Exhibit 10.6


                                           EXECUTION COPY


                                   FMPO GUARANTEE AGREEMENT dated as of
                              December 15, 1997 (this "Guarantee"), by FM
                              Properties Inc., a Delaware corporation
                              ("FMPO"), for the benefit of the lender
                              party to the Consolidated Credit Agreement
                              (as defined below) from time to time (the
                              "Lenders").


                         WHEREAS, Freeport-McMoRan Inc., a Delaware
               corporation ("FTX"), intends to consummate a merger, whereby
               FTX shall be merged with and into IMC Global Inc., a
               Delaware corporation ("IGL"), by the end of 1997 (the
               "Merger"), and as a condition thereof FTX has, with th
               consent of the Lenders, transferred to FMPO, and FMPO has
               assumed, FTX's interest as managing general partner of FM
               Properties Operating Co., a Delaware general partnership
               ("FMPOC").
                         WHEREAS, in connection therewith, (i) FMPOC, as
               the borrower under the Amended and Restated Credit Agreement
               dated as of December 20, 1996, among FMPOC, FTX, the banks
               party thereto and The Chase Manhattan Bank ("Chase")(the
               "FMPOC Revolving Facility"), and as the borrower under the
               Second Amended and Restated Note Agreement, as amended,
               dated as of June 30, 1995, among FMPOC, FTX, Hibernia
               National Bank and Chase (the "FMPOC Term Loan Facility")
               and (ii) Circle C Land Corp., a Texas corporation ("Circle
               C"), as the borrower under the Amended and Restated Credit
               Agreement dated as of December 20, 1996, between Circle C
               and Texas Commerce Bank National Association (the "Circle 
               Loan Facility", and together with the FMPOC Revolving
               Facility and the FMPOC Term Loan Facility, the "Existing
               Credits"), desire to amend and restate the terms and
               provisions of the Existing Credits and consolidate such
               terms and provisions into the Amended, Restated an
               Consolidated Credit Agreement dated as of the date hereof,
               among FMPOC, Circle C, FMPO, the financial institutions
               listed on the signature pages thereof and Chase, as
               administrative agent and documentary agent thereunder (as
               amended or modified and in effect from time to time, the
               "Consolidated Credit Agreement").

                         WHEREAS, it is the intent of the parties to the
               Consolidated Credit Agreement that the Consolidated Credit
               Agreement (i) shall evidence the Borrower's Debt under the
               Existing Credits, (ii) has been entered into as an
               amendment, restatement and consolidation of the obligations
               of the Borrowers under the Existing Credits and (iii) is in
               no way intended to constitute a novation of any of the
               Borrower's Debt which was evidenced by any of the Existing
               Credits.

                         WHEREAS, it is a condition to the execution of the
               Consolidated Credit Agreement that FMPO execute this
               Guarantee.


                         NOW THEREFORE, in consideration of the premises
               and of the mutual covenants herein contained, FMPO hereby
               agrees as follows:


                                        ARTICLE I

                                        GUARANTEE

                         SECTION 1.01.  Definitions.  (a)  The following
               terms, as used herein, have the following meanings:

                         "Borrowers" means FMPOC and Circle C.

                         "Consolidated Credit Agreement" has the meaning
               assigned to such term in the preamble to this Guarantee.

                         Coverage Period" has the meaning assigned to such
               term in Section 1.04.

                         "FTX Credit Agreement"  means the Credit Agreement
               dated as of November 14, 1996, among FTX, Freeport-McMoRan
               Resource Partners, Limited Partnership, a Delaware limited
               partnership, the banks party thereto and Chase, as
               administrative agent, collateral agent and documentary
               agent.  The FTX Credit Agreement shall automatically mean
               such agreement in the form modified or amended from time to
               time, without the necessity of any further action or
               approval pursuant to this Guarantee.

                         "Loan" means each Loan made under the Consolidated
               Credit Agreement.

                         "Obligations" means the payment of principal an
               interest on the Loans, the reimbursement in full of any
               amounts drawn under a Letter of Credit, and the posting of
               cash collateral in respect of Letters of Credit, and the
               payment of all Fees, expenses and other amounts (including,
               without limitation, indemnities) payable under the Loan
               Documents.

                         (b)  Capitalized terms used herein and not
               otherwise defined herein shall have the meanings ascribed to
               such terms in the Consolidated Credit Agreement.

