Is acid mine drainage a problem in Pennsylvania?
Acid mine drainage is a serious problem that effects thousands of streams in PA alone. The cause of acid mine drainage is from a natural process when rocks that were once underground become exposed to air and water.
Where is acid mine drainage located?
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.
What acid is most commonly found in mine drainage?
sulfuric acid
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 bottom of streams containing mine drainage.
Is acid mine drainage regulated in the US?
Acid mine drainage is water containing sulfur-bearing minerals produced from mining activities. As such, the drainage is regulated by the federal government through mine site cleanup projects.
What mines in Pa contribute to acid mine drainage?
Acid mine drainage from abandoned coal mines has contaminated more than 3,000 miles of streams in Pennsylvania and it is the most extensive water-pollution problem affecting watersheds in Pennsylvania (Pennsylvania USGS website).
What is Sulphuric acid used for in mining?
In metal mining, sulfuric acid is used to leach copper oxide minerals. In one process, a solution of sulfuric acid laden with copper sulfate is stripped of copper via a solvent extraction and electro winning with the used sulfuric acid recycled back into the process.
What mining companies can solve the problem of acid mine drainage?
The most prevalent method for treating AMD contamination is the addition of alkaline reagents such as lime, limestone, sodium carbonate or sodium hydroxide. This treatment aims at neutralizing acidic water and the precipitation of heavy metals.
What is the main reason for acid mine drainage?
The highly acidic water, commonly known as acid mine drainage, is produced by the exposure of sulfide minerals (most commonly pyrite) to air and water, resulting in the oxidation of sulfur and the production of acidity and elevated concentrations of iron, sulfate, and other metals [1].
Why is mine water blue?
Likely Cause is Chloride Buildup “When you wash sand and gravel,” he said, “you often get very blue water. Most times it is high in chlorides. Over time, the chloride concentration builds up and causes water to change color. “Once a mine’s ponds get super saturated, they are no use to miners.
What is acid mine drainage caused by?
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.
What is acid mine drainage AMD?
What is Acid Mine Drainage AMD – Wikipedia Definition. Acid mine drainage (AMD), or acid rock drainage (ARD), refers to the outflow of acidic water from (usually abandoned) metal mines or coal mines.
What is acid drainage?
Definition of Acid drainage. Acid drainage means water with a pH of less than 6.0 and in which total acidity exceeds total alkalinity, discharged from an active, inactive, or abandoned surface coal mining and reclamation operation or from an area affected by surface coal mining and reclamation operations. Sample 1. Sample 2.