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Stack #4556794

QuestionAnswer
what is strip mining trip mining – removes surface to reach shallow, horizontal deposits • Impacts: • Large areas disturbed • Erosion • Acid mine drainage – exposed rock reacts with air, water to form acid Strip Mining
Open Pit Mining deep pits are created to extract resources at and below the surface • Impacts: • Huge areas disturbed • Pit fills with acid drainage to become an acid lake Open Pit Mining
open pit mining pt 2 The Berkeley Pit – old open pit copper mine in Butte, Montana • 1,780 ft (540 m) deep mine • 900 ft (274 m) deep acid lake • pH ranges from 2.5 to 4.5 (acidity of soda, stomach acid) • High % of heavy metals and sulfuric acid
Underground mining • Max depth = 2.5 miles (4 km) deep • Impacts • Most dangerous to miners • Less environmental damage • Centralia, PA mine fire • Fire meant to clear trash dump spread to coal mine below town • Fires, carbon monoxide gas, sinkholes, and zones of lo
Mountaintop Removal is concentrated in upper levels of mountains • Impacts: • Large area disturbed • Landscape heavily changed • Valleys filled with rubble • Water pollution • Increased disease and mortality for human communities
Tailings are wastes soil, rock, water, chemicals – generated by mining activity • Tailings are stored in tailing dams • Earthen walls contain tailings in pond/lake • Concentrate toxic chemicals • Dam may leak or fail
Brumadinho Dam Disaster 2019 • 270 fatalities • River and soil heavily polluted • Loss of fishing • Loss of drinking water • Loss of irrigation for crops
What is needed to repair this damage? for dam disaster Removal of toxic mud  Milltown Dam -> Milltown State Park is example  Expensive  People left with polluted soil and water while work is ongoing
Created by: susanjpope
 

 



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