Results 51 to 60 of about 2,099 (197)
(Rare types of tetrahedrite-tennantite ores of a gold ore deposit.
, 2020 These sulphosalts occur as: 1) tiny segregations in sphalerite, galena and pyrite; 2) thin veinlets cutting these minerals; 3) rims on these minerals and 4) irregular intergrowths with chalcopyrite. Probe analyses of 23 grains shows that the Zn contents of these tetrahedrites and tennantites range 0.2-8.1%, with the Zn per formula unit often >1. Almost
Borisova E.A. +2 more
openaire +1 more source
River Research and Applications, EarlyView.ABSTRACT Tropical rivers play a key role in regional carbon budgets, yet greenhouse gas (GHG) dynamics in regulated systems remain poorly understood. This study investigates the seasonal variability of carbon dioxide (CO2) and methane (CH4) concentrations, isotopic composition (δ13C), and river‐atmosphere fluxes in the lower Tocantins River, a ...
Maria Gabriella da S. Araújo +5 more
wiley +1 more source
Известия высших учебных заведений: Геология и разведка, 2015 Today we have a huge problem with prospecting new gold-ore deposits and its estimation on deep horizonts, especially in the closed territory. Often we used “analogy” method to make a decision.
M. Yu. Malykh
doaj +2 more sources
Sustainable Development, EarlyView.ABSTRACT Illegal gold mining has emerged as a major sustainability threat in the Amazon, eroding Indigenous rights, forest integrity, and climate mitigation efforts. This study examines how international market incentives relate to the expansion of illegal mining and associated deforestation within the Yanomami Indigenous Territory (YIT) from 2008 to ...
Shirléia Lago Santos +2 more
wiley +1 more source
RUDN Journal of Engineering Research, 2016 The relevance of the discussed issue is caused by the need to detect a new gold ore deposits within the Yenisei ridge to replenish the mineral resources of gold ore in Russia.
R Kh Mansurov
doaj
Acid Resistant and Highly Silver Selective Membranes Based on Charged Nanoporous 2D‐Materials
Small, EarlyView.In this work, new membranes based on charged & nanoporous nanosheets with unprecedented selectivity to silver versus a wide range of other metallic ions are reported. Furthermore, a demonstrated and lead specific intralamellar lead pathway is demonstrated. A potential applicability for ubiquitous silver in WEEE is validated.
Sarah M. Chevrier +6 more
wiley +1 more source
Forces Behind South Australia's Unusual Structural Changes Since 1840
Australian Journal of Agricultural and Resource Economics, EarlyView.ABSTRACT The agricultural sector's share of GDP in growing economies typically declines but, for a century from the early 1850s, Australia's did not. That trend is most evident for the former colony and now State of South Australia (SA). Moreover, that share for SA has been almost flat since 1980 as well, along with the agricultural sector's share of ...
Kym Anderson
wiley +1 more source
GOLD FORMATIONS OF THE PRIAMURSKAYA PROVINCE
Известия высших учебных заведений: Геология и разведка, 2016 It was found that within the Priamurskaya prov-nce of Late Me-ozoic age the depos-ts and occurrences of gold-quartz are wide-pread, and goldsulphide-quartz, goldsilver and goldpolymetallic formations are less popular.
V. A. Stepanov, A. V. Melnikov
doaj +1 more source
The British Journal of Sociology, EarlyView.ABSTRACT Using biographical methods, the study explores the lives of 34 young people undertaking engineering apprenticeships in Teesside, Northeast England. It examines why working‐class youth in a deindustrialised region might be attracted to engineering, how they might secure apprenticeship, and the invaluable role households play in orchestrating ...
Anoop Nayak, Graham Gaunt
wiley +1 more source
Archaeometry, EarlyView.ABSTRACT Geochemical analysis of five brooch types from the Lower Rhine area dated to the last century bc and first century ad is used to constrain resource use, exchange and mobility. Lead isotope ratios demonstrate an Iberian provenance for copper in bronze Late Iron Age brooches.
A. A. T. Ruiter +4 more
wiley +1 more source