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of acid mine drainage

of acid mine drainage

Acid Mine Drainage an overview ScienceDirect Topics

Acid mine drainage (AMD) Acid mine drainage (AMD) is the runoff produced when water comes in contact with exposed rocks containing sulfur-bearing minerals that react with water and air to form sulfuric acid and dissolved iron. This acidic run-off dissolves heavy metals including copper, lead, and mercury which pollute ground and surface water.

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EPA What is Acid Mine Drainage

2010-1-5  Acid Mine Drainage (AMD) is currently the main pollutant of surface water in the mid-Atlantic region. AMD iscaused when water flows over or through sulfur-bearing materials forming solutions of net acidity. AMD comesmainly from abandoned coal mines and currently active mining. AMD degrades more than 4,500 stream milesin the mid-Atlantic region with the loss of aquatic life, and restricts stream use

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Acid Mine Drainage Department of Mines, Industry

2021-7-2  Acid Mine Drainage Environmental Notes on Mining, updated September 2009 Pyrite (FeS2) is commonly associated with coal and metal ore deposits. Its oxidation occurs spontaneously in nature, causing environmental problems like Acid Mine Drainage (AMD) and mine

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Mine Drainage USGS

2021-7-4  Acid mine drainage can change the color of a stream into red or orange. Mine drainage refers to any surface water or groundwater that drains from an active or abandoned mining operation. Mine drainage can be high-quality similar to natural

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Technical Document: Acid Mine Drainage Prediction

2015-9-15  Erickson 1988, Lapakko 1993b). Commonly referred to as acid rock drainage (ARD) or acid mine drainage (AMD), acid drainage from mine waste rock, tailings, and mine structures such as pits and underground workings is primarily a function of the mineralogy of the rock material and the availability of water and oxygen.

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How does mine drainage occur? USGS

2021-7-3  How does mine drainage occur? Mine drainage is formed when pyrite (an iron sulfide) is exposed and reacts with air and water to form sulfuric acid and dissolved iron. Some or all of this iron can precipitate to form the red, orange, or yellow sediments in the

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Acid mine drainage the chemistry

2021-1-22  However, not all acid mine drainage is actually acidic. One of the reasons is because there are natural pathways through which the solution can be neutralised. For example, calcium carbonate (CaCO 3), which is found in rocks such as limestone, can neutralise the acid through the following reactions. And in fact, limestone has

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Passive Treatment of Acid-Mine Drainage

2021-6-28  Acidic mine drainage (AMD; also called “acid rock drainage” or “acid drainage”) is an environmental pol-lutant that impairs water resources in mining regions throughoutthe world. Where such treatment is required legally, treatment must be ecient and continual. Treatment methods are commonly divided into either “active,” meaning reliance on the addition of alkaline chemicals to neutralize the

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Remediation of acid mine drainage SpringerLink

2019-5-29  Acid mine drainage is the result of the exposure of sulfide minerals to oxygen, water and microorganisms. Despite being a natural process, mining activities accelerate its generation causing severe environmental impacts, particularly on soil, water

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EPA What is Acid Mine Drainage

2010-1-5  Acid Mine Drainage (AMD) is currently the main pollutant of surface water in the mid-Atlantic region. AMD is caused when water flows over or through sulfur-bearing materials forming solutions of net acidity. AMD comes mainly from abandoned coal mines and currently active mining. AMD degrades more than 4,500 stream miles

get price

Acid Mine Drainage Department of Mines, Industry

2021-7-2  Acid Mine Drainage Environmental Notes on Mining, updated September 2009 Pyrite (FeS2) is commonly associated with coal and metal ore deposits. Its oxidation occurs spontaneously in nature, causing environmental problems like Acid Mine Drainage (AMD) and mine

get price

Treatment of Acid Mine Drainage

2015-5-7  Acid mine drainage is a natural consequence of mining activity where the excavation of mineral deposits (metal bearing or coal), below the natural groundwater level, exposes sulphur containing compounds to oxygen and water. Since the introduction of steam

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ACID MINE DRAINAGE (AMD) MANAGEMENT

2019-7-19  Acid mine drainage (AMD), also is a natural occurrence resulting from the exposure of sulfur and iron bearing materials to erosion and weather. Percola-tion of water through these materials results in a discharge with low pH and high metals concentration. Although AMD is naturally occurring, mining ac-

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Technical Document: Acid Mine Drainage Prediction

2015-9-15  Acid Mine Drainage Prediction compares acid rock drainage factors of waste rock piles and tailings impoundments. In examining this table, it is important to note that diffusion of oxygen into water is slow and, therefore, oxidation of iron sulfide is inhibited until the water level drops, which can occur periodically or seasonally in some cases.

