43 CFR §3140.13

1. (a)The authorized officer may grant permission to holders of existing oil and gas leases to gather information to develop, perfect, complete or amend a plan of operations required for conversion upon the approval of the authorized officer of an exploration plan developed in accordance with 43 CFR 3592.1.
2. (b)The approval of an exploration plan in units of the National Park System requires the consent of the Regional Director of the National Park Service in accordance with § 3140.70.
3. (c)The filing of an exploration plan alone will be insufficient to meet the requirements of a complete plan of operations as set forth in § 3140.23.