43 CFR § 3511.15 How long will my lease be in effect

Commodity	Initial Term	Period of Renewal or Readjustment
(a) Phosphate	Indeterminate	Subject to readjustment at the end of each 20 year period.
(b) Sodium	20 years	Can be renewed for 10 years at the end of the initial term and for following 10 year periods.
(c) Potassium	Indeterminate	Subject to readjustment at the end of each 20 year period.
(d) Sulphur	20 years	Can be renewed for 10 years at the end of the initial term and for following 10 year periods.
(e) Gilsonite	20 years and for as long thereafter as gilsonite is produced in paying quantities	Subject to readjustment at the end of each 20 year period.
(f) Hardrock Minerals	not to exceed 20 years	Can be renewed for 10 years at the end of the initial term and for following 10 year periods.
(g) Asphalt	20 years	Can be renewed for 10 years at the end of the initial term and for following 10 year periods.

Title 43