30 CFR 1212.50 : Mineral Resources (§ 1.1 To Parts 1291-1299) — (§ 700.1 To Parts 1291-1299) — Office Of Natural Resources Revenue, Department Of The Interior (Part 1200 To Parts 1291-1299) — Natural Resources Revenue (Part 1200 To § 1243.202) — Records And Files Maintenance (Subpart A To Subpart I) — Oil, Gas, And Ocs Sulphur - General (§ 1212.50 To § 1212.52) — Required recordkeeping and reports.

All records pertaining to offshore and onshore Federal and Indian oil and gas leases shall be maintained by a lessee, operator, revenue payor, or other person for 6 years after the records are generated unless the recordholder is notified, in writing, that records must be maintained for a longer period. When an audit or investigation is underway, records shall be maintained until the recordholder is released by written notice of the obligation to maintain records.