Mining water drainage

By | 05.09.2018
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Underground Mining Drainage. State of the Art Journal of Mine Water and on the Mine Water and the Environment as sources of the best available information. Mining of minerals involves excavation below the earth surface. The deep seated mineral that lies below the water table requires pumping activity for carrying out. Because coal-mine drainage can contain toxic concentrations of acidity, metals, and sediment, many of the mining impacted streams contain "no fish". Consequently, Pennsylvania loses approximately $67 million annually that could be generated if sport fishing were restored in the affected streams.
Acid mine drainage is one of mining's most serious threats to water. A mine draining acid can devastate rivers, streams, and aquatic life for hundreds, and under the "right" conditions, thousands of years. How is water managed and treated in mining? Capturing drainage water from precipitation at the mine site through the use of liners and pipes and directing the. Underground Mining Drainage. State of the Art Journal of Mine Water and on the Mine Water and the Environment as sources of the best available information. Mining of minerals involves excavation below the earth surface. The deep seated mineral that lies below the water table requires pumping activity for carrying out. Because coal-mine drainage can contain toxic concentrations of acidity, metals, and sediment, many of the mining impacted streams contain "no fish". Consequently, Pennsylvania loses approximately $67 million annually that could be generated if sport fishing were restored in the affected streams.

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Water Quality in Mining – MiningFacts.org

Because coal-mine drainage can contain toxic concentrations of acidity, metals, and sediment, many of the mining impacted streams contain "no fish". Consequently, Pennsylvania loses approximately $67 million annually that could be generated if sport fishing were restored in the affected streams. The use of water in mining has the potential to affect the quality of surrounding What are the water quality concerns at mines? Mine drainage water.

Because coal-mine drainage can contain toxic concentrations of acidity, metals, and sediment, many of the mining impacted streams contain "no fish". Consequently, Pennsylvania loses approximately $67 million annually that could be generated if sport fishing were restored in the affected streams. Underground Mining Drainage. State of the Art Journal of Mine Water and on the Mine Water and the Environment as sources of the best available information. What is Acid Mine Drainage Sources of Non-point Source Pollution 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.


Acid Mine Drainage


Acid drainage polluted stream merges with unpolluted stream downstream from California's Jamestown mine.

Acid mine drainage is one of mining's most serious threats to water. A mine draining acid can devastate rivers, streams, and aquatic life for hundreds, and under the "right" conditions, thousands of years.

How does it form?

At metal mines, the target ore (like gold, silver, copper, etc) is often rich in sulfide minerals.

When the mining process exposes the sulfides to water and air, together they react to form sulfuric acid.

This acid can dissolve other harmful metals and metalloids (like arsenic) from the surrounding rock.

Acid mine drainage can be released anywhere on the mine where sulfides are exposed to air and water -- including waste rock piles, tailings, open pits, underground tunnels, and leach pads.

Acid drainage is often marked by “yellow boy,” an orange-yellow substance (visible in the photo on this page) that occurs when the pH of acidic mine-influenced water raises above pH 3 (approaching more neutral conditions), so that the previously dissolved iron precipitates out.

Harm to fish & other aquatic life

Acid mine drainage can have severe impacts on fish, animals and plants. Many impacted streams have a pH of 4 or lower -- similar to battery acid.

For example, acid and metals runoff from the Zortman Landusky mine in Montana has harmed biological life in a dozen streams in the Little Rocky Mountains.

Perpetual pollution

Acid mine drainage is especially harmful because it can occur indefinitely -- long after mining has ended. A literature review on acid mine drainage concluded that “no hard rock surface mines exist today that can demonstrate that acid mine drainage can be stopped once it occurs on a large scale.”

Many hardrock mines across the western United States may require water treatment for hundreds to thousands of years, or “in perpetuity” as a result of acid mine drainage or metals leaching.

Earthworks released Polluting the Future in 2013, which highlights, for the first time, the staggering amount of our nation’s water supplies that are perpetually polluted by mining. It documents over 40 hardrock mines that will generate an estimated 17-27 billion gallons of polluted water every year, in perpetuity, and require costly water treatment.  

Water treatment can be a significant economic burden to the public if a company files for bankruptcy or refuses to cover water treatment costs.

For example, acid runoff from the Summitville Mine in Colorado killed all biological life in a 17-mile stretch of the Alamosa River. The site was designated a federal Superfund site, and the EPA has spent over $210 million on clean-up.


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Tagged with: water pollution, perpetual pollution, acid mine drainage, acid drainage

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