[Code of Federal Regulations] [Title 43, Volume 2] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 43CFR3141.5-1] [Page 403] TITLE 43--PUBLIC LANDS: INTERIOR CHAPTER II--BUREAU OF LAND MANAGEMENT, DEPARTMENT OF THE INTERIOR PART 3140_COMBINED HYDROCARBON LEASING--Table of Contents Subpart 3141_Competitive Leasing in Special Tar Sand Areas Sec. 3141.5-1 Economic evaluation. Prior to any lease sale, the authorized officer shall request an economic evaluation of the total hydrocarbon resource on each proposed lease tract exclusive of coal, oil shale or gilsonite.