An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
The Colorado Abandoned Mine Lands (AML) program has inventoried more than 2,800 hard rock abandoned mines with over 10,000 hazardous openings on public lands administered by the BLM.