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February 1, 2018
DENVER — Crumbling mine tunnels awash with polluted waters perforate the Colorado mountains, and scientists may one day send robots creeping through the pitch-black passages to study the mysterious currents that sometimes burst to the surface with devastating effects.
One such disaster happened at the inactive Gold King Mine in southwestern Colorado in 2015, when the Environmental Protection Agency accidentally triggered the release of 3 million gallons of mustard-colored water laden with arsenic, lead and other contaminants. The spill tainted rivers in three states.
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