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.
An information handout about the role minerals play in citizen's lives. USGS Mineral Resources Program, 2009. [pdf, 1.31 MB]
Public Domain.