                         (c)  Unless otherwise stated, Section and Article
               references made herein are to Sections and Articles, as the
               case may be, of this Guarantee.  Except as otherwise
               expressly provided herein, any reference in this Guarantee
               to any Loan Document shall mean such document as amended,
               restated, supplemented or otherwise modified from time to
               time.

                         SECTION 1.02.  The Guarantee.  FMPO hereby
               unconditionally and irrevocably guarantees as a primary
               obligor and not merely as a surety the due and punctual
               payment and performance when and as due (whether at stated
               maturity, by notice of prepayment, upon acceleration or
               otherwise) of the Obligations.  FMPO agrees that it shall
               pay on demand any of the Obligations for which it is liable
               pursuant to this Guarantee which has remained unpaid by the
               relevant Borrower for five Business Days after such amount
               is due or demanded from the relevant Borrower; provided that
               if an event referred to in Section 7.01(h) or (i) of the
               Consolidated Credit Agreement has occurred with respect to a
               Borrower, such amounts shall be payable on demand by FMPO
               without the necessity of any demand on such Borrower.  The
               obligations of FMPO under this Guarantee shall be a
               guarantee of payment and not of collection.  Upon payment by
               FMPO of any sums to a Lender or an Agent as provided above
               in this Guarantee, FMPO shall be subrogated to the rights of
               such Lender or Agent, as applicable, against such Borrower
               with respect to such payment; provided, that all rights of
               FMPO against a Borrower arising as a result thereof by way
               of right of subrogation or otherwise shall in all respect
               be subordinated and junior in right of payment to the prior
               payment in full of all the Obligations to the Lenders and
               the Agents and shall not be exercised by FMPO prior to
               payment in full of all Obligations and termination of the
               Commitments.  If any amount shall be paid to FMPO on account
               of any amount paid by FMPO pursuant to this Guarantee or
               otherwise at any time when all the Obligations shall not be
               paid in full, such amount shall be held in trust by FMPO for
               the benefit of Agents and the Lenders and shall forthwith be
               paid to the Administrative Agent to be credited and applied
               to the Obligations, whether matured or unmatured.  At such
               time as all Obligations owing to each Lender have been paid
               in full and its Commitment terminated, each Lender shall, in
               a reasonable manner, assign (subject to the continued
               effectiveness and the reinstatement provided for above) the
               amount of the Obligations owed to it and paid by FMPO
               pursuant to this Guarantee to FMPO, such assignment to be
               pro tanto to the extent to which the Obligations in question
               were discharged by FMPO, or make such other disposition
               thereof as FMPO shall reasonably direct (all without any
               representation or warranty by, or any recourse to, such
               Lender).

                         SECTION 1.03.  Guarantee Unconditional.  The
               obligations of FMPO hereunder shall be unconditional and
               absolute and, without limiting the generality of the
               foregoing, shall not be released, discharged or otherwise
               affected by:

                         (i) any rescission, extension, renewal,
                    settlement, compromise, waiver or release in respect of
                    any obligation of either Borrower under the
                    Consolidated Credit Agreement, by operation of law or
                    otherwise;

                        (ii) any modification or amendment of or supplement
                    to the Consolidated Credit Agreement;

                       (iii) any guarantee or any release, impairment,
                    non-perfection or invalidity of any direct or indirect
                    security for any obligation of either Borrower under
                    the Consolidated Credit Agreement;

                        (iv) any change in the corporate existence,
                    structure or ownership of either Borrower, or any
                    insolvency, bankruptcy, reorganization or other similar
                    proceeding affecting either Borrower or their
                    respective assets, or any resulting release or
                    discharge of any obligation of either Borrower
                    contained in the Consolidated Credit Agreement;

                         (v) the existence of any claim, set-off or other
                    rights that FMPO may have at any time against either
                    Borrower, any Agent, any Lender or any other
                    corporation or person, whether in connection herewith
                    or any unrelated transactions; provided that, subject
                    to any subordination agreements relating to any such
                    claims, nothing herein shall prevent the assertion of
                    any such claim by separate suit or compulsory
                    counterclaim;

                        (vi) any invalidity or unenforceability relating to
                    or against either Borrower for any reason of the
                    Consolidated Credit Agreement, or any provision of
                    applicable law or regulation purporting to prohibit the
                    payment by either Borrower of the Obligations or any
                    other amount payable by either Borrower under the
                    Consolidated Credit Agreement;

                       (vii) any other act or omission to act or delay of
                    any kind by either Borrower, any beneficiary of this
                    Guarantee, or any other corporation or person, or any
                    other circumstance whatsoever, that might, but for the
                    provisions of this paragraph, constitute a legal or
                    equitable discharge of or defense to FMPO's obligations
                    hereunder or to the Obligations;

                      (viii) any failure of any beneficiary of this
                    Guarantee to assert any claim or demand or to enforce
                    any right or remedy against either Borrower under the
                    provisions of the Consolidated Credit Agreement, any
                    other security document, any intercreditor document or
                    any other loan document; or

                        (ix) any failure of any beneficiary of this
                    Guarantee to exercise any right or remedy against any
                    other guarantor (including any subsidiary) of the
                    Obligations.

