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The Chairperson welcomed those present to the start of the public hearings on acid mine drainage (AMD). This was not a new phenomenon but had been accentuated by the heavy summer rainfall in Gauteng. The Committee had engaged on the matter. A report had been completed and would be discussed. Members would meet with the mine owners the following ...
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If the mine stopped operating and dewatering stopped there was a risk of acid mine drainage affecting the nearby town of Nigel the defunct Gold Reef Mine in southern Johannesburg which is now a tourist attraction and the hydrogeologically-linked Central basin where post-mining groundwater levels were already rising because there were no active ...
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The government did the right thing by releasing a report on acid mine drainage (AMD) last week that referred to the water pollution problem in the mine voids of the Witwatersrand as a "crisis".
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Potential impacts arising from ASGM and large-scale mining activities on riverine ecosystems is depicted in a model (Figure 1) that guided the study [18]. The model has been developed based on the knowledge that land clearing, pitting and tailings disposal for mining often lead to erosion and in some cases acid mine drainage (AMD).
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Acid mine drainage (AMD) is a world wide problem that occur whenever sulfidic material is present in ... reported the occurrence of acid mine drainage in uranium mining site [1,2,3]. Two of the most famous ... The values arising from the acid-base account are referred to as maximum potential acidity (MPA) and acid neutralizing capacity (ANC ...
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to metal mining activities is acid mine drainage (AMD), which is produced by oxidation of pyrite and other metallic sulphides [34-36]. The genesis of the acid drainage and the main physical, chemical and biological factors which are involved in this process were widely studied by many investigators [37, 38].
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Acid mine drainage describes a natural process produced when the mining activities expose sulfur-bearing minerals (mostly iron sulfides) to atmospheric oxygen, moisture, and acidophilic iron-oxidizing bacteria, resulting in sulfuric acid, dissolved iron, and precipitation of ferric hydroxide.
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Acid mine drainage (AMD) water arising from coal, gold, uranium and platinum mines is a major threat to the environment. If treated correctly, this water can be transformed into potable water, while allowing the possibility of concentrating and recovering high value minerals which are ordinarily dissolved in the water stream.
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However, the legacy of coal and gold mining has left in its wake serious environmental problems. The major problem is acid mine drainage. Acid mine drainage (AMD) is formed from the hydro-geochemical weathering of sulphide-bearing rocks (pyrite, arsenopyrite and marcasite) in contact with water and oxygen [23, 27].
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Acid mine drainage (AMD) is a well-known environmental problem arising from both working and abandoned mines. This process happens when minerals, especially sulphide minerals, are exposed to the...
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similar problems were experienced in the gold mining industry as a result of exposure to silica-bearing dust, particularly in the early years of mining.2but perhaps the most severe and insidious adverse legacy of the mining industry is acid mine drainage (amd), especially that arising from coal and gold mining.3this problem has resulted in a .
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Abstract Long-term gold mining within the Witwatersrand Basin Goldfields has led to the creation of over 200 tailings storage facilities (TSFs) releasing acid mine drainage. Plumes of contaminated shallow groundwater occur downslope of these TSFs. One such area lies adjacent to the Vaal River east of the town of Orkney.
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The problem of sulphide oxidation and the associated acid mine drainage (AMD) or acid rock drainage (ARD) has been a major focus of research over the last 50 years [1]. The term AMD is commonly used (than ARD) because the process occurs mainly at mining sites.
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Mining activities have considerably increased due to notable population growth and worldwide demand for mineral resources. ... mine waste-related environmental degradation is associated with the leaching of contaminants from overburden dumps and acid mine drainage. ... as well as new opportunities and investments arising from it. Telephone ...
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The copper, gold, silver, and zinc mine on private land in the Rogue River - Siskiyou National Forest, in operation from 1904 to 1930, eventually held more than two miles of shafts and tunnels. Acid mine drainage has been coming from the mine since its closure, and entering nearby Joe Creek, a tributary of the Applegate River.
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method, but as mining operations became deeper, unoxidized ore containing pyrite (FeS 2) was encoun-tered, which interfered with the extraction. At about this time, the MacArthur-Forrest process ...
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The study involved two approaches: (i) conducting leaching experiments on oxidised and unoxidised tailings using artificial rainwater and dilute sulphuric acid and correlating the composition of crusts to these leachates and (ii) modelling the dissolution of the crusts in order to gain insight into their mineralogy and their potential impact on ...
Get price4. Naiker K, Cukrowska E, McCarthy TS. Acid mine drainage arising from gold mining activity in Johannesburg, South Africa, and environs. Environ Pollut. 2003;122:29-40. [ Links] 5. Winde FLA. Uranium pollution of South African streams - An overview of the situation in gold mining areas of the Witwatersrand. GeoJournal. 2004;61:131-149. [ Links] 6.
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The impact process2 and arises primarily when the mineral pyrite (fools gold or iron disulphide) comes of acid mine drainage in into contact with oxygenated water. The pyrite undergoes oxidation in a two-stage process, the South Africa.
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In South Africa, mine tailings and bottom ash, also colloquially referred to "ash dumps", exist in enormous quantities. Moreover, some of these waste products are presently an environmental menace responsible for discharge of acid mine drainage found in different geographical locations.
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Acid mine water, now so prevalent in Gauteng, has until recently generally been regarded as the industrialists' and mine owners' problem. However, the stage has now been reached in Gauteng's Central, Western and Eastern Basins, in which much property with foundations reaching below ground level, is threatened. Acid Mine Drainage ("AMD"), which is contaminated water . Continued
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Tailings deposited as large piles can cause a variety of environmental problems: Slumps, landslides. Tailing piles can be unstable, and experience landslides. In 1966, in Aberfan, Wales, a hill of ...
