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Contact Us

For more information regarding our processes or to schedule analytical work, please email Dr. Paul O’Sullivan, Principal Manager, Paul email or call at +1-509-336-0562.

Additional contact:  Andrea O’Sullivan, Administrative Manager and Webmaster,  Andrea email or +1-208-669-0727.

For questions regarding open mineral separation projects, please contact Jim McMillan, Facility Manager, at Lab email.

Please send samples and sample registration form to either address (and let us know which one)

Production Facility:
GeoSep Services
509 W. Palouse River Dr. Unit #102
Moscow, Idaho 83843 USA


GeoSep Services
1521 Pine Cone Road
Moscow, Idaho 83843 USA

Please see packing guidance (what not to do) at this link.


If you observe issues with any of our web pages, please contact the webmaster: Andrea. (There were some issues in June-July 2023.)

Prior Financial Fraud Check Scam, June/July 2020: If you receive a check showing our company name after applying for a job (possibly via Facebook), it is fake (not sent by us). Do not try to deposit the check and do not text the number provided. Please let us know you received one of these checks. We encourage you to contact your local police about this scam.