The increased rate of solubilization of sulfide ores of iron and copper caused by Thiobacillus ferrooxidans has been attributed either to direct action of the bacteria on the ore or to an indirect effect whereby the ferric ion is presumed to oxidize the ore and is returned to the active, oxidized state by the iron-oxidizing bacteria. Attempts by M. P. Silverman (3) to demonstrate that microbial...

Particle size, pH and Fe(III) ions affect the process of bioleaching of copper from chalcopyrite ores. In the study presented herein a copper sulfide ore was subjected to bioleaching process using a mixed microbial consortium obtained from a biotrickling filter treating high loads of H2S at different mineral particle size, distinct medium pH and various additional Fe(III) ion concentrations as ...

We provide results of a comprehensive mineralogical and microstructural study relict lherzolites the main ore field fresh rocks from deep structural borehole drilled in south-eastern part Kempirsay massif. Olivine orthopyroxene contain numerous pieces evidence material redistribution at different scales caused mainly by solid-state processes, such as plastic flow mantle, syntectonic recrystalli...