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Related Concept Videos

Acid Mine Drainage01:19

Acid Mine Drainage

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Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten...
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Microbial Leaching

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Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
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Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella,...
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Precipitation and Co-precipitation01:17

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

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Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
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When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
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Watershed Planning within a Quantitative Scenario Analysis Framework
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Acid mine drainage from inactive eastern coal operations.

P M Erickson1, K J Ladwig, R L Kleinmann

  • 1U.S. Department of the Interior, Bureau of Mines, Pittsburgh Research Center, P.O. Box 18070, 15236, Pittsburgh, PA, USA.

Environmental Geochemistry and Health
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Revegetation alone often fails to stop acid mine drainage. Monitoring oxygen and gas composition in mine waste reveals oxidation zones and transport pathways, informing better acid abatement strategies.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Mine Reclamation

Background:

  • Acid mine drainage (AMD) is a persistent environmental problem from inactive mines.
  • Revegetation is a common but often ineffective AMD abatement technique.
  • Understanding pyrite oxidation and acid transport is crucial for effective reclamation.

Purpose of the Study:

  • Investigate pyrite oxidation zones and acid product migration at inactive mine sites.
  • Assess the effectiveness of current AMD abatement methods.
  • Inform the development of improved acid production mitigation technologies.

Main Methods:

  • Field studies at six inactive spoil and refuse sites.
  • Monitoring of gas composition (oxygen concentration) in unsaturated mine waste.
  • Analysis of hydrologic factors and sulfate transport in spoil.

Main Results:

  • Oxygenated zones (<1m depth) were identified in barren refuse.
  • Oxygen availability was observed throughout unsaturated coal spoil, even in revegetated areas.
  • Gas composition showed vertical, lateral, and seasonal variations.
  • Discharge monitoring alone inadequately represented acid product mass transport.

Conclusions:

  • Standard reclamation practices may be insufficient for certain mine sites.
  • Pyrite oxidation and acid transport dynamics are complex.
  • Further research is needed to develop source-based AMD mitigation technologies.