Gold particle clustering: A new consideration in sampling applications
Gold particle clustering: A new consideration in sampling applications
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金颗粒聚类：采样应用中的新考虑
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
I. M. Platten
中科院分区：
文献类型：
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作者：
S. Dominy;I. M. Platten
最近的研究表明，在某些金矿床中可能存在强化的粗粒金问题。这可能是由于金颗粒簇的存在，其产生单个粗金颗粒的效果并导致高组成异质性（CH）。这些簇可能分布在厘米级或更大的范围内，导致田间样品的测定变异性很高。然而，一旦子样品被粉碎，如果组成簇的单个金颗粒被释放，则簇的效果可以被去除。因此，除非存在真正的粗金颗粒，否则任何所得的浆料将倾向于具有低可变性。团簇在粗金矿床中很容易识别，它们突出了现有的高块金效应和CH。然而，团簇也可能出现在细金矿床中，它们产生明显的粗金风格。这是由变差分析的意外高块金效应和现场样品重复之间的相关性差发出的信号。应用戈伊采样方程模拟了具有成簇和非成簇金颗粒的粗、细金矿床。案例研究说明集群的观察效果。如果存在聚集颗粒，则在现场和早期实验室阶段进行适当的方案设计至关重要。样品表征阶段应包括对可能的金颗粒聚集的评估，以及对金颗粒尺寸分布的标准描述。
Recent research indicates that an enhanced coarse gold problem may be present in some gold deposits. This can be due to the presence of gold particle clusters that give the effect of individual coarse-gold particles and leads to a high constitution heterogeneity (CH). These clusters, which may be distributed on the centimetre-scale or greater, give rise to high assay variability in field samples. However, once a sub-sample is pulverised, the effect of the clusters may be removed if the individual gold particles making up the clusters are liberated. Thus any resulting pulp will tend to have a low variability, unless true coarse-gold particles exist. Clusters are readily recognised in coarse gold deposits where they accentuate existing high nugget effect and CH. Clusters may however also occur in fine gold deposits where they produce an apparent coarse gold style. This is signaled by an unexpectedly high nugget effect from variography and poor correlation between field sample duplicates. The Gy sampling equation is applied to model coarse and fine gold deposits with clustered and non-clustered gold grains. Case studies illustrating observed effects of clustering are presented. If clustered particles exist, then proper protocol design at the field and early laboratory stage is paramount. The sample characterisation stage should include an assessment of possible gold particle clustering, in addition to the standard descriptions of the gold particle size distribution.