Documents disponibles écrits par cet auteur

Geochemical evaluation of heap rinsing of the Gold Acres Heap, Cortez joint venture, Nevada / R. J. Bowell in Minerals engineering, Vol. 22 N° 5 (Avril 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 477–489 Titre : Geochemical evaluation of heap rinsing of the Gold Acres Heap, Cortez joint venture, Nevada Type de document : texte imprimé Auteurs : R. J. Bowell, Auteur ; J.V. Parshley, Auteur ; G. McClelland, Auteur Année de publication : 2009 Article en page(s) : pp. 477–489 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Geochemistry  Heap  leach  Closure  Rinsing Résumé : This paper presents a summary of field and laboratory studies conducted to determine the need and extent of rinsing requirements for a spent oxide gold heap. The testwork utilized the Gold Acres Heap in Nevada. Monitoring data was reviewed to examine the geochemical processes occurring within the heap and predict the chemistry of future heap solutions for the Gold Acres Heap as well as the other heap facilities. In conjunction with this field study, column rinsing tests involving freshwater and recycled process water were conducted using representative spent oxide ore from the Gold Acres Heap in order to simulate heap conditions observed during field rinsing. A comparison between the column test results and the monitoring data collected during field scale recirculation indicates rinsing oxide ore recirculated barren solution does not decrease solute loadings. The column test indicates applying multiple freshwater rinses to the heap will only exacerbate the release of constituents by changing the pH-redox conditions of the heap. Consequently, this study indicates rinsing heap material with recirculation barren solution will produce no significant change (i.e., improvement) in the heap solution chemistry with respect to environmental release. Rinsing with freshwater will result in a higher risk for potential environmental degradation than not rinsing at all. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002872 [article] Geochemical evaluation of heap rinsing of the Gold Acres Heap, Cortez joint venture, Nevada [texte imprimé] / R. J. Bowell, Auteur ; J.V. Parshley, Auteur ; G. McClelland, Auteur . - 2009 . - pp. 477–489. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 5 (Avril 2009) . - pp. 477–489 Mots-clés : Geochemistry  Heap  leach  Closure  Rinsing Résumé : This paper presents a summary of field and laboratory studies conducted to determine the need and extent of rinsing requirements for a spent oxide gold heap. The testwork utilized the Gold Acres Heap in Nevada. Monitoring data was reviewed to examine the geochemical processes occurring within the heap and predict the chemistry of future heap solutions for the Gold Acres Heap as well as the other heap facilities. In conjunction with this field study, column rinsing tests involving freshwater and recycled process water were conducted using representative spent oxide ore from the Gold Acres Heap in order to simulate heap conditions observed during field rinsing. A comparison between the column test results and the monitoring data collected during field scale recirculation indicates rinsing oxide ore recirculated barren solution does not decrease solute loadings. The column test indicates applying multiple freshwater rinses to the heap will only exacerbate the release of constituents by changing the pH-redox conditions of the heap. Consequently, this study indicates rinsing heap material with recirculation barren solution will produce no significant change (i.e., improvement) in the heap solution chemistry with respect to environmental release. Rinsing with freshwater will result in a higher risk for potential environmental degradation than not rinsing at all. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508002872

Humidity cell tests for the prediction of acid rock drainage / D.J. Sapsford in Minerals engineering, Vol. 22 N° 1 (Janvier 2009) 

Public ISBD [article]  in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 25–36 Titre : Humidity cell tests for the prediction of acid rock drainage Type de document : texte imprimé Auteurs : D.J. Sapsford, Auteur ; R. J. Bowell, Auteur ; M. Dey, Auteur Année de publication : 2009 Article en page(s) : pp. 25–36 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Acid  rock  drainage  Sulfide  ores  Pollution  Environmental  Oxidation Index. décimale : 622 Industrie minière Résumé : This paper presents a study of various geochemical humidity-style weathering tests that were carried out on waste mine rock from Avoca, County Wicklow, Ireland. The aim of this paper is to present data that demonstrate some of the geochemical controls on weathering rates together with release rates from laboratory testwork. These data are used to determine the applicability of various interpretations of humidity cell data for prediction of acid rock drainage. Furthermore, within this context the paper offers opinion on common questions related to the use of such tests: should humidity cells be aerated? How long should the test be run for? Is pre-treatment of the samples required? Is inoculation of the samples with iron and sulfur oxidising microbes required? And should these tests really be considered to be accelerated weathering tests? DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000770 [article] Humidity cell tests for the prediction of acid rock drainage [texte imprimé] / D.J. Sapsford, Auteur ; R. J. Bowell, Auteur ; M. Dey, Auteur . - 2009 . - pp. 25–36. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 1 (Janvier 2009) . - pp. 25–36 Mots-clés : Acid  rock  drainage  Sulfide  ores  Pollution  Environmental  Oxidation Index. décimale : 622 Industrie minière Résumé : This paper presents a study of various geochemical humidity-style weathering tests that were carried out on waste mine rock from Avoca, County Wicklow, Ireland. The aim of this paper is to present data that demonstrate some of the geochemical controls on weathering rates together with release rates from laboratory testwork. These data are used to determine the applicability of various interpretations of humidity cell data for prediction of acid rock drainage. Furthermore, within this context the paper offers opinion on common questions related to the use of such tests: should humidity cells be aerated? How long should the test be run for? Is pre-treatment of the samples required? Is inoculation of the samples with iron and sulfur oxidising microbes required? And should these tests really be considered to be accelerated weathering tests? DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687508000770