                         SECTION 1.04.  Discharge only upon Payment in
               Full; Reinstatement in Certain Circumstances.  FMPO'
               obligations hereunder shall remain in full force and effect
               until the earlier of the date on which (x) the commitments
               under the Consolidated Credit Agreement shall have
               terminated and the Obligations shall have been indefeasibly
               paid in full or (y) indefeasible payment has been made
               hereunder.  If at any time any Obligation is rescinded or
               must be otherwise restored or returned upon the insolvency,
               bankruptcy or reorganization of either Borrower or
               otherwise, FMPO's obligations hereunder with respect to such
               payment shall be reinstated as though such payment had been
               due but not made at the time initially paid.

                         SECTION 1.05.  Waiver by FMPO.  Except to the
               extent set forth in Section 1.02, FMPO irrevocably waives
               acceptance hereof, presentment, demand, protest, notice of
               intent to accelerate, notice of acceleration and any notice
               not provided for herein or in the Consolidated Credit
               Agreement, as well as any requirement that at any time any
               action be taken by any beneficiary of this Guarantee,
               corporation or person against either Borrower, any other
               guarantor or any other entity or person.

                         SECTION 1.06. Stay of Acceleration.  If
               acceleration of the time for payment of any Obligation or
               any other amount payable by either Borrower under the
               Consolidated Credit Agreement is stayed upon the insolvency,
               or reorganization of either Borrower, all such amounts
               otherwise subject to acceleration under the terms of the
               Consolidated Credit Agreement shall nonetheless be payable
               by FMPO hereunder as if no such stay was in effect.


                                        ARTICLE II

                              REPRESENTATIONS AND WARRANTIES

                         SECTION 2.01.  Representations and Warranties.  As
               of the Effective Date and each other date upon which such
               representations and warranties are required to be made or
               deemed made pursuant to Section 6.01(i) of the Consolidated
               Credit Agreement, and for so long as this Guarantee shall
               remain in effect, FMPO shall be deemed to have made to each
               Lender, Issuing Bank and Agent each of the representations
               and warranties of FMPO, as a Restricted Entity, contained in
               Section 3.01 of the Consolidated Credit Agreement, as may be
               in effect from time to time, which representations and
               warranties, along with the definitions of the terms utilized
               therein and any related provisions, as the same may be
               amended, restated or otherwise modified from time to time,
               are hereby incorporated by reference herein and shall apply
               with the same force and effect as though set forth herein in
               their entirety.


                                       ARTICLE III

                                        COVENANTS

                         SECTION 3.01.  Affirmative Covenants of FMPO.  
               From and after the Effective Date and so long as this
               Guarantee shall remain in effect and until the Commitments
               have been terminated and the principal of and interest on
               each Loan, all Fees and all other expenses or amounts
               payable under any Loan Document shall have been paid in full
               and all Letters of Credit have been canceled or have expired
               and all amounts drawn thereunder have been reimbursed in
               full, unless the Required Lenders otherwise provide prior
               written consent, FMPO shall at all times be in full
               compliance with the covenants and agreements of FMPO, as a
               Restricted Entity, contained in Section 5.01 of the
               Consolidated Credit Agreement, as may be in effect from time
               to time, which covenants and agreements, as the same may be
               amended, restated or otherwise modified from time to time,
               are hereby incorporated by reference herein and shall apply
               with the same force and effect as though set forth herein in
               their entirety.

                         SECTION 3.02.  Negative Covenants of FMPO.  From
               and after the Effective Date and so long as this Agreement
               shall remain in effect and until the Commitments have been
               terminated and the principal of and interest on each Loan,
               all Fees and all other expenses or amounts payable under any
               Loan Document have been paid in full, and all Letters of
               Credit have been canceled or have expired and all amounts
               drawn thereunder have been reimbursed in full, without the
               prior written consent of the Required Lenders, FMPO shall
               not at any time fail to be in full compliance with the
               covenants and agreements of FMPO, as a Restricted Entity,
               contained in Section 5.02 of the Consolidated Credit
               Agreement, as may be in effect from time to time, which
               covenants and agreements, as the same may be amended,
               restated or otherwise modified from time to time, are hereby
               incorporated by reference herein and shall apply with the
               same force and effect as though set forth herein in their
               entirety.


