Comparing-Sampling-Techniques-for-Gold-Bullion-Evaluation-AR25.pdf

1、COMPARING SAMPLING TECHNIQUES FOR GOLD BULLION EVALUATIONDEBORA SAMUEL17 MARCH 2025AGENDAAGENDAIntroduction&Theory ReviewMethodologyResultsConclusion Acknowledgement1 12 23 34 45 53INTRODUCTION&THEORY REVIEW4 4 Copyright 2019 Rand Refinery confidentialINTRODUCTION:GOLD BULLION EVALUATIONGold Bullion

2、 CompositionComplex compositions(gold,silver,copper)Varies across different depositsEvaluation ProcessImportance of Accurate SamplingFair financial settlementsAvoid financial losses due to biased samplingFinancial&Reputational ImpactInaccurate sampling damages reputationMaintaining transparency is k

3、ey5 5 Copyright 2019 Rand Refinery confidentialTHEORY OF SAMPLING(TOS)&SAMPLING ERRORS IN BULLION EVALUATIONPierre Gys Theory of sampling(TOS)Sampling accuracyHeterogeneity in sampling Sampling errors:source and typesSampling errors in gold bullionTHEORY REVIEW6 6 Copyright 2019 Rand Refinery confid

4、entialGOLD BULLION SAMPLING:A REFINERY CASE STUDYImpact of sampling on assay and gradesSampling affects grade and assaying accuracyErrors accumulate if not addressedEssential quality standards and controlsQuality standards minimize errorsStandards for sample extraction,preparation,and laboratory ana

5、lysisCase study:A test for assay varianceInvestigation of the effectiveness and validity of different sampling techniquesComparing Dip vs Drill sampling techniqueIdentifying the most accurate method for gold content determinationPurpose of the study and relevanceConducted at Rand Refinery,a gold lea

6、ding refineryImproving efficiency and ensuring complianceMore than accuracy financial integrity and efficiency7METHODOLOGY8 8 Copyright 2019 Rand Refinery confidentialMETHODOLOGY:SAMPLING Molten gold extracted using dipping iron samplerDips SamplingGraphite crucible used to extract molten and pour m