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

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

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...

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Bibliographic Details
Published in:Hyperfine interactions Vol. 175; no. 1-3
Main Authors: Bustos Rodriguez, Humberto, Oyola Lozano, Dagoberto, Rojas Martínez, Yebrayl A., Pérez Alcázar, Germán A., Flege, Stefan, Balogh, Adam G., Cabri, Louis J., Tubrett, Michael
Format: Journal Article
Language:English
Published: Dordrecht Springer Nature B.V 01-02-2007
Subjects:
Arsenopyrite
Chalcopyrite
Chemical composition
Emission spectroscopy
Gold
Inclusions
Inductively coupled plasma mass spectrometry
Laser ablation
Mass spectrometry
Minerals
Parameter estimation
Parameter identification
Pyrite
Scientific imaging
Solid solutions
X-ray diffraction
Zincblende
Colombia
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Summary: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.
ISSN:0304-3843
1572-9540
DOI:10.1007/s10751-008-9603-2