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Mineralogical analysis of auriferous ores from the El Diamante mine, Colombia

Bustos Rodriguez, Humberto ; Oyola Lozano, Dagoberto ; Rojas Martínez, Yebrayl A. ; Pérez Alcázar, Germán A. ; Flege, Stefan ; Balogh, Adam G. ; Cabri, Louis J. ; Tubrett, Michael (2007)
Mineralogical analysis of auriferous ores from the El Diamante mine, Colombia.
In: Hyperfine Interactions, 175 (1-3)
doi: 10.1007/s10751-008-9603-2
Article, Bibliographie

Abstract

X-ray diffraction (XRD), Mössbauer spectrometry (MS), secondary ions mass spectroscopy (SIMS) and laser-ablation microprobe–inductively coupled plasma–mass spectrometry (LAM–ICP–MS) were used to study mineral samples of Colombian auriferous ores collected from the “El Diamante” mine, located in the municipality of Guachavez-Nariño, in Colombia. The samples were prepared as polished thin sections and polished sections. From XRD data, quartz, sphalerite and pyrite were detected and their respective cell parameters were estimated. From MS analyses, pyrite, arsenopyrite and chalcopyrite were identified; their respective hyperfine parameters and respective texture were deduced. Multiple regions of approximately 200 × 200 μm in each sample were analyzed with SIMS; the occurrence of “invisible gold” associated mainly with pyrite and secondarily with arsenopyrite could thus be assigned. It was also found that pyrite is of the arsenious type. Spots from 30 to 40 μm in diameter were analyzed with LAM–ICP–MS for pyrite, arsenopyrite and sphalerite; Au is “homogeneously” distributed inside the structure of the arsenious pyrite and the arsenopyrite (not as inclusions); the chemical composition indicates similarities of this “invisible gold”, forming a solid solution with arsenious pyrite and arsenopyrite. One hundred nineteen and 62 ppm of ‘invisible gold’ was quantified in 21 spots analyzed on pyrite and in 14 spots on arsenopyrite, respectively.

Item Type: Article
Erschienen: 2007
Creators: Bustos Rodriguez, Humberto ; Oyola Lozano, Dagoberto ; Rojas Martínez, Yebrayl A. ; Pérez Alcázar, Germán A. ; Flege, Stefan ; Balogh, Adam G. ; Cabri, Louis J. ; Tubrett, Michael
Type of entry: Bibliographie
Title: Mineralogical analysis of auriferous ores from the El Diamante mine, Colombia
Language: English
Date: February 2007
Publisher: Springer Netherlands
Journal or Publication Title: Hyperfine Interactions
Volume of the journal: 175
Issue Number: 1-3
DOI: 10.1007/s10751-008-9603-2
Abstract:

X-ray diffraction (XRD), Mössbauer spectrometry (MS), secondary ions mass spectroscopy (SIMS) and laser-ablation microprobe–inductively coupled plasma–mass spectrometry (LAM–ICP–MS) were used to study mineral samples of Colombian auriferous ores collected from the “El Diamante” mine, located in the municipality of Guachavez-Nariño, in Colombia. The samples were prepared as polished thin sections and polished sections. From XRD data, quartz, sphalerite and pyrite were detected and their respective cell parameters were estimated. From MS analyses, pyrite, arsenopyrite and chalcopyrite were identified; their respective hyperfine parameters and respective texture were deduced. Multiple regions of approximately 200 × 200 μm in each sample were analyzed with SIMS; the occurrence of “invisible gold” associated mainly with pyrite and secondarily with arsenopyrite could thus be assigned. It was also found that pyrite is of the arsenious type. Spots from 30 to 40 μm in diameter were analyzed with LAM–ICP–MS for pyrite, arsenopyrite and sphalerite; Au is “homogeneously” distributed inside the structure of the arsenious pyrite and the arsenopyrite (not as inclusions); the chemical composition indicates similarities of this “invisible gold”, forming a solid solution with arsenious pyrite and arsenopyrite. One hundred nineteen and 62 ppm of ‘invisible gold’ was quantified in 21 spots analyzed on pyrite and in 14 spots on arsenopyrite, respectively.

Uncontrolled Keywords: Mössbauer; Invisible gold; SIMS; XRD; LAM–ICP–MS; Pyrite; Arsenopyrite
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Material Analytics
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 24 Jun 2009 08:58
Last Modified: 05 Mar 2013 09:20
PPN:
Funders: We are grateful to the Central Research Committee of the University of Tolima and COLCIENCIAS, for the financial support; to the GMTF of University of Valle, Colombia, where part of the experimental work was conducted;, to the Institute forMaterials Science of the Darmstadt University of Technology, Darmstadt, Germany, for the SIMS analysis of mineral samples and to Memorial University of Newfoundland (MUN), Canada for the LAM–ICP–MS analysis.
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