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GEM SERVICES <br /> Dawson Project—Tailings Characterization Page 27 <br /> 6 Signature <br /> This report"Tailings Geochemistry Characterization& Seepage Quality Estimate,Dawson <br /> Project,Final Report"was prepared by: <br /> GEM Services4��oFr"ss1° . <br /> a° `f <br /> D. D. D. SOLO' <br /> 3/ <br /> Diana Sollner,MASc,MBA,PEng(BC), CDI.D <br /> Principal,Mining Environmental Engineering <br /> 7 References <br /> Amec Foster Wheeler,2016. "Pre-Feasibility Study Report—Dawson Filtered Tailings Storage <br /> Facility." Report prepared for Zephyr Minerals Ltd.,Project No. 74201633,November <br /> 2016, 250 pp. <br /> ASTM D 5744- 07C1; Standard Test Method for Laboratory Weathering of Solid Materials <br /> Using a Humidity Cell1, April 2010 <br /> Brady,Nyle C., 1990. The Nature and Properties of Soils. 10"'ed.New York:Macmillan <br /> Publishing Company <br /> Domenico,P.A.,and Schwartz,F.W., 1990. Physical and Chemical Hydrogeology. New York: <br /> Wiley <br /> Environmental Protection Agency(EPA), 2021. Electronic Code of Federal Regulations. <br /> 40CFR440 Subpart J—Copper,Lead,Zinc, Gold, Silver and Molybdenum Ores <br /> Subcategory. Accessed June 2021. <br /> The International Network for Acid Prevention(INAP), 2009. Global Acid Rock Drainage Guide <br /> (GARD Guide).http://www.gardguide.com/ <br /> MEND, 2009. "Prediction Manual for Drainage Chemistry from Sulphidic Geologic Materials— <br /> MEND Report 1.20.1". Report prepared by CANMET-Mining and Mineral Sciences <br /> Laboratories,December 2009, 579pp. <br /> Price,W.A., 1997. "Guidelines and Recommended Methods for the Prediction of Metal <br /> Leaching and Acid Rock Drainage at Minesites in British Columbia—Draft." Reclamation <br /> DDSldds Zephyr Dawson_Tailings_Charaaerizatlor_FinaL Report,Feb.3,22,1:18 PM Feb 2022 <br />