Lateral, single-crystalline silicon nanowires were synthesized using chemical vapor deposition catalyzed by gold nanoparticles deposited on one of the vertical {1 1 1} sidewalls of trenches etched in Si(0 1 1) substrates. Upon encountering the opposing sidewalls of the trenches, the lateral nanowires formed a mechanically strong connection. The bridging connection at the opposing sidewall was o...

The ore mineralogy of a new promising target the Aldan–Stanovoy gold province—the Spokoininsky cluster—is considered. Gold mineralization is represented by volumetric, nonlinear type, unconventional for region; it related to elements fold structures and reverse fault in enclosing metamorphic basement rocks. Vein-disseminated sulfide–(pyrite)–quartz ores build up deposit-like bodies beresites fr...

A new approach is described for the recovery of precious metals (PMs: Au, Pd and Ag) with >99% efficiency from aqueous solution utilising biogas produced during the aerobic growth of Klebsiella pneumoniae. Gold was recovered from electronic scrap leachate ( approximately 95%) by this method, with some selectivity against Cu. The recovered PM solids all contained metal and sulphur as determined ...

A Life Cycle Inventory (LCI) was assembled for gold production extending from the formation of gold-ore deposits through the production of semi-refined gold-silver bullion. Inputs traditionally considered in life cycle assessment (LCA) such as energy, materials, and capital were counted along with geologic inputs and labor. Emergy, rather than traditional LCA methods, was used to make inventory...

Seven gold(I) N-heterocyclic carbene (NHC) complexes were synthesized, characterized, and identified as suitable precursors for focused electron beam-induced deposition (FEBID). Several variations on the core Au(NHC)X moiety introduced, that is, of NHC ring (imidazole or triazole), alkyl N-substituents (Me, Et, iPr), ancillary ligand X (Cl, Br, I, CF 3 ). The seven tested FEBID in an on-substra...

Poor partitioning of macromolecules into the holes of holey carbon support grids frequently limits structural determination by single particle cryo-electron microscopy (cryo-EM). Here, we present a method to deposit, on gold-coated carbon grids, a self-assembled monolayer whose surface properties can be controlled by chemical modification. We demonstrate the utility of this approach to drive pa...

The growing interest in Ghana’s gold mining sector due to the recent upsurge in the price of gold has impacted greatly on the economy of the country with regard to its revenue generation capacity. There is therefore the need to develop this sector. Hence, any new method which is relatively low cost and has comparable efficiency compared to prevailing conventional methods in delineating new pote...

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...

Ore-reserve estimations of deposits with low mineral concentrations, such as those of copper, gold and tin, are usually made on the assumption that the grades follow a lognormal distribution. Multiple mineralization or reworking of a deposit may have modified the simple distribution expected — producing an overall distribution of grades which can be adequately described by a mixture of lognorma...