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Showing 1 to 18 of 18 for “"Mine wastes"”.
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Geochemical Reactions in Unsaturated Mine Wastes
… huge amounts of waste that can lead to acid mine drainage (AMD). Most of these mine wastes occur as large piles that are open to the atmosphere so that air and water vapor can circulate through them. This study addresses the reactions and transformations of the minerals that occur in humid …
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Phosphate stabilisation of partly oxidised, polyminerallic mine wastes
The oxidation of sulphides present in mine waste may produce acidity and release dissolved metals and sulphate into local surface and ground waters. This process is known as acid mine drainage and is considered the most important environmental problem currently facing the mining industry. Phosphate …
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An experimental investigation of leachate generation predictions of waste from copper sulphide ore processing
The greatest environmental liability in the mineal processing industry is the prolonged environmental degredation of groundwater and land, resulting from Acid Mine Drainage (AMD) formation from mine wastes due to oxidation of sulphide minerals. AMD enhances the mobilisation of trace and minor …
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The impact of nonpoint source pollution from mining wastes on water quality, Elko County, Nevada
A study was performed at a mine site in Elko County, Nevada to determine the effects on water quality resulting from waste rock at the site. Statistically significant (alpha less than or equal to 0.05) increases of several constituents, including sulfate (272 mg/L), calcium (46 mg/L), and magnesium …
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Electrochemical studies of pyrite and galena
… of pyrite in order to better understand how mine wastes containing pyrite generate acid water. It was found that a unique potential exists at which a fresh surface of pyrite undergoes neither oxidation nor reduction. This potential is pH dependent and is referred to as the "stable" potential. …
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Effects of heavy metals on the physical activity and survival of freshwater clams
<p>"Hard rock mining for valuable minerals can have negative impacts on the environment, both through the deposition of mine waste and through direct, physical impacts. The Bunker Hill Mine and other mines in/around Kellogg, ID produced approximately one-fifth of the nation's lead and zinc and …
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Application of mineralogy in the interpretation of laboratory scale acid rock drainage (ARD) prediction tests : a gold case study
… large tonnages of waste, with up to 99% of mined gold ore discharged as waste. The waste generated contains unoxidized sulfides that when exposed to air and water react to form acid, which results in acid rock drainage (ARD). ARD is usually associated with low pH, high sulfate content and …
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Applications of phytase-mediated phosphate biomineralizaton for the remediation of uranium mine tailings
… naturally occurring radionuclides.;Phosphate mineral phases have been researched as a method of immobilising contaminants including lead, radium, and uranium as natural analogues demonstrate that these metals can be stably incorporated into phosphate minerals over geological timescales and …
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Evaluation of potential acid mine drainage: A case study of the Albert Silver Mine, Mpumalanga Province, South Africa
Generally, mining produces mine wastes that contain sulfide minerals that have potential to produce acid mine drainage. Albert Silver Mine conducted mining of the silver-sulfide bearing ore from 1885 to 1914. However, at the time, little attention was being given to acid mine water generation. This …
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Hydrogeochemical Evaluation and Impact of Remediation Design on Arsenic Mobility at Historical Gold Mine Sites
Historical gold mine tailings at several sites in Nova Scotia, Canada are publicly accessible and may pose a threat to human and ecosystem health because of high arsenic (As) concentrations in the tailings (max 25 wt.%) and associated pore waters (up to 100 mg/L). Two of these sites, Montague and …
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Hydrozincite bioprecipitation: a promising tool for bioremediation of waters contaminated by harmful metals. Hydrochemical factors and morphological features of the biomineralization process
… composition of sphalerite from tailings and mine wastes. Waters from tributaries show the lowest concentrations of contaminants. The highest contents in harmful and toxic elements were observed in waters that drain flotation tailings and mine wastes. Metals concentrations change under …
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The comparative ecology of Minuartia verna (L.) Hiern and Thlaspi alpestre L. in the southern pennines, with special reference to heavy metal tolerance.
… shows a close association with metalliferous mine workings, particularly in the Pennines, where both species have become prominent components of the flora of calcareous lead mine wastes. By comparison with M. verna, T. alpestre is more restricted in its distribution and is a rarer species. The …
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Characterization of the CRM occurrences in ore deposits of Sardinia
… occurrence of economic raw materials in various mineral deposits of southern and central Sardinia, with a focus on a specific class of deposit named “skarns”. In the last decades concerns have increased about the supply for specific elements and minerals, essential to high-end industrial …
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Characterization and prediction of long-term arsenic mobility, dissolution, and kinetic behavior in arsenic contaminated floodplain deposits of Whitewood Creek and the Belle Fourche River, South Dakota
From 1877 to 1977, the Homestake Mine discharged over 100 million tons of arsenic-rich mine-wastes from Lead, South Dakota into Whitewood Creek (WWC), which joins the Belle Fourche River (BFR). Arsenopyrite and other arsenic-bearing minerals were deposited in tailings (containing between 0.12% to …
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The development of a mathematical model for the bioextraction of the critical raw material magnesium from mine waste using acidithiobacillus caldus
… a model to describe the bioleaching of magnesium mine wastes, ultimately maximising magnesium extraction while minimising reliance on synthetic acid. In the absence of experimental data on the dissolution profiles of the waste, kinetic models were developed to describe the leaching of individual …
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Quantifying texture for acid rock drainage characterisation and prediction
Minerals, metals and mining are the cornerstone of technological development and play an essential role in achieving the United Nations Sustainable Development Goals. Mining, however, is not a wastefree process, with mine wastes being a source of a host of environmental problems. One of these is …