br />Prepared by Casper, WY Branch <br />Client: Alexco Resource US Corp Report Date: 04118/18 <br />Project: Schwartzwalder Mine Collection Date: 03/16/18 12:50 <br />Lab ID: C18030580-010 DateReceived: 03120/18 <br />Client Sample ID: MW -15 Matrix: Aqueous <br />MCU <br />Analyses Result Units Qualifiers RL QCL Method Analysis Date 1 By <br />NUTRIENTS <br />Nitrogen, Nilrale+Nitrite as N <br />ND mg/L <br />001 <br />E353.2 <br />03/22/18 11.481 dmb <br />Phosphorus, Total as P <br />0.013 mg1L <br />0 005 <br />E365.1 <br />03/28/18 15 561 dmb <br />METALS, DISSOLVED <br />Aluminum <br />ND mg1L <br />0.2 <br />E200.8 <br />03/26/18 14 171 ell -b <br />Antimony <br />ND mg/L <br />0.001 <br />E200.8 <br />03/26/18 14 171 ell -b <br />Molybdenum <br />0 012 mg1 <br />0.005 <br />E200.8 <br />03/26118 14 17 / eli-b <br />Thallium <br />ND mg1L <br />0.0002 <br />E200.8 <br />03126/18 14 17 / eii-b <br />Uranium <br />00276 mg1L <br />0.0002 <br />E200.8 <br />03126/18 14 17 / eli-b <br />METALS, TOTAL <br />Aluminum <br />ND mg1L <br />0.2 <br />E200.8 <br />03124/18 04 211 eli-b <br />Antimony <br />ND mg1L <br />0.001 <br />E200.8 <br />03/24/18 04 21 1 eli-b <br />Arsenic <br />0 005 mg/L <br />0.001 <br />E200.8 <br />03/24/18 04 21 1 eli-b <br />Mercury <br />ND mg/L <br />010001 <br />E245.1 <br />03/27/18 15 101 eli-b <br />Thallium <br />ND mg1L <br />0.0002 <br />E200.8 <br />03/24/18 04 211 eli-b <br />RADIONUCLIDES, DISSOLVED <br />Radium 226 <br />22.0 pCi/L <br />E903.0 <br />04/02/18 15 081 arh <br />Radium 226 precision (t) <br />4.2 pCi/L <br />E903.0 <br />04/02/18 15 081 arh <br />Radium 226 MDC <br />0.2 pCi/L <br />E903.0 <br />04/02/18 15 081 arh <br />RADIONUCLIDES, TOTAL <br />Gross Alpha <br />128 pCi{L <br />E900 0 <br />03/29/18 22:471 trs <br />Gross Alpha precision (t) <br />25.7 pCiJL <br />E900 0 <br />03/29/18 22:471 trs <br />Gross Alpha MDC <br />36 pCiJL <br />E900 0 <br />03/29/18 22:471 trs <br />Gross Beta <br />18.7 pCiJL <br />E900 0 <br />03/29/18 22-471 trs <br />Gross Seta precision (t) <br />2.6 pCi1L <br />E900 0 <br />03/29/18 22-471 trs <br />Gross Seta MDG <br />4.4 pCilL <br />E900 0 <br />03/29/18 22-471 trs <br />CLIENT PROVIDED FIELD PARAMETERS <br />Field Conductivity <br />673.4 umhoslcm <br />FIELD <br />03/16/18 12.501 <br />Field pH <br />806 s u <br />FIELD <br />03/16/18 12:501 <br />Field Temperature, C <br />11 1 'C <br />FIELD <br />03/16/18 12:501 <br />Flow <br />005 gpm <br />FIELD <br />03/16/18 12:501 <br />Field data provided by client <br />Report RL - Analyle reporting limit. <br />MCL - Maximum contaminant level. <br />Definitions: QCL - Quality control limit. <br />ND - Not detected at the reporting limit. <br />MDC - Minimum detectable concentration <br />Page 15 of 40 <br />