NDLI: Invisible gold in Colombian auriferous soils

Content Provider	Springer Nature Link
Author	Bustos Rodriguez, H. Oyola Loza, D. Rojas Martínez, Y. A. Pérez Alcázar, G. A. Balogh, A. G.
Copyright Year	2006
Abstract	Optic microscopy, X-ray diffraction (XRD), Mössbauer spectroscopy (MS), Electron microprobe analysis (EPMA) and secondary ions mass spectroscopy (SIMS) were used to study Colombian auriferous soils. The auriferous samples, collected from El Diamante mine, located in Guachavez-Nariño (Colombia), were prepared by means of polished thin sections and polished sections for EPMA and SIMS. Petrography analysis was made using an optical microscope with a vision camera, registering the presence, in different percentages, of the following phases: pyrite, quartz, arsenopyrite, sphalerite, chalcopyrite and galena. By XRD analysis, the same phases were detected and their respective cell parameters calculated. By MS, the presence of two types of pyrite was detected and the hyperfine parameters are: δ 1 = 0.280 ± 0.01 mm/s and ΔQ 1 = 0.642 ± 0.01 mm/s, δ 2 = 0.379 ± 0.01 mm/s and ΔQ 2 = 0.613 ± 0.01 mm/s. For two of the samples MS detected also the arsenopyrite and chalcopyrite presence. The mean composition of the detected gold regions, established by EPMA, indicated 73% Au and 27% Ag (electrum type). Multiple regions of approximately 200 × 200 μm of area in each mineral sample were analyzed by SIMS registering the presence of “invisible gold” associated mainly with the pyrite and occasionally with the arsenopyrite.
Starting Page	605
Ending Page	611
Page Count	7
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	166
Issue Number	1-4
e-ISSN	15729540
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-11-03
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	invisible gold Mössbauer spectroscopy X-rays diffraction ions mass spectroscopy SIMS pyrite quartz arsenopyrite Surfaces and Interfaces, Thin Films Condensed Matter Atoms, Molecules, Clusters and Plasmas Nuclear Physics, Heavy Ions, Hadrons
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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