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The importance of assay method and accuracy - a scandium case study

机译：测定方法和准确性的重要性 - 一种钪案例研究

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For resource evaluation, assay accuracy is critical, whereas precision can consider or be offset by sampling density. In quality assurance and quality control (QAQC) analysis, the assessment of the selected assaying method and its accuracy is often overlooked. Umpire samples provide an opportunity to test alternative assaying method outcomes and accuracy. However, often umpire sampling programs only demonstrate reproducible results for the same assay method at a different laboratory.If certified using a different assaying method, then certified reference materials (CRMs) can help to verify an assay method for accuracy. However, all commercial CRMs raise questions regarding the suitability of the CRM mineral matrix and the certification assay method. Work performed by Platina Resources Limited (Platina) on their scandium project in New South Wales (NSW), provides some insight into these issues with the comparison of Inductively Coupled Plasma (ICP) and X-ray Fluorescence (XRF) analytical data. It demonstrates typical small assaying accuracy issues for Ni and Co in nickel laterites, as well as significant inaccuracy when analysing for Sc in scandium rich laterite deposits.Platina refocused their QAQC work on accuracy, and this paper provides several valuable learnings: All tested assay methods by ICP were biased low for Sc, to at least some extent, and are not considered accurate. Alternative method assays were hidden by the structure and implementation of the commercial database and overlooked initially. Lack of focus on absolute accuracy undermined an otherwise well-executed QAQC process. A few umpire assays by alternative methods can be more valuable than all the other QAQC samples. CRMs are not a measure of accuracy but a measure of relative performance against a group of laboratories using the same assay method. Use of internally sourced matrix-matched standards can be invaluable in the QAQC process. These learnings have relevance to all mineral projects, as it is common for QAQC programs to focus on precision and performance without fully exploring assaying accuracy.
机译：对于资源评估，测定精度至关重要，而精度可以通过采样密度考虑或抵消。在质量保证和质量控制（QAQC）分析中，往往忽略了所选测定方法的评估及其准确性。裁判示例提供了测试替代测定方法结果和准确性的机会。然而，通常umpire采样程序仅在不同的实验室中展示相同的测定方法的可重复结果。如果使用不同的测定方法认证，则经过认证的参考资料（CRM）可以帮助验证测定方法以获得精度。然而，所有商业CRM都提出了关于CRM矿物基质的适用性的问题和认证测定方法。 Platina Resources Limited（Platina）在新南威尔士（新南威尔士州）的钪项目上进行的工作，并在与电感耦合等离子体（ICP）和X射线荧光（XRF）分析数据的比较中对这些问题进行了一些洞察力。它展示了镍底镍和CO的典型小型测定准确性问题，以及在富含钪中的SC分析SC时的显着不准确性。预应于其QAQC的准确性，本文提供了几种有价值的学习：所有测试的测定方法通过ICP向SC偏置低，至少在某种程度上，并且不被认为是准确的。通过商业数据库的结构和实施隐藏的替代方法测定并最初被忽略。缺乏专注于绝对准确性，破坏了否则执行的QAQC进程。通过替代方法的一些裁判测定可以比所有其他QAQC样品更有价值。 CRM不是准确性的衡量标准，而是使用相同的测定方法对一组实验室的相对性能的衡量标准。在QAQC过程中使用内部源矩阵匹配标准可能是非常宝贵的。这些学习与所有矿产项目有关，因为QAQC计划很常见，以重点关注精度和性能，而无需完全探索测定准确性。

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