Biomining, the biotechnology that uses microorganisms to extract metals from ores and concentrates, is currently used exclusively for processing reduced ores and mine wastes. Metals of economic value also occur extensively in oxidized ores, such as nickel laterites. While these are not amenable to oxidative dissolution, the ferric iron minerals they contain can, in theory, be disrupted by iron ...

Andean Ores, having been approved in respect to style and intellectual content, is referred to you for judgment. We have read this thesis and recommend that it be approved. Lead isotope ratios of ores and igneous rocks in the Central and Southern Andes show a large-scale geographic pattern related to magmatic source processes. This pattern changes in the Northern Andes for reasons that are not ...

Lower Ordovician sandstones of the “Grès Armoricain” formation in Montlouis quarry near Janzé (Ille-et-Vilaine, France) display rare Fe-sulfide veins filled with a low-T (<300°C) assemblage pyrite, marcasite, “melnikovite”, trace amounts galena and sphalerite. Pyrite occur as contorted cm-scale columnar pyrite invading larger idiomorphic crystals coating vugs. It is usually overgrown by fibrora...

Abstract. The sulfidic waste dumps of the historical mining sites Giftkies and Kaňk (Czech Republic) have been exposed to a temperate climate over decades. This exposure generated low-pH conditions caused by metal sulfide decomposition. Tin sulfides stannite–kësterite series [Cu2(Fe,Zn)SnS4] are common Sn minerals in ores at investigated sites. They decompose under acidic oxidizing form situ se...