Code of Federal Regulations Title 43. Public Lands:  Interior § 43.3514.25 When does my lease expire?

(a) Sodium, sulphur, asphalt, and hardrock mineral leases expire at the end of the lease term. If you file a timely application for lease renewal under § 3511.27 of this part, your lease expires on the expiration date or the date BLM rejected your application, whichever is later.

(b) Potassium, phosphate and gilsonite leases continue for so long as you comply with the lease terms and conditions which are subject to periodic readjustment.

(c) For more information, see § 3511.15 of this part.