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Automated Indicator Mineral Analysis of Fine-Grained Till Associated with the Sisson W-Mo Deposit, New Brunswick, Canada
Minerals ( IF 2.5 ) Pub Date : 2021-01-21 , DOI: 10.3390/min11020103
H. Lougheed , M. McClenaghan , Daniel Layton-Matthews , Matthew Leybourne , Agatha Dobosz

Exploration under thick glacial sediment cover is an important facet of modern mineral exploration in Canada and northern Europe. Till heavy mineral concentrate (HMC) indicator mineral methods are well established in exploration for diamonds, gold, and base metals in glaciated terrain. Traditional methods rely on visual examination of >250 µm HMC material. This study applies mineral liberation analysis (MLA) to investigate the finer (<250 µm) fraction of till HMC. Automated mineralogy (e.g., MLA) of finer material allows for the rapid collection of precise compositional and morphological data from a large number (10,000–100,000) of heavy mineral grains in a single sample. The Sisson W-Mo deposit has a previously documented dispersal train containing the ore minerals scheelite, wolframite, and molybdenite, along with sulfide and other accessory minerals, and was used as a test site for this study. Wolframite is identified in till samples up to 10 km down ice, whereas in previous work on the coarse fraction of till it was only identified directly overlying mineralization. Chalcopyrite and pyrite are found up to 10 km down ice, an increase over 2.5 and 5 km, respectively, achieved in previous work on the coarse fraction of the same HMC. Galena, sphalerite, arsenopyrite, and pyrrhotite are also found up to 10 km down ice after only being identified immediately overlying mineralization using the >250 µm fraction of HMC. Many of these sulfide grains are present only as inclusions in more chemically and robust minerals and would not be identified using optical methods. The extension of the wolframite dispersal train highlights the ability of MLA to identify minerals that lack distinguishing physical characteristics to aid visual identification.

中文翻译:

加拿大新不伦瑞克省Sisson W-Mo矿床相关的细粒耕作的自动化指标矿物分析

在厚厚的冰川沉积物覆盖下进行勘探是加拿大和北欧现代矿物勘探的重要方面。在冰川化地区勘探金刚石,黄金和贱金属方面,耕种重矿物精矿(HMC)指示剂矿物方法已被广泛确立。传统方法依靠目视检查> 250 µm HMC材料。这项研究应用矿物释放分析(MLA)来研究HMC之前的细颗粒(<250 µm)。较精细材料的自动矿物学(例如MLA)可从单个样品中的大量(10,000-100,000)重矿物颗粒中快速收集精确的成分和形态数据。Sisson W-Mo矿床有一个先前记录的分散矿床,其中含有矿石矿物白钨矿,黑钨矿和辉钼矿,以及硫化物和其他辅助矿物质,并被用作本研究的测试地点。在直到冰块以下10 km的耕层样品中都可以识别黑钨矿,而在以前的研究中,仅在直接覆盖矿化的粗粒部分才发现。黄铜矿和黄铁矿在距冰10 km处发现,分别比以前在同一HMC的粗粒部分上的工作增加了2.5 km和5 km。方铅矿,闪锌矿,毒砂和黄铁矿也被发现在距冰10公里以下的冰层中,仅在使用大于250 µm的HMC成分立即被识别为覆盖矿化层之后。这些硫化物晶粒中的许多仅以夹杂物形式存在于化学性质更强的矿物中,无法通过光学方法鉴定。
更新日期:2021-01-21
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