Environmental

In Colorado, 'acid mine drainage' from abandoned mines is a significant environmental concern because:

AA. It only affects underground water sources
BB. It creates acidic, heavy-metal-laden runoff that can contaminate streams, rivers, and drinking water sources, affecting downstream property values and water quality✓ Correct
CC. It is easily remediated by homeowners
DD. It only affects commercial mining properties

Explanation

Colorado has hundreds of abandoned mine sites, many of which generate acid mine drainage — acidic water laden with heavy metals (iron, arsenic, lead, cadmium) that flows from mine workings and tailings. This contaminates surface water and groundwater. The Animas River spill (2015) highlighted this risk. Properties near mine sites may face water quality, liability, and value concerns.

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