Mobility of Mn and other trace elements in Mn-rich mine tailings and adjacent creek at Kanye, southeast Botswana

Šráček, Ondra; Křı́bek, Bohdan; Mihaljevič, Martin; Ettler, Vojtěch; Vaněk, Aleš; Penížek, Vít; Veselovský, František; Bagai, Zibisani; Kapusta, Jaroslav; Sulovský, Petr

doi:10.1016/j.gexplo.2020.106658

Cited by 11 publications

(2 citation statements)

References 32 publications

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“…(3) High climatic requirements Under current technical conditions, DSDT is limited by regional precipitation. In rainy climate regions, flood discharge and leakage pollution control of DSDT TSFs have become major bottlenecks in the implementation of this technology [41,42].…”

Section: Disadvantages Of the Dsdt Schemementioning

confidence: 99%

Comparative Life Cycle Assessment of Conventional and Dry Stack Tailings Disposal Schemes: A Case Study in Northern China

et al. 2022

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Alternative tailings disposal technologies can be effective solutions to mining waste safety and environmental problems. The current decision-making processes for tailings disposal schemes lack consideration of environmental impacts. Based on a case study of an open-pit iron mine in northern China, this study adopted the life cycle assessment (LCA) method to compare the environmental impacts of three tailings disposal schemes of conventional slurry disposal technology (CSDT), dry stack disposal technology (DSDT) by belt conveyance and DSDT by truck transport. The results indicated that (1) the environmental impacts of the CSDT scheme were lowest under the premise that water consumption was ignored; (2) the environmental impacts of the DSDT scheme by belt conveyance mainly originated from its transport process, indicating that the tailings storage facilities (TSFs) site planning could be crucial in design decision making; (3) the environmental impacts of the DSDT scheme by truck transport mainly originated from the energy consumption of dry stacking equipment; and (4) the DSDT scheme by truck transport was eventually found to be preferable and implemented in the case study, after comprehensively considering the LCA results, TSF safety and remaining capacity, and social and policy uncertainties. It is therefore recommended to conduct LCA of environmental impacts in the decision-making process for the sustainable design of TSFs.

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Section: Disadvantages Of the Dsdt Schemementioning

confidence: 99%

Comparative Life Cycle Assessment of Conventional and Dry Stack Tailings Disposal Schemes: A Case Study in Northern China

et al. 2022

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“…As a result, SE is beneficial for quantifying and resolving the speciation of Fe mineral coatings in sediments. The technique has been applied to quantify Fe minerals in, for example, the sediment from mine-tailing wastes − and the Fe-/S-rich sediment. ,− In the SE processes, the mineral structure and pH significantly affect mineral recovery, which limits precision for targeted minerals in the sediment and increases uncertainty. , To overcome these limitations, extraction schemes, while based on established SE procedures, were designed to take into account kinetic limitations that extend the reaction time for each extraction (see Section ).…”

Section: Introductionmentioning

confidence: 99%

Assessing Reactive Iron Mineral Coatings in Redox Transition Zones with Sequential Extraction

Yin

Han

Dyer

et al. 2022

ACS Earth Space Chem.

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In reduction−oxidation (redox) transition zones (RTZs), reactive iron minerals play an important role in electron transfer between bacteria and contaminants. To better understand their contributions, this study focuses on characterizing iron mineral speciation using sequential extraction. Sediment samples were collected from an anoxic core where the redox condition was preserved. Based on previous analyses, four RTZs were of focus: the Upper Zone [3.96−4.52 m depth below the surface (DBS)], Zone 1 (6.35−6.91 m DBS), Zone 2 (9.45−10.46 m DBS), and Zone 3 (14.63−15.24 m DBS). A six-step sequential extraction (SE) was applied to discern reduced and oxidized forms of Fe mineral coatings in these four RTZs. Based on extraction results, in the Upper Zone, the amorphous Fe sulfide minerals, mackinawite and greigite, increased with depth, while the crystalline Fe sulfide, pyrite, decreased. Because metastable mackinawite was dominant in the Upper Zone and given historical contamination at the site, the absence of volatile organic compounds in the sediment headspace suggests (a)biotic attenuation may be significant. In the Zone 1, the highest concentrations of crystalline Fe sulfide mineral nano-coatings were observed when compared to other three RTZs; importantly, sulfate-reducing bacteria, Desulfosporosinus, was abundant. Fe concentrations in the sediment dramatically decreased in Zone 2, where the Fe(II/III) mineral magnetite was dominant, suggesting a biogenic pathway as iron-reducing bacteria, Geobacter, was abundant. In the aquifer to aquitard interface Zone 3, Fe mineral coatings revealed significant variability between each subsample, suggesting active Fe cycling with biotic processes based on the abundance ofDesulfosporosinusin the clay lenses. Iron speciation with respect to mineralogy [and therefore Fe(II) and Fe(III) forms] in RTZs further supports evidence of (a)biotic contributions in natural attenuation.

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Characterization and Statistical Multivariate Analysis of Potentially Toxic Elements Contamination of Groundwater in Chiniot Area, Punjab Plain, Pakistan

Yoshida,

Ahmad,

Sultana

2023

Environmental Science and Engineering

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Mobility of Mn and other trace elements in Mn-rich mine tailings and adjacent creek at Kanye, southeast Botswana

Cited by 11 publications

References 32 publications

Comparative Life Cycle Assessment of Conventional and Dry Stack Tailings Disposal Schemes: A Case Study in Northern China

Comparative Life Cycle Assessment of Conventional and Dry Stack Tailings Disposal Schemes: A Case Study in Northern China

Assessing Reactive Iron Mineral Coatings in Redox Transition Zones with Sequential Extraction

Characterization and Statistical Multivariate Analysis of Potentially Toxic Elements Contamination of Groundwater in Chiniot Area, Punjab Plain, Pakistan

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