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Section 2 <br />Investigation Approach <br />Exhibit 2-1. Diagrammatic Representation of Development Rock Areas Showing Layering Produced by <br />Facility Construction and Orientation of Planned Sampling Trenches. <br />Ore stockpiles were sampled by collecting multiple increment samples at ore stockpiles. Each <br />stockpile sample included 20 to 40 individual increments collected to provide for representative <br />samples. The ore samples were composited to form one representative composite sample of the <br />ore from the Sunday, Carnation, St. Jude, West Sunday and Topaz mines and one duplicate <br />sample. In addition, one composite sample was prepared from ore stored in a low-grade <br />stockpile at the Sunday mine. <br />Development rock piles at the Sunday, St. Jude, West Sunday, and Topaz mines were sampled <br />via trenching in August, 2008. A total of 12 trenches were completed and 12 corresponding <br />development rock samples were collected from the development rock piles. Maps showing the <br />location of the trenches are shown in Figures 2-1 through 2-4, and field maps and photographs <br />of the trenches and sampling activities are included in Attachment 2. <br />2.1.2 Background Soil Samples <br />Nine background soil samples were collected in areas upslope and upwind from the existing <br />mine facilities to estimate background metal concentrations. Background soil samples were <br />collected by hand using a trowel at a relatively shallow depth of 0 to 12 inches. The background <br />soils samples were collected on the ridge between Big Gypsum and Disappointment Valleys in <br />areas approximately 2,000 feet upslope from areas of surface mine disturbance. These sampling <br />locations are shown on Figure 2-5. <br />2.1.3 Native Soil Underlying Development Rock Stockpiles <br />Four native surface and subsurface soil samples were also collected from areas adjacent to each <br />of the development rock areas. These soil samples were collected to facilitate assessment of soil <br />underlying the development rock areas, which may be in contact with seepage from the <br />development rock areas. These samples were collected from natural soils located adjacent to the <br />development rock storage facilities to provide a sample representative of soils underlying the <br />stockpiles. The location of these soil samples is shown on figures 2-1 through 2-5. <br />2.2 Laboratory Analyses <br />In order to understand the potential for acid- or toxic forming materials to be present at the <br />Sunday Mines Group, laboratory analyses were completed to evaluate: <br />¦ Acid-forming potential; <br />¦ Total metals content; <br />¦ Meteoric water mobility procedure (MWMP); <br />¦ Geochemical adsorption potential; and <br />¦ Physical characteristics. <br />10 Exhibit 2-2 summarizes the laboratory analyses completed during this investigation. <br />cm 2-2 <br />7:164986-Denison Mines%Task Order 3 - DMO Sampling and Analysis Plan%Task 3.12 - Soil, Ore, Rock Data Assessment ReporfiSunday Rock Repomfinal reportV2eportlFinal Sunday Mines Group Soil Ore Rook <br />Data Assessment Reporl_051509.dac