Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore

Autores
Shuster, Jeremiah; Lengke, Maggy; Marquez Zavalia, Maria Florencia; Southam, Gordon
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
A gold-bearing ore from the San Salvador vein, Capillitas mine, Argentina, was exposed to an enriched, iron- and sulfur-oxidizing bacterial consortium for two months in an experimental system that represented an oxidized, acid-leached weathering environment. Within this laboratory model, the dissolution of metal sulfide minerals by the bacterial consortium liberated gold grains that floated on water. Surficial crevices on grains contained detrital material associated with μm-scale, gold-rich bacteriomorphic structures interpreted to be relics of gold dissolution. The presence of nanophase gold particles, i.e., colloids and octahedral platelets, was attributed to gold reprecipitation. These secondary gold structures suggest that gold dissolution/reprecipitation, i.e., cycling, was occurring concurrently with the bacterially catalyzed dissolution of metal sulfides. The flake-like morphology and small size of gold grains, i.e., high surface area to volume ratio increased by μm-scale surface dissolution textures, would have enhanced their propensity to float. The liberation of buoyant gold grains and secondary gold particles could contribute to rapid gold mobility and dispersion in natural environments.
Fil: Shuster, Jeremiah. University of Queensland; Australia
Fil: Lengke, Maggy. Western University; Canadá
Fil: Marquez Zavalia, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Southam, Gordon. University of Queensland; Australia
Materia
Floating gold grains
Nanophase particles
Biogeochemical weathering
Gold bearing ore
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/183141
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing oreShuster, JeremiahLengke, MaggyMarquez Zavalia, Maria FlorenciaSoutham, GordonFloating gold grainsNanophase particlesBiogeochemical weatheringGold bearing orehttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1A gold-bearing ore from the San Salvador vein, Capillitas mine, Argentina, was exposed to an enriched, iron- and sulfur-oxidizing bacterial consortium for two months in an experimental system that represented an oxidized, acid-leached weathering environment. Within this laboratory model, the dissolution of metal sulfide minerals by the bacterial consortium liberated gold grains that floated on water. Surficial crevices on grains contained detrital material associated with μm-scale, gold-rich bacteriomorphic structures interpreted to be relics of gold dissolution. The presence of nanophase gold particles, i.e., colloids and octahedral platelets, was attributed to gold reprecipitation. These secondary gold structures suggest that gold dissolution/reprecipitation, i.e., cycling, was occurring concurrently with the bacterially catalyzed dissolution of metal sulfides. The flake-like morphology and small size of gold grains, i.e., high surface area to volume ratio increased by μm-scale surface dissolution textures, would have enhanced their propensity to float. The liberation of buoyant gold grains and secondary gold particles could contribute to rapid gold mobility and dispersion in natural environments.Fil: Shuster, Jeremiah. University of Queensland; AustraliaFil: Lengke, Maggy. Western University; CanadáFil: Marquez Zavalia, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Southam, Gordon. University of Queensland; AustraliaSociety of Economic Geologists2016-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/183141Shuster, Jeremiah; Lengke, Maggy; Marquez Zavalia, Maria Florencia; Southam, Gordon; Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore; Society of Economic Geologists; Economic Geology and the Bulletin of the Society of Economic Geologists; 111; 6; 10-2016; 1485-14940361-01281554-0774CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/segweb/economicgeology/article/111/6/1485/152499/Floating-Gold-Grains-and-Nanophase-Particlesinfo:eu-repo/semantics/altIdentifier/doi/10.2113/econgeo.111.6.1485info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T14:52:46Zoai:ri.conicet.gov.ar:11336/183141instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 14:52:47.19CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
title Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
spellingShingle Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
Shuster, Jeremiah
Floating gold grains
Nanophase particles
Biogeochemical weathering
Gold bearing ore
title_short Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
title_full Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
title_fullStr Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
