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1995, G. Morteani & P. Northover (Eds.), Prehistoric Gold in Europe
The gold deposits of Verespatak belong to the famous 'Golden Quadrangle' (Romania). They have probably been exploited since ancient times. In order to obtain more detailed compositional information, native gold samples were analysed by WDS and NAA. The results show that the gold from Verespatak has typically very high silver contents in the order of 20-25% and also contains tellurium and other trace elements in the matrix and bound to mineral inclusions. Melting experiments under oxidizing and reducing conditions showed that copper and tellurium contained in the gold were hardly affected. Thus copper contents of up to 0.4% and tellurium contents of up to 0.2% can occur in this gold type. Such high tellurium contents have so far not been found in prehistoric gold objects from the region.
NATO ASI Series E Applied Sciences-Advanced Study Institute
The composition of gold from the ancient mining district of Verespatak/Rosia Montana, Romania1995 •
Author: Hauptmann, A.; Rehren, Thilo; Pernicka, Ernst Editor: Northover, Jeremy Peter; Morteani, Giulio Title Article/Chapter: The composition of gold from the ancient mining district of Verespatak/Rosia Montana, Romania" Title of Source: Prehistoric gold in Europe: mines, metallurgy, and manufacture Title of Series: NATO ASI series. Series E, Applied sciences (vol. ...
Carpathian Journal of …
The geochemical signature of native gold from Roşia Montană and Musariu ore deposits, Metaliferi Mts (Romania); Preliminary data2009 •
"For the last 2000 years gold has been mined in the Southern Apuseni Mountains in Romania from both primary (hydrothermal) and secondary (river placer) deposits. The gold-bearing area covers about 900 km2 and represents the richest Au-Ag province in Europe. The ore originating from the Southern Apuseni Mountains is known as “Transylvanian gold”. The hydrothermal deposits studied here are associated with Neogene volcanism and classify as intermediate- to low-sulphidation epithermal type. We studied sixteen samples from nine occurrences, i.e., Roşia Montană, Boteş, Vâlcoi, Căraci, Musariu, Măgura, Săcărâmb, Trestia, and Techereu with electron microprobe analyses (EMPA). Three elements were identified in these samples, with the following mean values: Au – 71.13 wt%, Ag – 28.33 wt% and Te – 0.15 wt%. They vary significantly more than shown in previous studies. Composition ranges from Au-rich silver (Au0.43Ag0.57) to gold (Au0.79Ag0.21). The compositional heterogeneity is documented at various scales: within the Southern Apuseni Mountains region, within one ore deposit (e.g., Roşia Montană, Vâlcoi-Corabia) or even within a single sample (Trestia occurrence). Tellurium concentration up to 0.34 wt% is one of the highest found in Transylvanian gold. The studied gold samples outline a specific pattern with relatively high Ag and significant Te content compared with previously published data on primary gold from Southern Apuseni Mountains and various other deposits outside Romania. This pattern can be considered as typical geochemical signature for Transylvanian gold. These findings on major Transylvanian gold deposits represent sound information for further provenancing studies of ancient gold objects. The consistency of the electron microprobe data and their general availability in laboratories around the world are great advantages compared with those obtained by more sophisticated methods."
physicsegypt.org
SOME APPLICATIONS OF X-RAY BASED ELEMENTAL ANALYSIS METHODS FOR ROMANIAN GOLD MINERALS STUDIESRomanian Reports in Physics
SOME APPLICATIONS OF X-RAY BASED ELEMENTAL ANALYSIS METHODS FOR STUDIES ON ROMANIAN GOLD MINERALS2010 •
Geological characterization of native gold – primary and alluvial – is very important for gold archaeological objects authentication. The values of ratios between native gold alloy main components (Au-Ag-Cu) as well as some traces elements (Sn, Te, Sb, Hg, Pb, Platinum Group Elements – PGE) – “fingerprints” for Transylvanian mines and placers – are used to determine the provenance of ancient gold items found on Romanian territory. Two samples – polished sections – from Rosia Montana and Musariu ore deposits were investigated using complementary analytical techniques: X-Ray Fluorescence (XRF), micro – Proton Induced X-Ray Emission (micro-PIXE), micro-Synchrotron Radiation induced X-Ray Fluorescence (micro - SR-XRF). Results concerning Au-Ag-Cu native alloy composition, the presence of specific trace elements as Te, Sb, Sn, but also associated minerals – quartz and metallic sulfides – are presented.
