Introduction: We have used a variety of techniques – TEM, synchrotron – as part of the UK Stardust consortium in order to identify and constrain the origin of oxides and thus demonstrate some affinities between Wild 2 and other planetary materials such as chondrite groups or IDPs. We are finding that oxidised phases in Wild 2 have a variety of origins. Studying Fe-bearing oxide phases in the St...

Nowadays, refractory gold ore production around the world accounts for about 30% of total production, and low leaching rate such concentrate seriously limits efficient utilization resources. The alkaline preoxidation process can improve this kind deposit has good development application prospects. Therefore, it is great significance to study oxidation dissolution behavior pyrite in an environme...

Aided phytostabilization using a combination of compost, zerovalent iron grit and coal fly ash (CZA) amendments and revegetation effectively promoted the biological recovery of mining spoils generated at a gold mine in Portugal. Selective dissolution of spoil samples in combination with solid phase characterization using microbeam X-ray absorption near edge structure (μXANES) spectroscopy and m...

The major problem with Carlin-type gold deposit flotation is that the high dolomite content in concentrate decreases quality of gold. Further, activation mechanisms involved are still not fully understood. Herein, correlation Fe2+ conversion xanthate adsorption and was investigated to reveal effect embedded pyrite. Flotation tests suggested rather than Fe3+ improved floatability from 20% 45%. C...

The Zarshuran Carlin-like gold deposit is located at the Takab Metallogenic belt in the northern part of the Sanandaj-Sirjan zone, NW Iran. The high-grade ore bodies are mainly hosted by black shale and cream to gray massive limestone along the NNE-trending extensional fault/fracture zones. The aim of this investigation was to determine and separate the gold mineralized stages based on the surf...

High-resolution aberration-corrected electron microscopy was performed on a series of catalysts derived from a parent material, 2 at.% Au/Fe(2)O(3) (WGC ref. no. 60C), prepared by co-precipitation and calcined in air at 400 degrees C, and a catalyst prepared by leaching surface gold from the parent catalyst and exposed to various treatments, including use in the water-gas shift reaction at 250 ...

 Background: This research studied the feasibility of a simple method for extracting gold from central processing units (CPUs) of computer circuit boards without solvent. Methods: Ceramic and composite CPUs of computer circuit boards were used. Gold was extracted using a hydrometallurgical method in six stages: grinding of CPUs, leaching in nitric acid, leaching in aqua regia, remov...

A mineralogical and mineral chemistry study was carried out in the San Luis Alta telluride-rich gold deposit, mid-south Peru, to contribute towards determining its formation improving ore processing. The mineralization is considered an intrusion-related deposit located Arequipa segment of Coastal Batholith. occurs quartz veins hosted diorites granodiorites from Tiabaya Super-Unit. These are sul...

We exploit the strong plasmon resonance of gold nanoparticles in the catalytic decomposition of CO to grow various forms of carbonaceous materials. Irradiating gold nanoparticles in a CO environment at their plasmon resonant frequency generates high temperatures and strong electric fields required to break the CO bond. By varying the laser power, exposure time, and gas flow rate, we deposit amo...