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Section 2 <br />Investigation Approach and Activities <br />The investigation approach for this evaluation is described in detail in Development Rock, Ore, <br />and Soil Characterization Data Collection Work Plan (CDM 2008x). This section summarizes the <br />investigation approach and activities completed at the Sunday Group Mines to evaluate metals <br />concentrations and physical properties of mine development rock, ore, and soils. <br />2.1 Field Sampling <br />This section presents field sampling activities for development rock and ore, background soil, <br />and native soil underlying development rock stockpiles. <br />2.1.1 Development Rock and Ore Samples <br />In order to provide for representative samples, development rock samples were collected from a <br />series of trenches. Exhibit 2-1 is a diagrammatic representation of the development rock areas, <br />which shows the layering present in the facilities. The facilities were constructed by placing <br />development rock at angle of repose slopes extending away from the mine adits. As the size of <br />the underground facilities increased, subsequent layers of development rock were placed, <br />which cover the working face of the previously placed lavers. To collect a representative sample <br />of the layered development rock area, a series of trenches was constructed on the top ?'urtak r iyf <br />the facilities at angles approximately perpendicular to the development rock layer.. <br />The trenches were excavated through the surficial laver of displaced rock on the rennin;; <br />surface of the facility and exposed the underlying development rock construction lavers. A <br />composite sample of multiple increments was collected from each trench, which is ' <br />representative of the lavers exposed by the trench. Three trenches and three corresponding <br />samples were collected from each development rock area with the exception of the Carnation <br />Mine. The development rock areas at the Carnation Mine are reclaimed and vegetation is <br />currently established in these areas. In lieu of sample collection, visual observation of the <br />development rock was conducted to confirm that the material is similar to the development <br />rock encountered at the other Sunday Group mines. Accordingly, the development rock data <br />collected from the other Sunday Group mines will be used to characterize the Carnation Mine. <br />4- Natural Grand Surface <br />Prevloua LAYM of Derelopmew <br />Rock Placed at Angle of Repose <br />• <br />Cm <br />2-1 <br />M,nes.l-1 011, 3 DMD Samµ nq AM A,&",. P?.,, j aaw 3 '.. Se„ i,')" Hai "era AsBe> meal Rei-msunna Rock <br />DAla A e-enl Report 0515%9 dm y Rapo?J- rcpuniHepon\F nai Cuneay Mines G-p $p. O,a R-, <br />Surf clel layer Resuffing from <br />Grading of Ru"ny Surface