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ELDORA, Colo. (AP) — Authorities in Boulder County say seepage from an old mine caused a creek to turn orange but say the minerals and metals were not toxic.

An investigation started Monday afternoon after a resident reported that a small creek that runs through Eldora had changed color.

The Boulder County Sheriff’s Office says the source of the seepage was the Swathmore Mine, where a plug had come loose.

Water intake systems for the city of Boulder and the town of Nederland were shut down while local authorities and the Environmental Protection Agency investigated what was in the water.