(a) An amendment, assignment, sublease, or leasehold mortgage of a WSR lease will be effective when approved, even if an appeal is filed under part 2 of this chapter, except:

(1) If the amendment or sublease was deemed approved under §162.572(b) or §162.580(b), the amendment or sublease becomes effective 45 days from the date the parties mailed or delivered the document to us for our review or, if we sent a letter informing the parties that we need additional time to approve or disapprove the lease, the amendment or sublease becomes effective 45 days from the date of the letter informing the parties that we need additional time to approve or disapprove the lease; and

(2) An assignment that does not require our approval under §162.574(b) or a sublease that does not require our approval under §162.578(b) becomes effective on the effective date specified in the assignment or sublease. If the assignment or sublease does not specify the effective date, it becomes effective upon execution by the parties.

(b) We will provide copies of approved documents to the party requesting approval, to the tribe for tribal land, and upon request, to other parties to the lease document.