One person was killed and 12 people remain trapped inside a Colorado gold mine after the elevator shaft malfunctioned, causing “a severe danger” during a tour Thursday, sheriff officials said.

Antioch's Black Diamond Mines Regional Preserve offers visitors a unique opportunity to learn about California's rich mining history.

A former coal mine here that was closed in 1994 is still attracting visitors aspiring to see the rare sight of a shaft mouth.The ･･･ ...