More than 10 people were trapped and 11 others were rescued after they were caught 1,000 feet below ground at the Mollie Kathleen Gold Mine located in Teller County, Colorado, Scripps News Colorado Springs reported.
The sheriff's office reported that an equipment malfunction caused people at the mine to become trapped.
Emergency crews, including the Colorado Springs Fire Department, responded to the scene after a call was made at around 1:30 p.m. local time.
The Mollie Kathleen Gold Mine was closed in the 1960s but has since conducted tours of the mines which remained popular over the years, according to the mine's tour website.
The operators of the tour say revenue from tours goes, in part at least, to maintain safety on the property, where walking tours are offered seasonally.
Tours at the mine run from May through the second weekend in October, organizers say.
Scripps News Colorado Springs reported that it wasn't immediately clear if all or some of those trapped or rescued were there on a tour.
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