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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000150" target="_blank" >RIV/00025798:_____/21:00000150 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/21:10419422 RIV/60460709:41210/21:82084 RIV/61989592:15310/21:73608981

Result on the web

<a href="https://doi.org./10.1016/j.gexplo.2020.106658" target="_blank" >https://doi.org./10.1016/j.gexplo.2020.106658</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gexplo.2020.106658" target="_blank" >10.1016/j.gexplo.2020.106658</a>

Result language

angličtina

Original language name

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

Original language description

Mine tailings rich in Mn and an adjacent creek at Kanye, southeast Botswana, have been investigated by totaldecomposition of solids, X-ray diffraction, EMPA techniques, sequential extraction, and water leaching to understandbinding and mobility of Mn and other trace elements. The investigation revealed weathering of tailingsclose to the surface of the tailings and higher concentrations of Fe compared to Mn. There also are high concentrationsof Ba and Pb in the tailings solids. The principal minerals of Mn and Fe are cryptomelane, K(Mn4+,Mn2+)8O16, and hematite, Fe2O3, respectively. Most Mn is bound to less crystalline phases dissolved in thereducible step of sequential extraction, suggesting high potential for release of Mn and related trace elements.The situation is very different for Fe, which is found mostly in the residual (Aqua Regia) insoluble fraction. This isin a good agreement with high concentrations of mobilized Mn and with low concentrations of mobilized iron inthe water leaching test. The order of water-leached trace elements is Ba >; Zn >; As >; V >; Cu >; Co >; Pbwhere trace elements bound in Mn-oxyhydroxides are preferentially mobilized. In particular, As and V mayrepresent a potential risk for the environment during rainy periods when mine tailings are probably flooded, andtailings material is transported by water in an ephemeral creek. Currently, sediments in the creek are contaminatedat least to the boundaries of the Kanye settlement and they can be a source of groundwater contaminationduring the rainy period. Another possible source of contamination is wind transport and settling ofdust particles from mine tailings with

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Geochemical Exploration

ISSN

0375-6742

e-ISSN

—

Volume of the periodical

220

Issue of the periodical within the volume

January : 106658

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

11

Pages from-to

nestránkováno

UT code for WoS article

000594241200009

EID of the result in the Scopus database

2-s2.0-85092115935