More than 23,000 abandoned mines dot public and private land in Colorado and at least 500 of them measurably harm water quality, according to the Colorado Division of Reclamation, Mining and Safety.

The Colorado Department of Labor and Employment ... But federal authorities have warned that active and abandoned mine sites still "pose serious risks to people untrained and unfamiliar with ...

Here are expanded descriptions for all 20 ghost towns in Colorado: ...

DENVER — A new law decades in the making could finally lead to the cleanup of some of the thousands of abandoned mines in Colorado that leak toxic metals and acid into the headwaters of the ...