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Section 2 <br />/l/estigafio/7Approachano'AclIv es <br />NP:AP relative to the potential to generate acid in the future: <br />¦ <1 indicates a high potential. <br />¦ 1 to 2 indicates a moderate potential. <br />¦ 2 to 4 indicates a low potential. <br />¦ >4 indicates an unlikely potential. <br />These thresholds are used along with evaluation of mineralogical data in order to <br />classify the potential for the source material to generate acid in the future. <br />2.2.2 Total Metals Analyses <br />Total metals analyses measure the total concentration of particular metals or <br />metalloids in a rock. Total metals data do not provide specific information regarding <br />the potential mobility of the particular metal or metalloid, but they are useful in <br />conducting general evaluations of the potential for mine rock to cause adverse <br />impacts to human health or the environment. The mechanisms of human or <br />environmental exposure may include leaching, dispersion as dust, incidental <br />ingestion though recreation activities or other mechanisms. In the event that <br />constituents occur in problematic concentrations in the mine rock, knowledge of total <br />metals concentrations facilitates development of appropriate mitigations to interrupt <br />is potential mechanisms during mine development or reclamation and mitigate <br />associated environmental liabilities. <br />2.2.3 Meteoric Water Mobility Procedure Analyses <br />Some mine rocks have the propensity to cause mine drainage that contains elevated <br />concentrations of problematic constituents but is not acidic. Examples of constituents <br />that may be mobilized from mine rock at problematic concentrations under near- <br />neutral pH conditions include selenium, arsenic, and molybdenum. <br />The meteoric water mobility procedure (MWMP) is used to evaluate the potential for <br />constituents to be mobilized from mine rock by meteoric water. The procedure <br />consists of a single-pass column leach over a 24-hour period using a mine rock sample <br />to extraction fluid (effluent) ratio of 1:1. The extraction fluid is Type II reagent grade <br />water (e.g. distilled or deionized water). The extraction fluid is then analyzed for <br />constituents of potential environmental concern. <br />2.2.4 Geochemical Sorption Potential Analyses <br />Analyses of the geochemical adsorption potential of natural soils underlying the <br />development rock stockpiles were completed during this investigation. This <br />information is included in Attachment 3. <br /> <br />2-5 <br />TA64986-Denison Mines\Ta