Environmental

In Montana, 'mine tailings ponds' near metal mines are a concern because they:

AProvide recreational opportunities
BContain high concentrations of processing chemicals, heavy metals, and acidic water that can leak into groundwater and surface water if the pond liner fails✓ Correct
CAre required to be converted to wetlands after mining ends
DAre subject to no environmental regulation until mining ceases

Explanation

Mine tailings ponds in Montana contain chemical byproducts of ore processing (cyanide, acid, heavy metals). Liner failures or spills can cause catastrophic contamination of surrounding water resources, as has occurred at several Montana mining sites.

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