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
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
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DOI：
10.1016/j.ringeo.2020.100003
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发表时间：
2020-11
影响因子：
5.6
通讯作者：
E. Klein;M. Krekeler
中科院分区：
文献类型：
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作者：
E. Klein;M. Krekeler
由于小规模滑石矿的运营时间较短（约1至10年），同行评审文献中对其矿物学和地球化学的详细描述有限。蒙大拿州杨柳溪矿的1497号样品的研究采用扫描电子显微镜后向散射检测法（SEM-BSD），表明存在一个复杂的次要矿物组合。汞硒硫矿物与石墨共生，锌铬镍矿物和钍矿物分散在滑石基质中。值得注意的是，Hg、Se、Zn、Cr和Ni与人类健康有关。含有这些元素的矿物直径约为20至0.4微米，并且都有PM10或PM2.5粒度级的例子。这些矿物质在滑石矿加工过程中可能不会分离出来，并且可能会被吸入。结果表明，需要详细的SEM-BSD调查的历史滑石产品从杨柳溪矿和调查矿石从类似的设置在蒙大拿州。
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 PM10or PM2.5size 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.