The occurrence of Hg, Se, S, Ni, Cr, and Th in Talc Ore: A scanning electron microscopy (SEM) study of historical samples from the Willow Creek Mine, Montana

Results in Geochemistry Pub Date : 2020-09-01 DOI:10.1016/j.ringeo.2020.100003

Ethan Klein , Mark P.S. Krekeler

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引用次数: 1

Abstract

Due to short timeframes over which small-scale talc mines operate (approximately 1 to 10 years), detailed characterization of their mineralogy and geochemistry in the peer-reviewed literature is limited. Investigation of sample 1497 of the Willow Creek Mine, Montana by scanning electron microscopy using back scatter detection (SEM-BSD) indicates a complex minor mineral assemblage. Hg-Se-S minerals are associated with graphite whereas Zn-Cr-Ni minerals and Th minerals are dispersed in the talc matrix. Notably, Hg, Se, Zn, Cr, and Ni are of human health concern. Minerals with these elements are ~ 20 to 0.4 µm in diameter, and all have examples in the PM₁₀ or PM_2.5 size fraction. These minerals would likely not be separated out during processing of talc ore and would be inhalable. Results indicate a need for detailed SEM-BSD investigations of historic talc products from the Willow Creek Mine and for investigating ore from similar settings in Montana.

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滑石矿中Hg、Se、S、Ni、Cr和Th的赋存状态:蒙大拿柳溪矿历史样品的扫描电镜研究

由于小型滑石矿的运营时间很短(大约1到10年)，同行评审的文献中对其矿物学和地球化学的详细描述是有限的。利用扫描电子显微镜(SEM-BSD)对美国蒙大拿州柳溪矿1497号样品进行了后向散射探测，发现样品中微量矿物组合较为复杂。Hg-Se-S矿物与石墨伴生，Zn-Cr-Ni矿物和Th矿物分散在滑石基质中。值得注意的是，汞、硒、锌、铬和镍对人体健康有影响。含有这些元素的矿物直径为~ 20 ~ 0.4µm，在PM10或PM2.5中都有例子。在滑石矿的加工过程中，这些矿物质很可能不会被分离出来，而且是可吸入的。结果表明，需要详细的SEM-BSD调查历史滑石产品从柳溪矿和调查矿石从蒙大拿州类似的设置。

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Results in Geochemistry

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