As part of a way of funding public education in The University of Texas System, two million acres of land were placed in the PUF - one million of which were in west Texas and deemed too worthless to survey by the Texas & Pacific Railroad.
Initially, the only money in the PUF came from leasing grazing rights on PUF land.
However, it just so happens that a chunk of the west Texas PUF land sits on top of the Permian Basin . . . and the PUF now generates revenue from oil, gas, sulfur, and water royalties, rentals on mineral leases, and other sources.
The PUF funds are state funds. A portion of the revenue flows each year into the Annual University Fund. 2/3 of that amount goes to UT and 1/3 goes to Texas A&M.
Contrary to the idea that UT has its own money and doesn't get money from the State of Texas, all of the PUF/AUF money it receives is government money via the Texas State Constitution.
Thanks for the clarification.