A significant contemporary challenge for gold mining companies is to define economic process options for treating more complex ore bodies as the less refractory ores become depleted. Demonstration of economic treatment options allows gold companies to maintain and increase their ore reserves. The selection of options to treat a specific ore is significantly impacted by factors such as mineralog...

Borax gold extraction has been carried out in the Philippines for over thirty years and presently around 15000 small-scale miners (ssm) use the method. Early 2010 the method was successfully tested in the Mbeya region of Southern Tanzania. In Ghana a recently completed EU funded project proved that the borax process worked on Ghanaian gold ores. A very successful teaching and training programme...

The productive mineralization of the Sheikhdzheili-Zengiboba area is associated with metamorphogenic transformations rocks Urusai, Karauzyak, Kuyanchik, Sheikhdzheili suites, metamorphosed under conditions green schist facies. mineralized zones site are confined to narrow faults in tectonic northeast and northwest directions. main form manifestation gold-bearing small steeply dipping veins, len...

The article presents the results of research on development processes and equipment for ore preparation pneumatic dry beneficiation mineral ores. methods crushing grinding before enrichment minerals have been considered, geomaterials is investigated. Highly efficient prototypes are developed tested: crushers multiple dynamic impact RD-MDV-900, DKD-300, centrifugal grinders CMVU-800 VCI-12, sepa...

Abstract Mining of “invisible gold” associated with sulfides in gold ores represents a significant proportion production worldwide. Gold hosted sulfide minerals has been proposed to be structurally bound the crystal lattice as sulfide-gold alloy and/or occur discrete metallic nanoparticles. Using combination microstructural quantification and nanoscale geochemical analyses on pyrite from an oro...

While gold partitioning into hydrothermal fluids responsible for the formation of porphyry and epithermal deposits is currently well understood, its behavior during differentiation metal-rich silicate melts still subject an intense scientific debate. Typically, scavenged sulfides crustal fractionation sulfur-rich mafic to intermediate magmas development native forms alloys this important precio...

Anthropogenic inventories for copper (229 ± 89 ug/cm2, N = 30), and mercury (470 ± 307 ng/cm2, N = 25) in Lake Superior sediments are much greater than inventories in remote lakes (Cu 50 ± 31 ug/cm2, Hg 64 ± 34 ng/cm2, N = 16) that receive inputs largely from long-distance atmospheric sources. Whereas the absolute concentration of mercury in Lake Superior sediments is not high (80–110 ng/g), en...