43 CFR §3207.10

1. (a)Leases have a primary term of 10 years.
2. (b)BLM will extend the primary term for 5 years if:
   1. (1)By the end of the 10th year of the primary term in paragraph (a), you have satisfied the requirements in § 3207.11; and
   2. (2)At the end of each year after the 10th year of the lease, you have satisfied the requirements in § 3207.12(a) or (d) for that year.
3. (c)BLM will extend the primary term for 5 additional years if:
   1. (1)You satisfied the requirements of § 3207.12(b) or (d); and
   2. (2)At the end of each year of the second 5-year extension you satisfy the requirements in § 3207.12(c) or (d) for that year.
4. (d)If you do not satisfy the annual requirements during the initial or additional extension of your primary term, your lease terminates or expires.