Hydrothermal mineral deposits are the primary source of many commodities global importance. Since hydrothermal alteration minerals associated with formation these active in visible and infrared range, analysis spectral absorption features can be used to identify mineralogy different events. Some events responsible for occurrence commodities, while other create unrelated introduction base precio...

The article deals with the application of fuzzy logic approach to stage precipitation aluminum hydroxide from sodium aluminate solutions obtained alkaline solution raw alunite by hydrogen peroxide as an eco-friendly reagent. Factors influencing in presence H2O2 poor include concentration peroxide, volume and other parameters. this process allows calculating probabilities that parameters can occ...

Jarosite, beudantite and alunite are members of the supergroup. Minerals like those have been detected in different environments on Earth. These jarosite-type compounds common acid rock drainage sulfate soils, resulting from weathering sulfide ores; they also present bioleaching systems because found cultures iron-oxidizing microorganisms. Jarosite is generated hydrometallurgical circuits, main...

The jarosite family of minerals are part the alunite supergroup with general formula AB3(TO4)2(OH)6. Jarosite known to incorporate silver (Ag), but extent which this occurs, and at what temperature range, is not well constrained. To address knowledge gap, compounds A site filled K, Na, Ag H3O were synthesised 22 °C, 97 °C 140 simulate low-, moderate- high-temperature environments, respectively....

Abstract. The Martabe gold deposits in Sumatra formed a shallow crustal epithermal environment associated with intermediate mafic intrusions adjacent to an active right-lateral wrench system. Gas/fluid temperatures reached 200–350 ∘C. structural geology suggests episodic switches stress orientations during Plio-Pleistocene seismotectonic evolution. Different mineralisation events may have been ...

Twenty nine samples of silica sinter, ranging in age from modern to Miocene, record temporal changes in both mineralogy and texture. When ®rst deposited, sinters consist largely of noncrystalline spheres (<1±8 lm diameter) of opal-A exhibiting varying degrees of closepacking. Particle densities range from 1.5 to 2.1 g cm, total water 4±10 wt%, and porosities 35±60%. Changes over 10,000 years fo...