                                        ARTICLE IV

                                      MISCELLANEOUS

                         SECTION 4.01.  Successors and Assigns.  Subject to
               Section 1.04, this Guarantee shall be binding upon and inure
               to the benefit of the Borrowers, the Lenders, the Issuing
               Banks, the Agents and their respective successors and
               assigns, except that FMPO may not assign, delegate or
               transfer any of its rights or obligations hereunder or any
               interest herein (and any such attempted assignment,
               delegation or transfer shall be void).

                         SECTION 4.02.  Waivers; Amendments.  (a) No
               failure or delay of any Lender, Issuing Bank or Agent in
               exercising any power or right hereunder shall operate as a
               waiver thereof, nor shall any single or partial exercise of
               any such right or power, or any abandonment or
               discontinuance of steps to enforce such a right or power,
               preclude any other or further exercise thereof or the
               exercise of any other right or power.  The rights and
               remedies of the Lenders, the Issuing Banks and the Agents
               hereunder and under the other documents and agreements
               entered into in connection herewith are cumulative and not
               exclusive of any rights or remedies which they would
               otherwise have.  No waiver of any provision of this
               Guarantee or consent to any departure by FMPO therefrom
               shall in any event be effective unless the same shall be
               authorized as provided in paragraph (b) below, and then such
               waiver or consent shall be effective only in the specific
               instance and for the purpose for which given.  No notice or
               demand on FMPO in any case shall entitle FMPO to any other
               or further notice or demand in similar or other
               circumstances.

                         (b) This Agreement (including any provision
               hereof) may not be waived, amended or modified except
               pursuant to an agreement or agreements in writing entered
               into between FMPO and the Administrative Agent, with the
               prior written consent of the Required Lenders.

                         SECTION 4.03.  Survival of Guarantee.  All
               covenants, agreements, representations and warranties made
               by FMPO herein and in the certificates or other instruments
               prepared or delivered in connection with this Guarantee or
               any other Loan Document shall be considered to have been
               relied upon by the Lenders, the Issuing Banks and the Agents
               and shall survive the making by the Lenders of the Loans or
               the issuing of Letters of Credit by the Issuing Banks
               regardless of any investigation made by the Lenders or
               Issuing Banks, as applicable, or by their respective
               representatives or agents, and shall continue in full force
               and effect as long as the principal of or any accrued
               interest on any Loan, L/C Disbursement, Fee or other fee or
               amount payable under the Loan Documents is outstanding an
               unpaid and so long as the Commitments or any outstanding
               Letters of Credit issued under the Consolidated Credit
               Agreement have not been terminated or have not expired.

                         SECTION 4.04.  Governing Law; Submission to
               Jurisdiction.  This Guarantee shall be governed by and
               construed in accordance with the laws of the State of New
               York.  FMPO hereby submits to the nonexclusive jurisdiction
               of the United States District Court for the Southern
               District of New York and of any New York State court sitting
               in New York City for purposes of all legal proceedings
               arising out of or relating to this Guarantee.  FMPO
               irrevocably waives, to the fullest extent permitted by law,
               any objection that it may now or hereafter have to the
               laying of the venue of any such proceeding brought in such a
               court and any claim that any such proceeding brought in such
               a court has been brought in an inconvenient forum.um.

                         SECTION 4.05.  Waiver of Jury Trial.  FMPO hereby
               irrevocably waives any and all right to trial by jury in any
               legal proceeding arising out of or relating to this
               Guarantee.

                         SECTION 4.06.  Notices.  All notices, requests any
               other communications shall be in writing (including
               facsimile transmission or similar writing) and shall be
               mailed or sent by the sending party to: (i) in the case of
               FMPO, at its address set forth in Section 10.01 of the
               Consolidated Credit Agreement or as otherwise notified to
               the beneficiaries of this Guarantee or (ii) in the case of
               any other party, at its address set forth in the Loan
               Document
                         IN WITNESS WHEREOF, FMPO has caused this Guarantee
               to be duly executed by its officer thereunto duly
               authorized, as of the day and year first above written.


                                             FM PROPERTIES INC.,

                                             by /s/ Robert R. Boyce
                                                -------------------            
                                                Name:Robert R. Boyce
                                                Title: Treasurer