title_full_unstemmed Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
title_sort Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore
dc.creator.none.fl_str_mv Shuster, Jeremiah
Lengke, Maggy
Marquez Zavalia, Maria Florencia
Southam, Gordon
author Shuster, Jeremiah
author_facet Shuster, Jeremiah
Lengke, Maggy
Marquez Zavalia, Maria Florencia
Southam, Gordon
author_role author
author2 Lengke, Maggy
Marquez Zavalia, Maria Florencia
Southam, Gordon
author2_role author
author
author
dc.subject.none.fl_str_mv Floating gold grains
Nanophase particles
Biogeochemical weathering
Gold bearing ore
topic Floating gold grains
Nanophase particles
Biogeochemical weathering
Gold bearing ore
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv A gold-bearing ore from the San Salvador vein, Capillitas mine, Argentina, was exposed to an enriched, iron- and sulfur-oxidizing bacterial consortium for two months in an experimental system that represented an oxidized, acid-leached weathering environment. Within this laboratory model, the dissolution of metal sulfide minerals by the bacterial consortium liberated gold grains that floated on water. Surficial crevices on grains contained detrital material associated with μm-scale, gold-rich bacteriomorphic structures interpreted to be relics of gold dissolution. The presence of nanophase gold particles, i.e., colloids and octahedral platelets, was attributed to gold reprecipitation. These secondary gold structures suggest that gold dissolution/reprecipitation, i.e., cycling, was occurring concurrently with the bacterially catalyzed dissolution of metal sulfides. The flake-like morphology and small size of gold grains, i.e., high surface area to volume ratio increased by μm-scale surface dissolution textures, would have enhanced their propensity to float. The liberation of buoyant gold grains and secondary gold particles could contribute to rapid gold mobility and dispersion in natural environments.
Fil: Shuster, Jeremiah. University of Queensland; Australia
Fil: Lengke, Maggy. Western University; Canadá
Fil: Marquez Zavalia, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
Fil: Southam, Gordon. University of Queensland; Australia
description A gold-bearing ore from the San Salvador vein, Capillitas mine, Argentina, was exposed to an enriched, iron- and sulfur-oxidizing bacterial consortium for two months in an experimental system that represented an oxidized, acid-leached weathering environment. Within this laboratory model, the dissolution of metal sulfide minerals by the bacterial consortium liberated gold grains that floated on water. Surficial crevices on grains contained detrital material associated with μm-scale, gold-rich bacteriomorphic structures interpreted to be relics of gold dissolution. The presence of nanophase gold particles, i.e., colloids and octahedral platelets, was attributed to gold reprecipitation. These secondary gold structures suggest that gold dissolution/reprecipitation, i.e., cycling, was occurring concurrently with the bacterially catalyzed dissolution of metal sulfides. The flake-like morphology and small size of gold grains, i.e., high surface area to volume ratio increased by μm-scale surface dissolution textures, would have enhanced their propensity to float. The liberation of buoyant gold grains and secondary gold particles could contribute to rapid gold mobility and dispersion in natural environments.
publishDate 2016
dc.date.none.fl_str_mv 2016-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/183141
Shuster, Jeremiah; Lengke, Maggy; Marquez Zavalia, Maria Florencia; Southam, Gordon; Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore; Society of Economic Geologists; Economic Geology and the Bulletin of the Society of Economic Geologists; 111; 6; 10-2016; 1485-1494
0361-0128
1554-0774
CONICET Digital
CONICET
url http://hdl.handle.net/11336/183141
identifier_str_mv Shuster, Jeremiah; Lengke, Maggy; Marquez Zavalia, Maria Florencia; Southam, Gordon; Floating gold grains and nanophase particles produced from the biogeochemical weathering of a gold-bearing ore; Society of Economic Geologists; Economic Geology and the Bulletin of the Society of Economic Geologists; 111; 6; 10-2016; 1485-1494
0361-0128
1554-0774
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/segweb/economicgeology/article/111/6/1485/152499/Floating-Gold-Grains-and-Nanophase-Particles
info:eu-repo/semantics/altIdentifier/doi/10.2113/econgeo.111.6.1485
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Society of Economic Geologists
publisher.none.fl_str_mv Society of Economic Geologists
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1846083056591437824
score 13.22299

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