Water Pollution
Abandoned mines can produce highly acidic water rich in metals, which can cause dangerously low pH levels in surrounding water.

Highly acidic water rich in metals, or AMD, is a serious problem at many abandoned mines. Abandoned mines can produce AMD for more than 100 years and, consequently, pose significant risks to surface water and ground water. AMD can lower the pH of surrounding surface water, making it corrosive and unable to support many forms of aquatic life and vegetation. Humans may also be affected by consuming water and fish tissue with a metal content.