At Mines, as well as the other PhD-granting Colorado institutions, the differential tuition is picked up as a scholarship for one year, after which the RA or TA is expected to become a Colorado resident for tuition purposes. This is primarily driven by the fact that the State imposes a 45/55 resident/nonresident FTE ratio on the entire institutions (undergraduate and grad), not including international students who always get the differential picked up if an RA or TA.