The elevated concentration of arsenic (As) in the groundwaters of many countries worldwide
has received much attention during recent decades. This article presents an overview of the …

Arsenopyrite (FeAsS) is the most common As-bearing sulfide mineral. Under oxidising
conditions, such as those in mine waste systems, it breaks down to release acids of As and …

Concentrations of naturally occurring arsenic in ground water vary regionally due to a
combination of climate and geology. Although slightly less than half of 30,000 arsenic …

Systems at the surface of the Earth are continually responding to energy inputs derived
ultimately from radiation from the Sun or from the radiogenic heat in the interior. These …

Iron is an essential micronutrient for most organisms due to its role in fundamental metabolic
processes. In cultivated soils, soil solution iron is mostly oxidized [Fe (III) species] unless …

Biomining is the use of microorganisms in the recovery of metals from ores. During
bioleaching, metals such as copper, nickel or zinc are oxidized through microbial action from …

Severe environmental pollution and resources waste were caused by tailings. For the sake
of making comprehensive utilization of tailings, tailings bioleaching for copper recovery and …

GENCOR SA Ltd. has pioneered the commercialization of biooxidation of refractory gold
ores. Development of the BIOX® process started in the late 197os at GENCOR Process …

Weathering of the As-rich pyrite-rich tailings of the abandoned mining site of Carnoulès
(southeastern France) results in the formation of acid waters heavily loaded with arsenic …

The mechanism of pyrite bioleaching has been studied through both the indirect action of
bacteria by recycling the leaching agent (Fe3+) and the direct attack of microbial cells …