Environmental assessment of the potential for arsenic leaching into groundwater from mine wastes in Baja California Sur, Mexico
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| Formato: | Artículo científico |
| Lenguaje: | en |
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Universidad Nacional Autónoma de México
1998
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| _version_ | 1876441681380769792 |
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| author | J. I. Drever |
| author_facet | J. I. Drever |
| contents | Environmental assessment of the potential for arsenic leaching into groundwater from mine wastes in Baja California Sur, Mexico J. I. Drever A. Carrillo Ciencias de la Tierra arsenolite Arsenic contamination Baja California mining Arsenolite (As2O3) was historically produced as a byproduct of gold and silverextraction in southernmost Baja California Peninsula. There are in the San Antonio-El Triunfo area more than 800,000 tonnes of mine waste material with an averagecontent of 4% arsenic oxide. The chemical reaction to produce arsenic trioxide(arsenolite) was the oxidation of arsenopyrite (AsFeS) with gold (ore) to produceiron oxides (Fe2O3) with gold and releasing SO2 and As2O3 fumes. During theprocess the arsenic fumes sublimated onto the inner walls of old, mineral processingplants. When the chambers filled up, they were periodically emptied out on big pilesof oxidized tailings. But once the plants were abandoned, the chambers remain halffilled with approximately 600 tonnes of pure arsenolite. X-ray diffraction andscanning electron microscopy/energy dispersive X-ray spectrometry (EDS) indicatethat the trace element content in the arsenolite and its banded structure may be dueto the use of different ore for gold and silver extraction. A rough but conservativeanalysis of the potential leaching, based on results of the humidity cell test on minewaste material (arsenolite and arsenolite-bearing oxidized tailings) indicates thatfrom 0.5 to 2.0 mg/l arsenic could be released into the groundwater system of theregion. Real world data from the local aquifer show a close match with thecalculations, indicating the close relation between arsenic content in tailings andgroundwater. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837104 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.37 |
| format | Artículo científico |
| id | redalyc_56837104 |
| institution | Redalyc |
| language | en |
| publishDate | 1998 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Environmental assessment of the potential for arsenic leaching into groundwater from mine wastes in Baja California Sur, Mexico J. I. Drever Ciencias de la Tierra arsenolite Arsenic contamination Baja California mining Environmental assessment of the potential for arsenic leaching into groundwater from mine wastes in Baja California Sur, Mexico J. I. Drever A. Carrillo Ciencias de la Tierra arsenolite Arsenic contamination Baja California mining Arsenolite (As2O3) was historically produced as a byproduct of gold and silverextraction in southernmost Baja California Peninsula. There are in the San Antonio-El Triunfo area more than 800,000 tonnes of mine waste material with an averagecontent of 4% arsenic oxide. The chemical reaction to produce arsenic trioxide(arsenolite) was the oxidation of arsenopyrite (AsFeS) with gold (ore) to produceiron oxides (Fe2O3) with gold and releasing SO2 and As2O3 fumes. During theprocess the arsenic fumes sublimated onto the inner walls of old, mineral processingplants. When the chambers filled up, they were periodically emptied out on big pilesof oxidized tailings. But once the plants were abandoned, the chambers remain halffilled with approximately 600 tonnes of pure arsenolite. X-ray diffraction andscanning electron microscopy/energy dispersive X-ray spectrometry (EDS) indicatethat the trace element content in the arsenolite and its banded structure may be dueto the use of different ore for gold and silver extraction. A rough but conservativeanalysis of the potential leaching, based on results of the humidity cell test on minewaste material (arsenolite and arsenolite-bearing oxidized tailings) indicates thatfrom 0.5 to 2.0 mg/l arsenic could be released into the groundwater system of theregion. Real world data from the local aquifer show a close match with thecalculations, indicating the close relation between arsenic content in tailings andgroundwater. 1998 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56837104 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.37 |
| title | Environmental assessment of the potential for arsenic leaching into groundwater from mine wastes in Baja California Sur, Mexico |
| topic | Ciencias de la Tierra arsenolite Arsenic contamination Baja California mining |
| url | https://www.redalyc.org/articulo.oa?id=56837104 |