Exhibit 10.11 [McMoRan Letterhead] February 28, 1997 Mr. Robert M. Wohleber Freeport-McMoRan Resource Partners 1615 Poydras Street New Orleans, LA 70112 re: OCS Lease Sale No. 166 Dear Mr. Wohleber: This will confirm our telephone conversation whereby we discussed the participation of Freeport-McMoRan Resource Partners ("FMRP") in the several bids that McMoRan Oil & Gas Co. ("MOXY") proposes to submit at the captioned lease sale to be held on March 5, 1997. This letter agreement will not apply to any blocks that lie within an area of mutual interest between MOXY and CoEnergy Central Exploration, Inc. FMRP has agreed to participate in such proposed bids on the following basis: 1. Any lease acquired by such bids will be owned equally by MOXY and FMRP. 2. FMRP will bear 60% and MOXY will bear 40% of all costs involved in generating such bids and/or acquiring leases thereon. Such costs will include related general and administrative costs, geological and geophysical costs and the bonus cost and first year rental of any leases so acquired at such lease sale. 3. The expenditure anticipated to be incurred in attempting to acquire these leases is estimated to be in the range of $9,000,000.00 and such expenditure shall not exceed $10,000,000.00 without further review by FMRP. 4. The cost and ownership relating to these leases will be handled in substantially the same manner as set forth in the proposed MOXY 1997 Participating Agreement for the acquisition of leasehold interests, copy of which agreement we recently provided to Roger Baker. 5. FMRP will promptly reimburse MOXY for its 60% share of the costs and expenses described above. 6. Notwithstanding the foregoing, if MOXY acquires a lease with a third party, the rights and obligations of FMRP as to such lease will be reduced in proportion to the interest acquired by such third party. If this is in accordance with your understanding, please so indicate by signing and returning to us one copy of this letter agreement. McMoRan Oil & Gas Co. By: /s/ Glenn A. Kleinert __________________________ Glenn A. Kleinert Agreed to and accepted this 1st day of March 1997 Freeport-McMoRan Resource Partners By: /s/ Robert M. Wohleber By: /s/ Rene Latiolais _____________________________ __________________________ Robert M. Wohleber Rene Latiolais