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Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran

Department of Earth Sciences, Shiraz University, Shiraz 7146713565, Iran
Department of Geology, Earth Sciences Faculty, Shahid Chamran University, Ahvaz 6135743136, Iran
College of Science, Technology and Engineering, Centre for Environmental and Sustainability Science, James Cook University, PO Box 6811, Cairns, Queensland 4870, Australia
Department of Geology, Faculty of Sciences, Brandon University, Brandon, MB R7A 6A9, Canada
Author to whom correspondence should be addressed.
Academic Editor: Maria Economou-Eliopoulos
Minerals 2016, 6(1), 11;
Received: 10 November 2015 / Accepted: 28 January 2016 / Published: 6 February 2016
(This article belongs to the Special Issue Mineral Deposit Genesis and Exploration)
A new heterotrophic strain, named Providencia sp. JAT-1, was isolated and used in bioleaching of low-grade complex copper ore. The strain uses sodium citrate as a carbon source and urea as a nitrogen source to produce ammonia. The optimal growth condition of the strain is 30 C, initial pH 8, sodium citrate 10 g/L and urea 20 g/L, under which the cell density and ammonia concentration in the medium reached a maximum of 4.83 × 108 cells/mL and 14 g/L, respectively. Ammonia produced by the strain is used as the main lixiviant in bioleaching. Bioleaching results revealed that higher strain growth led to a higher copper recovery, while higher pulp density will cause a greater inhibitory effect on strain growth and ammonia production. The copper extraction reached the highest value of 54.5% at the pulp density of 1%. Malachite, chrysocolla and chalcocite are easy to leach out in this bioleaching system while chalcopyrite is difficult. Results of comparative leaching experiments show that bioleaching using JAT-1 is superior to ammonia leaching at the same condition. The metabolites produced by the strain other than ammonia are also involved in bioleaching. View Full-Text
Keywords: karst bauxite; stable isotope; Dopolan; Zagros; Iran karst bauxite; stable isotope; Dopolan; Zagros; Iran
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Ellahi, S.S.; Taghipour, B.; Zarasvandi, A.; Bird, M.I.; Somarin, A.K. Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran. Minerals 2016, 6, 11.

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