A duplicate sample is an additional sample collected or prepared from the same material as an original sample to assess the precision and reliability of sampling and analytical procedures. In bauxite, gold, iron ore, and diamond exploration programs, duplicate samples form an important part of quality assurance and quality control (QA/QC) systems. They help identify variability introduced during sample collection, preparation, transportation, and laboratory analysis. Duplicate samples may be field duplicates, coarse duplicates, or pulp duplicates, depending on the stage at which they are generated. By comparing analytical results between original and duplicate samples, geologists can evaluate data quality and detect potential issues affecting accuracy. Reliable sampling is essential for resource estimation and decision-making. Duplicate sampling provides confidence that reported mineral grades accurately represent the deposit and supports compliance with international reporting standards.
