کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4430085 1619859 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Measurement of surface mercury fluxes at active industrial gold mines in Nevada (USA)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Measurement of surface mercury fluxes at active industrial gold mines in Nevada (USA)
چکیده انگلیسی

Mercury (Hg) may be naturally associated with the rock units hosting precious and base metal deposits. Active gold mines are known to have point source releases of Hg associated with ore processing facilities. The nonpoint source release of Hg to the air from the large area (hundreds to thousands of hectares) of disturbed and processed material at industrial open pit gold mines has not been quantified. This paper describes the field data collected as part of a project focused on estimating nonpoint source emissions of Hg from two active mines in Nevada, USA. In situ Hg flux data were collected on diel and seasonal time steps using a dynamic flux chamber from representative mine surfaces. Hg fluxes ranged from < 1500 ng m−2 day−1 for waste rock piles (0.6–3.5 μg g−1) to 684,000 ng m−2 day−1 for tailings (2.8–58 μg g−1). Releases were positively correlated with material Hg concentrations, surface grain size, and moisture content. Highest Hg releases occurred from materials under active cyanide leaching and from tailings impoundments containing processed high-grade ore. Data collected indicate that as mine sites are reclaimed and material disturbance ceases, emissions will decline. Additionally local cycling of atmospheric Hg (deposition and re-emission) was found to occur.

Research Highlights
► Mercury emissions were highest from the tailings and heap leached materials.
► Mercury releases will decline as mining activity ceases and surfaces are reclaimed.
► Material mercury concentration, moisture content and grain size influence emissions.
► Mercury deposited to mine surfaces can be re-emitted.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Science of The Total Environment - Volume 409, Issue 3, 1 January 2011, Pages 514–522
نویسندگان
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