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Page 6 of 40 <br />Trust our People.Trust <br />mom <br />our Data. <br />Billings, MT 888.735.4489 <br />■ Casper, WY 888.235.0515 <br />www.energylab.com <br />Gillette, WY 666.886.7175 <br />■ Helena. MT 817.472.0711 <br />LABORATORY ANALYTICAL REPORT <br />Prepared by Casper, WY <br />Branch <br />Client: Alexco Resource US Corp <br />Report Date: 04/18/18 <br />Project: Schwartzwalder Mine <br />Collection Date: 03/07/18 11:27 <br />Lab ID: 018030580-003 <br />DateReceived: 03120118 <br />Client Sample ID: Mine Refill <br />Matrix: Aqueous <br />MCL! <br />Analyses <br />Result Units Qualifiers RL QCL <br />Method <br />Analysis Date! By <br />NON-METALS <br />Organic Carbon, Total (TOC) <br />3.4 mglL <br />05 <br />A6310 C <br />03!21!18 16.241 dmb <br />METALS, DISSOLVED <br />Arsenic <br />0.002 mglL <br />0.001 <br />E200,8 <br />03/26/18 13 431 ell -b <br />Barium <br />0.06 mglL <br />0.05 <br />E200,7 <br />03/23118 16 17 1 ell -lb <br />Iron <br />0.73 mglL D <br />0.08 <br />E200,7 <br />03!23118 16 17 1 eli-b <br />Manganese <br />0.252 mglL <br />0.001 <br />E200,8 <br />03!26118 13.431 eli-b <br />Molybdenum <br />0.065 mglL <br />0.001 <br />E200,8 <br />03!26118 13 431 ell - b <br />Uranium <br />395 mglL <br />0.0003 <br />E200.8 <br />03!26118 13 43 1 eli-b <br />METALS, TOTAL <br />Arsenic <br />0.005 mglL <br />0.1)01 <br />E20D 8 <br />03/24/18 04 00 ! eli-b <br />Barium <br />1.95 mglL <br />0.05 <br />E200.8 <br />03/24/18 04 401 eli-b <br />Iron <br />2.73 mglL <br />0.03 <br />E200.8 <br />03/24/18 04 401 eli-b <br />Manganese <br />0.136 mglL <br />0.001 <br />E200,8 <br />03/24/18 04 001 eli-b <br />Molybdenum <br />0.118 mglL <br />0.001 <br />E200.8 <br />03!24118 04 00 1 eli-b <br />Uranium <br />2.87 mglL <br />0.0043 <br />E200 8 <br />03124!18 04.001 eli-b <br />RADIONUCLIDES, TOTAL <br />Radium 226 <br />3.6 pCi1L <br />E903.0 <br />04/02/18 11:431 arh <br />Radium 226 precision (t) <br />0.8 pCUL <br />E903.0 <br />04:02!18 11.431 arh <br />Radium 226 MDC <br />0.2 pCi1L <br />E903.0 <br />04:02!18 11.431 arh <br />Radium 228 <br />0.2 pCi/L U <br />RA -05 <br />03+28118 10 551 plj <br />Radium 228 precision (t) <br />1 pCi1L <br />RA -05 <br />03/28/18 10 551 plj <br />Radium 228 MDG <br />1.6 pCi1L <br />RA -05 <br />03/28/18 10 551 plj <br />Radium 226 + Radium 228 <br />3.9 pCi/L <br />A7500 -RA <br />04/03/18 14:54 ! sec <br />Radium 226 + Radium 228 precision :t} <br />1.3 pCi1L <br />A7544 RA <br />4410311$ 14 54 !sec <br />Radium 226 + Radium 228 MDC <br />1.6 pCilL <br />A7500 -RA <br />04/03/18 14:541 sec <br />CLIENT PROVIDED FIELD PARAMETERS <br />Field Conductivity <br />1162 umhosltm <br />FIELD <br />03/07/18 11:271 <br />Field pH <br />7,42 s,u, <br />FIELD <br />03!07118 11:271 <br />Field Temperature, C <br />7 8 'C <br />FIELD <br />03/07/18 11:271 <br />Oxidation -Reduction Potential (ORP) <br />147.2 mV <br />FIELD <br />03/07/18 11:271 <br />Field data provided by client <br />MCL - Maximum contaminant level. <br />Report RL - Analyte reporting limit <br />Definitions: OCL - Quality control limit <br />ND - Not detected at the reporting limit <br />MDC - Minimum detectable concentration <br />D - RL Increased due <br />to sample matrix <br />U - Not detected at minimum detectable concentration <br />Page 6 of 40 <br />