Environmental

In Montana, the presence of old mining tailings (waste rock) near a residential property is a concern primarily because:

AThey improve soil fertility
BThey may contain high concentrations of heavy metals that can be toxic to residents and contaminate water✓ Correct
CThey are protected historic sites
DThey increase property value due to mineral content

Explanation

Mining tailings in Montana often contain elevated levels of arsenic, lead, cadmium, and other heavy metals that can leach into soil and groundwater, posing serious health and environmental risks to nearby residents.

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