干旱区生态环境知识资源中心(Arid): Seasonal fluctuations and geochemical modeling of acid mine drainage in the semi-arid Puna region: The Pan de Azucar Pb-Ag-Zn mine, Argentina

Arid

DOI	10.1016/j.jsames.2021.103197
	Seasonal fluctuations and geochemical modeling of acid mine drainage in the semi-arid Puna region: The Pan de Azucar Pb-Ag-Zn mine, Argentina
	Murray, Jesica; Kirk Nordstrom, D.; Dold, Bernhard; Kirschbaum, Alicia
通讯作者	Murray, J (corresponding author), Univ Nacl Salta, CONICET, Inst Bio & Geo Ciencias Noroeste Argentino IBIGEO, Salta, Argentina.
来源期刊	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN	0895-9811
EISSN	1873-0647
出版年	2021
卷号	109
英文摘要	Pan de Azucar is an inactive Pb-Ag-Zn mine in the semi-arid Puna region of NW Argentina at 3600 m above sealevel. The mine is situated in Los Pozuelos basin, which is a UNESCO Biosphere Reserve. Substantial pyrite and few carbonate minerals are present in the tailings. The generated acid mine drainage (AMD) has low pH (1.92-4.06) and is mainly Fe-Zn-SO4 type water with high concentrations of metals that in order of relative abundance vary as: Al >> Cd > As(T) > Ni > V > Cu > Co > Sb > Cr > Pb > Sn > Ag. The strong annual cycle of dry and wet seasons in the Puna generates a significant influence on AMD geochemistry. In the dry season, there is no runoff and AMD drains mainly in the form of seepages with low pH (1.92-2.21), high concentrations of metals, and the formation of metal-rich soluble efflorescent salts is favored by strong evaporation. At the beginning of the wet season, the efflorescent salts rapidly dissolve and metals concentrations in AMD increase significantly, creating the most hazardous period for the surrounding fluvial environment. At the end of the wet season the pH increases (3.44-4.06) and the concentration of metals decreases, especially arsenic associated with ferric iron precipitates. As a consequence of the DC3 dam restoration, a large volume of AMD is retained forming an acid pond, in which processes of AMD mixing, secondary minerals precipitation, and sulfide oxidation were quantified by inverse modeling with mixing. Jarosite and schwertmannite precipitates in the surface of the pond and favors the attenuation of As and Pb. However, subaqueous oxidation of sulfide minerals, hydrolysis of silicates, and mixing with upstream AMD seepage increases the concentrations of SO42-, Fe(II), and the other metals in the seepage of the pond that migrates downstream. The results of this study indicate the necessity to improve the remediation methods of Pan de Azucar mine. It is expected that other sulfide mines in the Puna region will have a similar variability of the AMD geochemistry, which should be considered for mine closure, remediation, and monitoring of water quality in mining.
英文关键词	Acid mine drainage Tailings impoundments Puna Seasonal variation Geochemical modeling
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000670285900001
WOS关键词	HYDROGEOCHEMICAL PROCESSES ; MINING DISTRICT ; TRACE-ELEMENTS ; SCHWERTMANNITE ; IRON ; TAILINGS ; JAROSITE ; LAKE ; ALTIPLANO ; EVOLUTION
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368589
作者单位	[Murray, Jesica; Kirschbaum, Alicia] Univ Nacl Salta, CONICET, Inst Bio & Geo Ciencias Noroeste Argentino IBIGEO, Salta, Argentina; [Kirk Nordstrom, D.] US Geol Survey, Boulder, CO USA; [Dold, Bernhard] Sustainable Min Res & Consultancy SUMIRCO, San Pedro De La Paz, Biobio, Chile; [Dold, Bernhard] Pontifical Catholic Univ Peru PUCP, Lima, Peru
推荐引用方式 GB/T 7714	Murray, Jesica,Kirk Nordstrom, D.,Dold, Bernhard,et al. Seasonal fluctuations and geochemical modeling of acid mine drainage in the semi-arid Puna region: The Pan de Azucar Pb-Ag-Zn mine, Argentina[J]. United States Geological Survey,2021,109.
APA	Murray, Jesica,Kirk Nordstrom, D.,Dold, Bernhard,&Kirschbaum, Alicia.(2021).Seasonal fluctuations and geochemical modeling of acid mine drainage in the semi-arid Puna region: The Pan de Azucar Pb-Ag-Zn mine, Argentina.JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,109.
MLA	Murray, Jesica,et al."Seasonal fluctuations and geochemical modeling of acid mine drainage in the semi-arid Puna region: The Pan de Azucar Pb-Ag-Zn mine, Argentina".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 109(2021).