Environmental
South Dakota's Gold Rush history in the Black Hills left behind numerous mine tailings. These tailings can contain:
AOnly clay and sand
BHeavy metals such as arsenic, lead, and cyanide from ore processing✓ Correct
CBeneficial soil nutrients for farming
DNatural gas that can be captured for energy
Explanation
Historic mine tailings in the Black Hills may contain elevated levels of heavy metals (arsenic, lead, mercury) and chemical residues (cyanide) from gold ore processing, posing long-term environmental hazards.
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