Here's how it works:
1. Pyrite is a common mineral found in coal seams and other rock formations.
2. Exposure to air and water: When pyrite is exposed to air and water, it undergoes oxidation.
3. Chemical reactions: This oxidation process produces sulfuric acid (H2SO4) and iron ions (Fe3+).
4. Acidic water: The sulfuric acid dissolves in water, creating acidic water with a low pH.
5. Pollution: This acidic water can leach heavy metals from the surrounding rocks and soils, contaminating water sources and harming ecosystems.
In summary: Acid mine drainage is a major environmental problem caused by the chemical weathering of sulfide minerals, particularly pyrite, when they are exposed to air and water.
