The U.S. Geological Survey (USGS) is conducting market research to identify qualified businesses for whole-rock geochemical analysis services. This is a sources sought notice for planning purposes only, not a solicitation for proposals. Responses must be submitted electronically to tracy_huot@ios.doi.gov by July 24, 2026, at 5:00 PM Pacific Time. The applicable NAICS code is 541380 (Testing Laboratories and Services) with a $19 million size standard. No budget amount or performance location is specified in the description.