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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, at or call at +1-509-336-0562.

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

Please send samples and sample registration form to

GeoSep Services
1521 Pine Cone Road
Moscow, Idaho 83843 USA

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

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

CAUTION - 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.