This review describes the historical development and current state of metals leaching and sulfide mineral biooxidation by the minerals industries. During the past 20 years commercial processes employing microorganisms for mineral recovery have progressed from rather uncontrolled copper dump leaching to mineral oxidation and leaching in designed bioheaps for oxidation of refractory gold ores and...

T. J. Matthews ([email protected]), H. E. W. Cottee Jones and R. J. Whittaker, Conservation Biogeography and Macroecology Programme, School of Geography and the Environment, Univ. of Oxford, South Parks Road, Oxford, OX1 3QY, UK. TJM also at: CE3C – Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Univ. dos A ç ores –Depto de Ci ê ncias Agr á ri...

Purpose. Using experimental and theoretical studies to justify the rational location of charges various types their technological parameters in fan, taking into account physical mechanical properties structural features rocks mountain massif. Methodology. In experiments, an improved method geostructural analysis was used obtain detailed data on properties, block structure massif, type direction...

The concentrations, distribution, accumulation, and potential ecological risk of heavy metals (Cr, Cu, Zn, Ni, As, Pb, Cd, and Hg) in sediments from the Three Gorges Reservoir (TGR) tributaries were determined and studied. Pb isotopic compositions in sediments were also measured to effectively identify the potential Pb sources. The results showed that the average concentrations of heavy metals ...

The Kangjiawan deposit, in the Shuikoushan district, Hunan Province, China, is a representative hydrothermal Pb–Zn–Ag– Au deposit in this region. The orebodies consist mainly of pyritic Pb–Zn ores. Silver minerals are associated with Pb–Zn mineralization. Ag-bearing Pb–Zn ores in the deposit are characterized by Ag > Cu > Sb content. Silver occurs mainly as silver minerals, such as minor argent...

At the Clarabelle mill, significant amounts of rock minerals float inadvertently during nickel and copper sulfide flotation, causing poor concentrate grades. It is known that the rock minerals that report to the concentrates are amphiboles and phyllosilicates. However, the latter are found only on concentrates obtained by processing highly altered ores. The amphiboles, which occur as both prima...

Iron chrome oxide (FeCr 2O4), is a commercially viable and major ingredient of stainless steel. The Odisha state in India possesses 98% the pre-Cambrian India’s Chromite ore deposits Sukinda valley, Jajpur District. To meet present escalating demand for chromium steel industries, it urged to extract more satiate domestic needs. depletion deposits, rise demand, fewer mines, less conversion from ...

This review deals with applications of activation analysis to geological samples : , minerals and rocks . The various activation sources suitable for tb.is purpose are discussed. Applications using isotopic neutron sources are reviewed in some detail , those using neutron generators are discussed on a rrore general basis . Present trends in instrumental neutron-activation techniques are briefly...

The response of CR-39 nuclear track detector (TasTrak(®)) to protons in the energy range of 0.92-9.28 MeV has been studied. Previous studies of the CR-39 response to protons have been extended by examining the piece-to-piece variability in addition to the effects of etch time and etchant temperature; it is shown that the shape of the CR-39 response curve to protons can vary from piece-to-piece....

Heavy metals that pose a threat to the environment include lead (Pb), zinc (Zn), copper (Cu), arsenic (As), cadmium (Cd), chromium (Cr), nickel (Ni) and mercury (Hg). Biomonitoring of environmental quality using plants is widely accepted as reliable inexpensive way obtaining information on contamination also by heavy metals. It allows assessment direction changes in natural development prognose...