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<br />iABLE 1 ACID MINE DRAINeGE PREDICTION TECINIOUES <br />lESi DESCRIPTION USE ADVANTAf~ES DISADYPMPGES EfFEREhC1:S <br />STATIC TESTS <br />1. Acid/Base -Potential acidity is calculated fran extensively used - simple to use -difficult to interpret 8, 9 <br />Atcounting total or pyritic wlfur analysis. in coal fields of -low cost per sample if potential acidity and <br /> - Neutralization potential 1s obtained Appalachia USA -large rxnber of sartples neutralization <br /> by adding a krorm amurrt of HCl and can be tested to obtain potential are in balance <br /> titratina with standardized NaOH to estimate of variability -does not consider pos- <br /> pH 7. in acid production Bible different rates of <br /> - Potential acidity is wbtracted fr+on potential acid producing and can- <br /> reutralization potential. A negative -results in short time Boning reactions <br /> value below 5 tonnes CaC0,1/1000 tonnes -differences in particle <br /> of rock indicates a potential acid size rot reflected <br /> producer. <br />2. B.C. Research -Acid producing potential is calculated extensively used - as above - as above 10, 11 <br />Initial Test fran total sulfur analysis. for base metal <br /> - Acid consunirg ability is obtained by and gold mines in <br /> titrating with standardized wlfuric Canada <br /> acid to pH 3.5. ' <br /> - Acid prodxing potential is wbtracted <br /> from acid consuming ability. A nega- <br /> tive value indicates a potential acid <br /> pnxlKer. <br />KINETIC TESTS <br />3. B.C. Research - Sa~ple planed in 250 ml Erlenmeyer frequently used -relatively simple to -bacteria may rot be 10, 11 <br />Confirmation with 70 ml nutrient media, culture of for base metal use acclimated to sample <br />Test T. ferrr~idans at pk+ 2.2-2.5. and gold mines f -relatively 'row ~ - maybe aifificuit rv rn- <br /> - F1 ask placed on gyratory shaker at Canada - assessment of potential tr_rprpt if di does not <br /> 35°C in COZ enriched atrrosphere. for biological leaching strongly rise or fall <br /> - pN monitored and additional sample -does not model initial <br /> added. PND prodixtion step <br /> <br />CONTINJED... <br />