EXHIBIT 3.71

                                                           STATE OF DELAWARE
                                                           SECRETARY OF STATE
                                                       DIVISION OF CORPORATIONS
                                                       FILED 01:30 PM 05/06/1999
                                                          991180552 - 3039050

                          CERTIFICATE OF INCORPORATION

                                       OF

                             HIGHLAND MINING COMPANY

                                    * * * * *

         1. The name of the corporation is HIGHLAND MINING COMPANY

         2. The address of its registered office in the State of Delaware is
Corporation Trust Center, 1209 Orange Street, in the City of Wilmington, County
of New Castle. The name of its registered agent at such address is The
Corporation Trust Company.

         3. The nature of the business or purposes to be conducted or promoted
is:

                  To engage in any lawful act or activity for which corporations
may be organized under the General Corporation Law of Delaware.

         4. The total number of shares of stock which the corporation shall have
authority to issue is one hundred (100) with a par value of Ten Dollars ($10.00)
per share amounting to an aggregate of One Thousand Dollars ($l,000.00).

         The designations and the powers, preferences and rights, and the
qualifications, limitations or restrictions thereof are as follows:

         At all elections of directors of the corporation, each stockholder
shall be entitled to as many votes as shall equal the number of votes which
(except for such provision as to cumulative voting) he would be entitled to cast
for the election of directors with respect to his shares of stock multiplied by
the number of directors to be elected by him, and he may cast all of such votes
for a single director or may distribute them among the number to be voted for,
or for any two or more of them as he may see fit.

         5A. The name and mailing address of each incorporator is as follows:

    NAME                                          MAILING ADDRESS

L. J. Vitalo                          1209 Orange Street, Wilmington, DE 19801

D. J. Murphy                          1209 Orange Street, Wilmington, DE 19801

E. L. Reilly                          1209 Orange Street, Wilmington, DE 19801

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         5B. The name and mailing address of each person who is to serve as a
director until the first annual meeting of the stockholders or until a successor
is elected and qualified, is as follows:

    NAME                                       MAILING ADDRESS
M. A. Haaga                      701 Market St., Ste. 900, St. Louis, MO 63101
R. B. Walcott                    701 Market St., Ste. 900, St. Louis, MO 63101
R. M. Whiting                    701 Market St., Ste. 900, St. Louis, MO 63101

         6. The corporation is to have perpetual existence.

         7. In furtherance and not in limitation of the powers conferred by
statute, the board of directors is expressly authorized:

         To make, alter or repeal the by-laws of the corporation.

         To authorize and cause to be executed mortgages and liens upon the real
and personal property of the corporation.

         To set apart out of any of the funds of the corporation available for
dividends a reserve or reserves for any proper purpose and to abolish any such
reserve in the manner in which it was created.

         To designate one or more committees, each committee to consist of one
or more of the directors of the corporation. The board may designate one or more
directors as alternate members of any committee, who may replace any absent or
disqualified member at any meeting of the committee. The by-laws may provide
that in the absence or disqualification of a member of a committee, the member
or members present at any meeting and not disqualified from voting, whether or
not such member or members constitute a quorum, may unanimously appoint another
member of the board of directors to act at the meeting in the place of any such
absent or disqualified member. Any such committee, to the extent provided in the
resolution of the board of directors, or in the by-laws of the corporation shall
have and may exercise all the powers and authority of the board of directors in
the management of the business and affairs of the corporation, and may authorize
the seal of the corporation to be affixed to all papers which may require it;
but no such committee shall have the power or authority in reference to the
following matters: (i) approving or adopting, or recommending to the
stockholders, any action or matter expressly required by the Delaware General
Corporation Law to be submitted to stockholders for approval or (ii) adopting,
amending or repealing any by-law of the corporation.

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         When and as authorized by the stockholders in accordance with law, to
sell, lease or exchange all or substantially all of the property and assets of
the corporation, including its good will and its corporate franchises, upon such
terms and conditions and for such consideration, which may consist in whole or
in part of money or property including shares of stock in, and/or other
securities of, any other corporation or corporations, as its board of directors
shall deem expedient and for the best interests of the corporation.

         8. Elections of directors need not be by written ballot unless the
by-laws of the corporation shall so provide.

         Meetings of stockholders may be held within or without the State of
Delaware, as the by-laws may provide. The books of the corporation may be kept
(subject to any provision contained in the statutes) outside the State of
Delaware at such place or places as may be designated from time to time by the
board of directors or in the by-laws of the corporation.

         Whenever a compromise or arrangement is proposed between this
corporation and its creditors or any class of them and/or between this
corporation and its stockholders or any class of them, any court of equitable
jurisdiction within the State of Delaware may, on the application in a summary
way of this corporation or of any creditor or stockholder thereof or on the
application of any receiver or receivers appointed for this corporation under
the provisions of Section 291 of Title 8 of the Delaware Code or on the
application of trustees in dissolution or of any receiver or receivers appointed
for this corporation under the provisions of Section 279 of Title 8 of the
Delaware Code order a meeting of the creditors or class of creditors, and/or of
the stockholders or class of stockholders of this corporation, as the case may
be, to be summoned in such manner as the said court directs. If a majority in
number representing three-fourths in value of the creditors or class of
creditors, and/or of the stockholders or class of stockholders of this
corporation, as the case may be, agree to any compromise or arrangement and to
any reorganization of this corporation as a consequence of such compromise or
arrangement, the said compromise or arrangement and the said reorganization
shall, if sanctioned by the court to which the said application has been made,
be binding on all the creditors or class of creditors, and/or on all the
stockholders or class of stockholders, of this corporation, as the case may be,
and also on this corporation.

         9. The corporation reserves the right to amend, alter, change or repeal
any provision contained in this Certificate of Incorporation, in the manner now
or hereafter prescribed by statute, and all rights conferred upon stockholders
herein are granted subject to this reservation.

         10. A director of the corporation shall not be personally liable to the
corporation or its stockholders for monetary damages for breach of fiduciary
duty as a director except for liability (i) for any breach of the director's
duty of loyalty to the corporation or its stockholders, (ii) for acts or
omissions not in good faith or which involve intentional misconduct or a knowing
violation of law, (iii) under Section 174 of the Delaware General Corporation
Law, or (iv) for any transaction from which the director derived any improper
personal benefit.

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         WE, THE UNDERSIGNED, being each of the incorporators hereinbefore
named, for the purpose of forming a corporation pursuant to the General
Corporation Law of the State of Delaware, do make this Certificate, hereby
declaring and certifying that this is our act and deed and the facts herein
stated are true, and accordingly have hereunto set our hands this Sixth day of
May, 1999.

                                             /s/ L. J. Vitalo
                                             ----------------------
                                                 L. J. Vitalo

                                             /s/ D. J. Murphy
                                             ----------------------
                                                 D. J. Murphy

                                             /s/ E. L. Reilly
                                             ----------------------
                                                 E. L. Reilly

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