A pre-treatment method for upgrading gold from a polymetallic gold-zinc-lead ore by flotation was studied. X-ray diffraction analysis of the sulfide showed that quartz, calcite, pyrite, sphalerite, and galena are main constituents ore. The composition contained 6.49 ppm Au, 3.48% Zn, 1.25% Pb, 17.98% Fe, 20.36% S. Due to complexity ore, recovery is generally low. objective this study develop pr...

The Caledonian orogenic belt of northern Britain hosts some significant quartz vein-hosted gold deposits. However, as in orogenic belts worldwide, the relationship between gold mineralization and regional tectonics, magmatism, and metamorphism is a matter of debate. This is primarily due to the absence of precise temporal constraints for the mineralization. Here we report high-precision 40Ar/39...

New occurrences of free gold were identified during fieldwork at outcrops located in the western part of the Castro Basin, state of Paraná. These are associated with silicified and sulfide-rich zones in hydrothermally-altered volcanic rocks. The aerogeophysical data indicate that the areas of the new targets show high K and eU relative to eTh, suggesting intense hydrothermal alteration. The str...

The western segment of the suture zone between Yangtze and Cathaysia blocks, which is most important tectonic boundary related to formation rifting south China, enigmatic not fully understood due sporadic exposure Precambrian strata ophiolites. Three-dimensional electrical resistivity models derived from inversion magnetotelluric data identified a lithospheric-scale conductive extending northea...

Mineralogical features of placer gold and gold-sulfide ore occurrences the Sololi river basin from uplift Olenek arch have been studied. According to typomorphic indicators, two types are distinguished. The first type is a tabular lumpy shape, often with mineral indentation imprints. inner structure represented by granulation, recrystallization, high-grade intergranular veins, shells typical in...

This study deals with application of artificial neural networks (ANNs) on grade control at mine sites inputting both geological and geotechnical variables. Case study is Chapada copper-gold deposit (Goiás, Brazil), located in the neoproterozoic Chapada-Mara Rosa volcano-sedimentary sequence. Ore is closely related to hydrothermal alteration, structurally controlled. The geological and geotechni...

Metamorphic processes play a key role in forming orogenic gold deposits. In this paper, we present new evidence that host schists of the two largest deposits Yenisey ridge (Russia) Olympiada and Eldorado underwent single stage metamorphism contrast to surrounding blocks. This is moderate thermal gradient belongs Barrovian type, which typical for collisional event time range 800–850 Ma. The Ar/A...

Abstract Gold-containing ore processing technology has been developed by using chemical, X-ray phase, mineralogical, fluorescence analyses. The results of experiments on the gold recovery from a concentrate with particle size 10 and 4 µm are presented, including options for direct cyanidation without preliminary oxygen oxidation, as well use oxidation Trichloroisocyanuric acid (TCCA) Sulfanol s...