Desulfurization is a novel approach for the reclamation of abandoned mine sites that can have environmental and economic benefits, particularly when combined with the recovery of valuable elements. Desulfurization by flotation produces sulfide-lean tailings, which can be used as cover materials,...

The Raigorodok stockwork gold-sulfide-quartz deposit is located in the contact zone of a monzogabbro-diorite intrusion belonging to the Stepnyak complex (442 Ma). Two main ore formation stages have been established: early, with disseminated gold-bearing pyrite-chalcopyrite mineralization related...

In this study, we have developed a facile, rapid one-pot strategy for synthesis of orange fluorescent gold nanoclusters (MBISA–AuNCs) at room temperature by using 2-Mercapto-5-benzimidazolesulfonic acid (MBISA) as both reducing and protecting reagent. The prepared AuNCs exhibited prominent adva...

Recently, leaching of gold with cyanide has come under scrutiny for its possible detrimental effects to the environment. Also, in some gold bearing ores and concentrates, conventional cyanide leaching is not the best method for gold extraction. This is due to gold particle encapsulation, cyanici...

In this study, wire is made of nanometer flash-gold (Au) film deposited onto the surface of Ag-2.5 wt% Pd-1.5 wt% Au wire (APA wire), denoted as AAPA wire. The flash-Au film increases the resistance to chlorination and sulfidation of the silver (Ag) alloy wire, which is susceptible to deteriorat...

The Zhengguang gold deposit, a typical intermediate-sulfidation epithermal deposit, is located in the southeastern part of the Duobaoshan orefield, west of the Hegenshan-Heihe suture zone, in the eastern part of the Central Asian Orogenic Belt. The deposit comprises five ore zones with total Au ...

In the present study we describe the synthetic strategies to gold(I)-selenolate complexes by the reaction of ortho-substituted diaryl diselenides and electrophilic anti-arthritic gold(I)-compounds in the presence of thiol such as PhSH. Diselenides react with thiol to generate a mixture of seleno...

In this study, the forms of silver occurrence and behaviour during extraction from primary gold–sulphide deposits in the carboniferous strata of the Arctic zone of Russia are analysed. Detailed mineralogical and technological studies reveal that the silver is concentrated in tetrahedrites, wher...

Nickel hydroxide undergoes profound structural transformations under prolonged potential cycling in alkaline solutions. In this work, gold film electrodes modified with different nickel hydroxide coverages were subjected to continuous potentiodynamic cycling in alkaline medium, while the simulta...

A novel non-enzymatic electrochemical sensor based on gold nanoparticles/nicke hydroxide nanosheet (AuNPs/Ni(OH)2 NS) nanocomposite was successfully fabricated and further used for glucose sensing. The morphology and composition of AuNPs/Ni(OH)2 NS were characterized by scanning electron microsc...

Potassium hydroxide alkaline pretreatment of a refractory gold–silver ore containing 20 g/t Au and 220 g/t Ag was investigated with the purpose to evaluate its effectiveness on the extraction of gold and silver. The presence of antimony minerals such as stibnite (Sb2S3), zinkenite (Pb9Sb22S42) ...

We assessed the efficacy of Ca-bentonite (CB) alone and combined with Ca-hydroxide (CH), tobacco biochar (TB), and zeolite (ZL) aiming to immobilize Cu and Pb and decrease their bioavailability and uptake by pak choi followed by maize in a mining contaminated soil. The CB alone was able to decre...

At the Hardrock Archean orogenic gold deposit, Geraldton, Canada, a correlation was found in drill core samples between the mass of elements lost on ignition (LOI) and gold concentration, and it was demonstrated that the measured LOI was in fact controlled by chlorite. The reason why LOI and gol...

In this study, a non-enzymatic glucose sensor (NEGs) based on the electrochemical deposition of nickel nanoparticles on screen-printed electrodes modified with gold nanoparticles, Ni(OH)2/AuNp/SPE, is obtained. SEM and XPS measurements, and electrochemical performance reveal synergist effects of...

The separation of gold and vanadium in the refractory carbonaceous gold ore had been performed by one-step roasting method. The thermodynamic viability of the possible reactions in the process was analyzed based on thermodynamic data. And the effects of experimental parameters such as roasting t...

A simple and rapid approach to synthesize monodisperse and biocompatible gold nanoparticles (AuNPs) employing dextran as a reducing and stabilizing agents at different reaction conditions was described. The obtained dextran-gold nanoparticles (Dex-AuNPs) were characterized by transmission electr...

Simultaneous cyclic voltammetry (CV) and surface resistance (SR) measurements were employed to study the electrochemical behaviour of the nickel hydroxide-gold modified electrode. To this end, firstly, gold film electrodes of different thicknesses were synthesized, and their CV and SR responses ...

We have developed a controllable method for high density of ultrafine gold nanoparticles (NP) and their uniform aggregates on exfoliated nanosheet of layered double hydroxide (LDH). The LDH nanosheet effectively supports the growth of ultrafine gold NP because the freshly exfoliated hydroxide pr...

This work deals with the theoretical investigation of the vibrational spectra of the As2S5−xSex (from x=0 to x=5 modes of glassy alloys) type compounds. Molecular geometries and vibrational spectra of all their conformers were calculated quantum chemically. Normal coordinate analysis was carried...

It has been shown that it is possible to determine arsenic, molybdenum m tellurium in tlic presence of mercury by decomposing in one portion the thiosalt of mercury alone with ammonium acetate and in another portion the thioaalts of both the metals with hydrochloric acid.