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4.3 Metering pump or constant head device to insure constant rate extraction fluid application <br /> 4.4 Extraction fluid (influent) and effluent containers sufficient in size to contain liquid used during <br /> extraction. Containers must be covered to avoid possible contamination from sources outside the test <br /> apparatus. <br /> 4.5 Laboratory balance capable of weighing to 1.0 g. <br /> 4.6 Drying pans or dishes for moisture content determinations. <br /> 4.7 pH meter with a readability of 0.01 units and an accuracy of t0.05 units at 25°C. <br /> 4.8 Filtration assembly device of a composition suitable to the nature of the analyses to be performed and <br /> equipped with a 0.45 pm pore size filter.An assembly for prefiltration or centrifugation may be required if <br /> 0.45 pm filtration is difficult. <br /> 4.9 Tubing -surgical or Tygon tubing sufficient in diameter and length for the extraction device assembly <br /> (pump, column effluent outlet). <br /> 5. Reagents <br /> 5.1 Water, Type II reagent grade-Water purified by distillation, ion exchange, reverse osmosis, <br /> electrodialysis, or a combination thereof, conforming to the specifications for Type II reagent grade water <br /> 6. Sampling (Field) <br /> 6.1 Field sampling should be accomplished to insure a representative mine rock sample is obtained. <br /> 6.2 The minimum quantity of mine rock sample required for the MWMP is 5 kg.At least 7 kg of mine rock <br /> sample should be submitted to the laboratory for feed moisture content determination, MWMP, and other <br /> potential analyses requested by the submitting company. Mine rock samples of up to 25 kg are <br /> appropriate for submittal. <br /> 6.3 It is important that the mine rock sample be representative with respect to surface area, as variations <br /> in surface area may directly affect the leaching characteristics of the sample. Mine rock samples should <br /> contain a representative distribution of particle sizes. <br /> 6.4 Keep samples in closed containers (bags, buckets) appropriate to sample type and analysis for <br /> transport to the laboratory. <br /> 7. Sample Preparation (Laboratory) <br /> 7.1 Remove mine rock sample from the container and blend by coning or rolling and obtain sample for <br /> feed moisture content(approximately 1 kg). <br /> 7.2 Screen remainder(5 kg or more)on a 5 cm (2 inch) screen. Save minus 5 cm material for subsequent <br /> recombination with crushed plus 5 cm material. <br /> 7.3 After screening, weigh plus and minus 5 cm screened materials and calculate plus and minus 5 cm <br /> weight distributions. <br />