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3.1 An introduction to acid mine drainage

2015-3-30  An introduction to acid mine drainage . Iron pyrite, FeS2, also known as 'fool's gold', is the most important source of nearly all water pollution originating from mines and their residue deposits. When pyrite is exposed to air and water, it oxidises to form sulphuric acid and iron oxides and hydroxides ('yellow boy'), which causes the pH of th

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Acid mine drainage the chemistry

2021-1-22  dissociated sulphuric acid. You can see from equation (1) that in order for these reactions to happen, the pyrite must be exposed to both air and Mining is one of South Africa’s most important industries, but it comes with a cost. Rebecca Garland explains about acid mine drainage. Acid mine drainage the chemistry

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Passive Treatment of Acid-Mine Drainage

2021-6-28  Acid Mine Drainage Acid drainage occurs when minerals containing reduced forms of sulfur (S) oxidize via exposure to oxygen and water during earth disturbances (Figure 1). In coal-mining areas, the most common of these minerals is iron pyrite (FeS 2). Using FeS 2 as an example, AMD for mation can be represented as follows: FeS 2 (s) + 3.5 O 2

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Acid Mine Drainage: devastating to aquatic life toxic to

2007-7-30  acid mine drainage still affects wildlife a long way down stream because of these indirect effects. In addition to killing bottom dwelling organisms, this smothering ochre or orange precipitate reduces the amount of gravel for fish to lay their eggs on, and hence affecting fish breeding. (Pentreath,

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The Geochemistry of Acid Mine Drainage NASA/ADS

Mine wastes are the largest volume of materials handled in the world (ICOLD, 1996). The generation of acidic drainage and the release of water containing high concentrations of dissolved metals from these wastes is an environmental problem of international scale. Acidic drainage is caused by the oxidation of sulfide minerals exposed to atmospheric oxygen. Although acid drainage is commonly

get price

Acid Mine Drainage Department of Mines, Industry

2021-7-2  Acid Mine Drainage Environmental Notes on Mining, updated September 2009 Pyrite (FeS2) is commonly associated with coal and metal ore deposits. Its oxidation occurs spontaneously in nature, causing environmental problems like Acid Mine Drainage (AMD) and mine

get price

An Explanation of Acid Mine Drainage Treehugger

2019-11-13  In a nutshell, acid mine drainage is a form of water pollution that happens when rain, runoff, or streams come in contact with rock that is rich in sulfur. As a result, the water becomes very

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Acid Mine Drainage: Sources, Impacts and Prevention

2017-2-27  Acid mine drainage (AMD) is acidic water having pH of less than 5, and also containing iron, sulfate and other metals which are formed under natural conditions when hardrock mines containing pyrite are exposed to the atmosphere or oxidizing environments. In other words, AMD can also be stated as outflow of the acidic water from mining sites.

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Treatment of Acid Mine Drainage

2015-5-7  Acid mine drainage is a natural consequence of mining activity where the excavation of mineral deposits (metal bearing or coal), below the natural groundwater level, exposes sulphur containing compounds to oxygen and water. Since the introduction of steam

get price

ACID MINE DRAINAGE (AMD) MANAGEMENT

2019-7-19  Acid mine drainage (AMD), also is a natural occurrence resulting from the exposure of sulfur and iron bearing materials to erosion and weather. Percola-tion of water through these materials results in a discharge with low pH and high metals concentration. Although AMD is naturally occurring, mining ac-

get price

Passive Treatment of Acid-Mine Drainage

2021-6-28  Acid Mine Drainage Acid drainage occurs when minerals containing reduced forms of sulfur (S) oxidize via exposure to oxygen and water during earth disturbances (Figure 1). In coal-mining areas, the most common of these minerals is iron pyrite (FeS 2). Using FeS 2 as an example, AMD for mation can be represented as follows: FeS 2 (s) + 3.5 O 2

get price

Acid Mine Drainage: devastating to aquatic life toxic to

2007-7-30  acid mine drainage still affects wildlife a long way down stream because of these indirect effects. In addition to killing bottom dwelling organisms, this smothering ochre or orange precipitate reduces the amount of gravel for fish to lay their eggs on, and hence affecting fish breeding. (Pentreath,

get price

The Geochemistry of Acid Mine Drainage NASA/ADS

Mine wastes are the largest volume of materials handled in the world (ICOLD, 1996). The generation of acidic drainage and the release of water containing high concentrations of dissolved metals from these wastes is an environmental problem of international scale. Acidic drainage is caused by the oxidation of sulfide minerals exposed to atmospheric oxygen. Although acid drainage is commonly

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Neutralization of Acid Mine Drainage JSTOR

VoL 41, No. 10 ACID MINE DRAINAGE 1703 40 percent of the total amount of acid, drained yearly from mines to streams in the United States (2). Purpose of Study This study was designed to investi gate the possibilities of manipulating or recycling sludge generated in the neutralization of acid mine drainage to achieve some efficiencies or chemi

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SSR125 Acid mine drainage in Australia: Its extent

2021-7-2  About the report The oxidation of sulphidic mine wastes and the consequent release of acid mine drainage and acid rock drainage, is one of the main strategic environmental issues facing the mining industry. The production of broken waste rock and tailings by mining operations can expose large amounts of pyrite and other sulphides to the effects of water and oxygen.

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