Download e-book for kindle: Mine wastes : characterization, treatment and environmental by Bernd G Lottermoser

By Bernd G Lottermoser

ISBN-10: 3540486291

ISBN-13: 9783540486299

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Additional resources for Mine wastes : characterization, treatment and environmental impacts ; with 43 tables

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Temperature of the waste. The oxidation of pyrite is exothermic and generates heat as shown by the above equations. Such elevated temperatures are also advantageous to the growth of thermophilic bacteria. These bacteria use some of the released energy for their metabolic processes. However, most of the energy is released as heat and within the physical confines of waste dumps and tailings dams, there is little dissipation of the heat due to the abundance of gangue minerals with poor heat conductivity.

1). 3 Present-Day Unregulated Mining Today, mines wastes are produced around the world in nearly all countries. In many developing countries, the exploitation of mineral resources is of considerable importance for economic growth, employment and infrastructure development. 5 · Mining and Environmental Impacts 21 Fig. 7. Abandoned tin dredge in the dry stream bed of Nettle Creek, Innot Hot Springs, Australia. The bucket dredge was used in the 20th century to extract alluvial cassiterite. During mining, the dredge caused a massive increase in suspended sediment loads and the deterioration of stream water quality.

These gangue minerals have the capacity to buffer acid; that is, the minerals will react with and consume the hydrogen ions. Acid buffering is largely caused by the weathering of silicates, carbonates and hydroxides. The buffering reactions occur under the same oxidizing conditions, which cause the weathering of sulfide minerals. However, unlike sulfide oxidation reactions, acid buffering reactions are independent of the oxygen concentration of the gas phase or water in which the weathering reactions take place.

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Mine wastes : characterization, treatment and environmental impacts ; with 43 tables by Bernd G Lottermoser

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