[Code of Federal Regulations] [Title 43, Volume 2] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 43CFR3140.3-1] [Page 410] TITLE 43--PUBLIC LANDS: INTERIOR CHAPTER II--BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR PART 3140_LEASING IN SPECIAL TAR SAND AREAS--Table of Contents Subpart 3140_Conversion of Existing Oil and Gas Leases and Valid Claims Based on Mineral Locations Sec. 3140.3-1 Conversion applications. A plan of operations to convert an existing oil and gas lease or valid claim based on a mineral location to a combined hydrocarbon lease shall be filed on or before November 15, 1983, or prior to the expiration of the oil and gas lease, whichever is earlier, except as provided in Sec. 3140.1-2 of this title.