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SOP#NMS-ANA-SOP-SWDC REV#1.1 Title:Solid Wst.Disposal Characterization Effective Date 10/11/2012 <br /> 6.5. pH 4.0 Standardized Buffer <br /> 6.6. pH 7.0 Standardized Buffer <br /> 6.7. pH 10.0 Standardized Buffer <br /> 6.8. Sodium Hydroxide Solution, 1.00N NaOH <br /> 6.8.1. Add 500ml of DI water to a 1000m1 beaker and stir on stir plate. Slowly add to <br /> the closest pellet 40.Og of NaOH. Let pellets dissolve completely. After <br /> solution has cooled, bring volume to 1000ml with DI water. Transfer solution <br /> to a properly labeled plastic container <br /> 6.9. Sodium Hydroxide Pellets <br /> 7. SAMPLE COLLECTION, PRESERVATION, STORAGE <br /> 7.1. Dry samples should be stored at room temp in solid sample receiving and wet <br /> samples should be stored in the analytical refrigerator found in the solid sample <br /> receiving room. To adequately simulate the natural leaching processes at work in <br /> the ore, the sample should be ran as received. <br /> 7.2. Leachate should be stored in the analytical liquid receiving after being preserved. <br /> 8. QUALITY CONTROL <br /> 8.1. An extraction blank should be carried through the extraction process with every <br /> batch for both extraction fluids <br /> 9. CALIBRATION AND STANDARDIZATION <br /> 9.1. The pH meter should be calibrated with 3-points, pH 4.0, pH 7.0, and pH 10 <br /> standardized solutions. If some measurements are found to be significantly <br /> outside of this range (<2 pH) it is necessary to recalibrate the pH meter using <br /> another standard that will accommodate the additional range. <br /> 10. PROCEDURE <br /> NOTE: All data must be recorded in SPLP\SWDC Lab book, located in the wet lab. <br /> 10.1. Determination of%Moisture <br /> 10.1.1. Dry sample pan to constant weight at 104°C. Cool in a vacuum desiccator <br /> and record weight to + 0.1 g. <br /> 10.1.2. Place 1 Og of sample to be tested into each pan and record weight to + 0.1 g. <br /> 10.1.3. Dry at 104°C for 16-20 hours recording the drying duration. Record final <br /> weight. <br /> Plato Malozemoff Technical Facility i Newmont Metallurgical Services <br /> The information contained in this report is confidential and proprietary. 3 <br />