Journal of Archaeological Science
Lead isotope analyses of gold–silver ores from Roşia Montană (Romania): a first step of a metal provenance study of Roman mining activity in Alburnus Maior (Roman Dacia)2011 •
AbstrAct Using energy dispersive X-ray fluorescence spectrometry the content of gold, silver and copper in 7 gold breast plates dated to 5 th-4 th century BC and preserved in National Archaeological Institute with Museum to Bulgarian Academy of Sciences was determined. The concentration of gold is between 67.4 and 92.2%. The analytical results show that the investigated archaeological finds of gold are produced using gold without intentional adding of copper – in 2 samples copper concentration is below 0.001% and in other 5 is between 0.35 and 1.15%. The concentration of silver in 5 of the investigated finds is between 20.1 and 32.3%, which could be accepted as electrum. The concentration of silver in other 2 finds was 15% and 6%. The chemical composition of the investigated gold-finds from ancient Thracе was compared with the analytical data about chemical composition of known gold sources from Balkan region.
Nuclear Instruments and …
Compositional studies on Transylvanian gold nuggets: Advantages and limitations of PIXE-PIGE analysis2008 •
European Journal of Education and Pedagogy
Setback to and Encouragement of Feedback: Teacher and Student Perspectives2021 •
The research explored setback to, and encouragement of feedback as perceived by teachers and students. Three research questions guided the study. The population of the study constituted 180 teachers and 3200 students in government owned secondary schools in Ekwusigo L.G.A of Anambra State. Simple random sampling technique was used to draw the sample of teachers and students. Two questionnaires, one for teachers and one for students were used to collect data. Arithemetical mean was used in answering the research questions. The results revealed that all the stipulated factors constituted setbacks to teachers in giving feedback to their students. All the teachers indicated that all the listed items can encourage them in giving feedback to their students. Also, almost all the items except one constituted setback for the students in receiving feedback from their teachers. It was recommended that workload of teachers should be moderate, and the teacher should be relieved of other duties t...
St. Pierre & Miquelon Philatelic Journal
St. Pierre & Miquelon Philatelic Journal 2009 v 15 n 1-42009 •
James R. Taylor, Editor
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Agriculture & Food Security
Factors affecting sustainability of community food security projects in Kiambu County, Kenya2013 •
Risco: Revista de Pesquisa em Arquitetura e Urbanismo (Online)
A problemática socioambiental na formação do arquiteto: perspectivas e desafios apontados por um estudo do currículo de um curso de arquitetura e urbanismo2008 •
Journal of Applied Non-Classical Logics
Probabilistic logic under coherence, model-theoretic probabilistic logic, and default reasoning in SystemP2002 •
Material Cycles and Waste Management Research
Medium- and Long-term Prospects of Material flow for Rare-metal Resources2011 •
HAYATI Journal of Biosciences
Three Species of Ectoparasite Mites (Acari: Pterygosomatidae) Infested Geckos in Indonesia2013 •
Malaria Journal
Anopheles farauti is a homogeneous population that blood feeds early and outdoors in the Solomon Islands2016 •
2017 •
Journal of Seismology
The MIKHNEVO small aperture array enhances the resolution property of seismological observations on the East European Platform2011 •
2018 •
PROBLEMS OF SYSTEMIC APPROACH IN THE ECONOMY
Integration of Persons with Restricted Opportunities to Society: Foreign and Domestic Experience2019 •