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Refining fine fraction soil extraction methods and analysis for mineral exploration

机译：精炼细部分土壤提取方法及矿产勘探分析

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Soils are widely used as geochemical sample media. In transported cover, the soils that host the mobile element signature are the smallest size fractions, so we should consider concentrating the clay size fraction (<2 mu m) as an improved sample medium. Twenty-seven bulk reference soils were collected in the vicinity of known mineral deposits (including background areas) that reflect common soil types of Western Australia. A selection of these soils was used in replicate testing to assess differences in particle size, sample weight, dispersants, and how this relates to the Au and Cu geochemistry. Using multiple analysis of variance tests, the submicron fractions showed that, although the <0.2 mu m fraction was slightly different to the <2 mu m and <0.75 mu m fractions, there was no additional value in the extra effort required to extract these submicron fractions, and the <2 mu m fraction was favoured. Ultrasonics and rinsing were not required for Au analysis, and during wet separation no Au is lost in solution and only a small fraction of the overall Cu (0.5%) is lost. Using a dispersant was critical for solid recovery and Na-hexametaphosphate (technical or laboratory grade) was found to be the most effective reagent. The <2 mu m size fraction showed no significant differences for assays of Au using 0.1, 0.2, 0.5, 1 and 4 g (P < 0.05) with a microwave-assisted aqua regia digestion being the best analytical method for Au recovery. In addition to the geochemistry, the spectral reflectance variation was investigated with respect to particle size and weight, and showed more variation in the smaller weight fraction of material and a loss of quartz in the fine materials as expected. The integration of results from this study generated a new workflow called UltraFine+(TM). This workflow provides 40 elements, spectral mineralogy, particle-size distribution, pH, electrical conductivity (EC) and specific surface area, offering more quality data to improve mineral exploration using soil and regolith samples.
机译：土壤广泛用作地球化学样本介质。在运输的盖子中，托管移动元素特征的土壤是最小的尺寸分数，因此我们应该考虑将粘土尺寸分数（<2μm）浓缩为改进的样品培养基。收集了二十七个散装参考土壤，在重新的矿物沉积物（包括背景领域）附近，反映了西澳大利亚普通土壤类型。在复制测试中使用这些土壤的选择以评估粒径，样品重量，分散剂的差异以及涉及Au和Cu地球化学的差异。利用多种方差试验分析，亚微米级分表明，尽管<0.2μm馏分与<2μm和<0.75μm馏分略有不同，但在提取这些亚微米所需的额外努力中没有额外的价值级分，并且<2μm级分有利。 Au分析不需要超声波和漂洗，并且在湿法中，溶液中丢失不损失Au，并且仅丢失整个Cu（0.5％）的小部分。使用分散剂对于固体回收至关重要，发现Na-六磷酸盐（技术或实验室等级）是最有效的试剂。 <2μm尺寸的分数显示使用0.1,0.2,0.5,1和4g（P <0.05）的Au测定没有显着差异，微波辅助Aqua Regia消化是Au恢复的最佳分析方法。除了地球化学之外，还研究了粒度和重量的光谱反射率变化，并在较小的材料重量分数和预期的细材料中显示出更多的变化。本研究中的结果集成了一个名为Ultrafine +（TM）的新工作流程。该工作流提供40个元素，光谱矿物学，粒度分布，pH，电导率（EC）和特定表面积，提供更多的质量数据，以改善使用土壤和鲁代样品的矿物探索。

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