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Acid mine drainage (AMD) has received considerable coverage in the media of late and the number of short courses and workshops devoted to the topic has mushroomed. The current interest was prompted mainly by concern arising from the decanting of contaminated water from the old gold mines in the Krugersdorp area into the Cradle of Humankind.
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20 July 2010: The Department of Water Affairs outlined the national situation on acid mine drainage to the Portfolio Committee on Watern and Environmental Affairs.The department called AMD "the biggest environmental challenge ever", saying it was largely associated with gold and coal mining, with derelict mines decanting AMD and becoming the state's responsibility.
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Acid mine drainage is the flow, or seepage, of polluted water from old mining areas. Depending on the area, the water may contain toxic heavy metals and radioactive particles. These are dangerous for people's health, as well as plants and animals. Toxic water flowing out of an old mine shaft on the West Rand (January 2010)
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Gold has been mined from auriferous layers along the Witwatersrand Basin since its discovery in 1886 (Durand, 2012). Acid mine drainage is produced from the biological and chemical reactions when pyrite is exposed to oxygen and water and may be intensified by extensive fragmentation of rocks dur-ing excavation and milling of rocks.
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c Zijin Mining Group Company Limited, Shanghang 364200, Fujian, China *Corresponding author. E-mail: ah8225@163 Abstract Two-stage acid mine drainage (AMD) neutralization residue yield is 2.57 t/t acid equivalent using limestone and lime, 15.74% less than the 3.05 t/t acid equivalent yield from single-stage lime neutralization residue. XRD ...
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With gold mining continuing in the Central basin, acid mine drainage will remain a continued source of pollution to the watercourses in this area. The Klip River In-stream Water Quality guidelines were found to be of significant value in describing the general water quality of the study area.
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Mining wastes, particularly in the form of waste rocks and tailings, can have major social and environmental impacts. There is a need for comprehensive long-term strategies for transforming the mining industry to move toward zero environmental footprint. "How can the mining industry create new economic value, minimise its social and environmental impacts and diminish liability from mining ...
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The adsorption of Cu(II), Mn(II), and U(VI) ions by mesoporous silica nanoparticles (NPs) was investigated by batch experiments to assess the potential using NPs to remediate acid mine drainage (AMD) contaminated water. Adsorption reactions were found to be rapid, attaining equilibrium within 5 min for Cu and less than a minute for Mn and U. Calculated adsorption rates based on the pseudo ...
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HARMONY GOLD MINING COMPANY LTD APPELLANT and REGIONAL DIRECTOR: FREE STATE DEPARTMENT OF WATER AFFAIRS FIRST RESPONDENT ... The uncontrolled release of untreated acid mine drainage into ... sustainable management of water arising from the mining activities in the KOSH area'. The directive concludes by informing the mining companies that
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Acid mine drainage arising from gold mining activity in Johannesburg. South African Journal of Environmental Pollution 122: 29-40. CAS Article Google Scholar Öncel, I., Y. Keleş, and A. Üstün. 2000. Interactive effects of temperature and heavy metal stress on the growth and some biochemical compounds in wheat seedlings.
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Acid Mine Drainage and Other Mining-Influenced Waters (MIW) ... the California Gold Rush was the most important factor in raising US placer mining to the status of a major, world-class industry. ... first point of reference for those needing to have a general overview of the various environmental issues arising from mining and mineral ...
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The Witwatersrand region of South Africa is famous for its gold production and a major conurbation, centred on Johannesburg, has developed as a result of mining activity. A study was undertaken of surface and ground water in a drainage system in this area. Soils were also analysed from a site within the mining district.
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Acid mine drainage causes severe environmental pollution in the Rio Tinto, Spain. Some forms of mining also require the draining of underground water reservoirs called aquifers, which can cause serious impacts — like drying up springs, cutting off rivers and degrading local ecosystems. Soil Erosion
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Some of the trace and major elements commonly associated with gold mining include but are not limited to arsenic (As), cadmium (Cd), copper (Cu), chromium (Cr), iron (Fe), mercury (Hg), lead (Pb), manganese (Mn), nickel (Ni), uranium (U), vanadium (V) and zinc (Zn).
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of the acid mine drainage (AMD) environmental policy problem, located in the gold mining areas of greater Johannesburg, South Africa. With this article we make a theoretical contribution by pre- ... Contestation typically centers on tensions arising from conflicting framings of the problem (Dodge and Metze 2017), which contributes to the ...
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2. The National Nuclear Regulator's (NNR) "Status Report on the Actions Arising from the Study of Radiological Contamination of the Wonderfonteinspruit Catchment Area (WCA)". 29 October 2007. 1."Threats and opportunities for post-closure development. in dolomitic gold-mining areas of the West Rand and
Get priceAcid mine drainage (AMD) was first identified in 1556 by Diego Delgado, who reported on the state of mining in the Rio Tinto district and found that iron placed in a river dissolves in a few days. He discovered that both aquatic life and human beings were negatively affected by it (Liefferink 2012 ).
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Wildeman, T. R.; Schmiermund, R. "Mining-Influenced Waters: Their Chemistry and Methods of Treatment," 2004 National Meeting of the American Society of Mining and Reclamation and The 25th West Virginia Surface Mine Drainage Task Force, April 18-24, 2004. Google Scholar Download references
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