The identified helium resources of the United States are estimated at 468 Bcf 3. This includes both demonstrated (measured and indicated) and inferred helium contained in proved, probable, and possible natural gas resources4. It also includes helium previously separated from natural gases and stored at the Cliffside Gasfield in Potter County, Texas. Helium contained in other occurrences of natural gas in the United States is estimated at 53 Bcf; this includes helium in nonconventional gas reserves and low helium content natural gas. The undiscovered helium resources in the United States are estimated at a most likely value of 110 Bcf. This results in a total helium resource base of 631 Bcf.