Meeting and Agenda Notice: IGS Advisory Board Meeting on Friday, December 10, 2021 at 9:30 AM Pacific Time.

The Advisory Board will meet on Friday, December 10, 2021 from 9:30 AM-2:00 PM Pacific Time via Zoom. If you would like to join the meeting, please email 

Just Released: Geologic Map of the De Lamar and Swisher Mountain Quadrangles

IGS in the News: Geologists Use Low-Level Helicopter Flights to Map Mineral Deposits In Salmon Region

Learn more here and here.

Check out our new website!

After months of hard work, we are excited to launch our newly designed website. If you don't find something you're looking for please let us know at

Just Released: Lamprophyre dikes of northern Idaho and northeastern Washington

Just Released: 2020 Idaho Annual Mining Review

Just Released: Technical Report 20-03, 20-04

Technical Report 20-03 Geologic Map of the Northern Part of the Leadore Quadrangle, Lemhi County, Idaho


Technical Report 20-04 Geologic Map of the Butte City 7.5' Quadrangle, Butte County, Idaho


IGS Annual Report, Fiscal Year 2020

M6.5 earthquake reported northwest of Stanley, 3/31/20

See the IGS Stanley Earthquake webpage for more information. Did you feel it? If so, report it here.

Just released!

Technical Report 20-01 Geologic Map of the Bayhorse Anticline, Custer County, Idaho


Technical Report 20-02 Geologic Map of the Southern Portion of the Clayton Quadrangle, Custer County, Idaho