Identification of processes in Cu-ore heap leaching using Cu isotopes and leachate chemistry at Tschudi mine, northern Namibia

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41210%2F24%3A98433" target="_blank" >RIV/60460709:41210/24:98433 - isvavai.cz</a>

Alternative codes found

RIV/00025798:_____/24:10169209 RIV/00216208:11310/24:10487035 RIV/61989592:15310/24:73627211

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0304386X24000963" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0304386X24000963</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.hydromet.2024.106356" target="_blank" >10.1016/j.hydromet.2024.106356</a>

Result language

angličtina

Original language name

Identification of processes in Cu-ore heap leaching using Cu isotopes and leachate chemistry at Tschudi mine, northern Namibia

Original language description

Copper isotopic fractionation (in ?65Cu) and leachate characterization were studied in the context of heap leaching at the Tschudi copper mine in northern Namibia. The leached solution is of Mg-SO4 type with high Al and Fe concentrations. The source of Mg and Al in the leachate can be from the alteration of micas such as Mg-bearing muscovite confirmed by X-ray diffraction and scanning electron microscopy; however, the source of Mg cannot be determined with certainty. The principal secondary minerals identified in the leached ore are gypsum and jarosite. The value of pH in leachate is ~1.21 and the concentration of dissolved Cu, occurring mostly as CuSO40 and Cu2+, is about 2 g/L. In comparison with unleached ore (avg. ?65Cu -1.47 ‰), leached ore exhibits lighter isotopic values (avg. ?65Cu -6.01 ‰) with apparent isotopic fractionation ?65Culeached ore-unleached ore of about -4.54 ‰. In contrast, there is isotopic enrichment of leachate in heavier 65Cu isotope (leachate ?65Cu 0.34 ‰) with apparent isotopic fractionation ?65Culeachate-unleached ore value of +1.81 ‰. These results are in good agreement with Cu isotopic fractionation and depletion in heavier 65Cu isotope reported for dissolution experiments in laboratory and groundwater linked to the porphyry copper ore deposits around the world. The leaching of heaps can be considered an analogy of upper part of gossans, but here the supergene enrichment zone is missing due to extremely low pH and oxidizing conditions.

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

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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

2024

Confidentiality

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

Name of the periodical

HYDROMETALLURGY

ISSN

0304-386X

e-ISSN

0304-386X

Volume of the periodical

228

Issue of the periodical within the volume

OCT 2024

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

8

Pages from-to

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UT code for WoS article

001268725200001

EID of the result in the Scopus database

2-s2.0-85197817592