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.
Map showing the distribution of anomalous concentrations of copper, lead, zinc, tin, and tungsten in stream sediment and heavy-mineral concentrate in the Iditarod quadrangle, Alaska
Map showing the distribution of anomalous concentrations of copper, lead, zinc, tin, and tungsten in stream sediment and heavy-mineral concentrate in the Iditarod quadrangle, Alaska
Submissions are anonymous, and your feedback will be used to help improve the USGS.gov site. Feedback can also be provided by visiting answers.usgs.gov.