We have studied the processes leading to the cementation of colloidal particles during their autonomous assembly on corroding copper electrodes within a Cu-Au galvanic microreactor. We determined the onset of particle immobilization through particle tracking, monitored the dissolution of copper as well as the deposition of insoluble products of the corrosion reactions in situ, and showed that p...

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...

the darreh-zar porphyry copper deposit, located in the urumieh – dokhtar magmatic belt, lies about 10 km southeast of sar-cheshmeh porphyry copper deposit. the ore body with hydrothermally altered zones including potassic, chlorite-sericite, sericite, argillic and propylitic all related to the darreh-zar porphyry stock intruded the eocene volcanic rocks. pyrite, chalcopyrite, molybdenite, with ...

This work deals with the planning and fabrication of a functionally gradient coppernickel composition via Laser Metal Deposition (LMD). Various compositions of copper and nickel were made by blending different weight percentages which were then sequentially deposited to fabricate functionally gradient copper-nickel thin-wall structures. Analyses were performed by sectioning the thin-wall sample...

A novel approach for direct electroless (EL) patterning of copper films without catalysts has been developed. In a special electroless solution employed in the present study, the formation of copper particles was observed and the negatively charged surfaces were confirmed by zeta potential measurements. The conditions of the solution (ionic strength, pH, temperature, additives etc.) greatly aff...

An areally extensive volcanic mass-flow deposit of Pleistocene age, known as the Chetaslina volcanic mass-flow deposit, is a prominent and visually striking deposit in the southeastern Copper River lowland of south-central Alaska. The mass-flow deposit consists of a diverse mixture of colorful, variably altered volcanic rocks, lahar deposits, glaciolacustrine diamicton, and till that record a m...

Its properties make copper one of the world’s most important functional metals. Numerous megatrends are increasing demand for copper. This requires prospection and exploration new deposits, as well monitoring quality in various production steps. A promising technique to perform these tasks is Laser Induced Breakdown Spectroscopy (LIBS). unique feature, among others, ability measure on site with...

sorkheh-dizaj apatite-iron oxide deposit is located 32 km southeast of zanjan. the area is situated within the tarom subzone of western alborz-azarbaijan structural zone. the oldest units at the sorkheh-dizaj area are eocene trachyte, trachyandesite, olivine basalt and volcanoclastic brecciate tuff and lapilli tuff which intruded by a quartz-monzonite, monzonite and granite subvolcanic pluton o...

The electrochemical deposition of copper is studied in polyaniline (PAN) layers with different redox states before the onset of metal deposition. Three characteristic oxidising peaks are found during dissolution of the copper deposit. Their charge contributions depend markedly on both thickness and the redox state of the polymer layers. The combined electrochemical, SEM and XPS studies allow to...