EXHIBIT 3.159

    STATE OF DELAWARE
   SECRETARY OF STATE
DIVISION OF CORPORATIONS
FILED 04:30 PM 11/29/1999
  991508889 - 3132605

                          CERTIFICATE OF INCORPORATION

                                       OF

                          PEABODY ENTERPRISES, INC. II

                                    * * * * *

         1.       The name of the corporation is Peabody Enterprises, Inc. II.

         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) and the
                  par value of each of such shares is Ten Dollars and No Cents
                  ($10.00), amounting in the aggregate to One Thousand Dollars
                  and No Cents ($1000.00).

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

     NAME                                               MAILING ADDRESS

M. M. Grabowski                            1209 Orange St., Wilmington, DE 19801

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

         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.

                                      -1-



         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 of 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.

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

         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.

          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 29th day of
November, 1999.

                                                            /s/ M. M. Grabowski
                                                            -------------------
                                                                M. M. Grabowski

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

                                       -2-



                            CERTIFICATE OF AMENDMENT

                                       OF

                          CERTIFICATE OF INCORPORATION
                                     *****

Peabody Enterprises, Inc. II a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware,

         DOES HEREBY CERTIFY.

         FIRST: That the Board of Directors of said corporation, by the
unanimous written consent of its members, filed with the minutes of the Board
adopted a resolution proposing and declaring advisable the following amendment
to the Certificate of Incorporation of said corporation:

         RESOLVED, that the Certificate of Incorporation of Peabody Enterprises,
         Inc. II be amended by changing the First Article thereof so that, as
         amended, said Article shall be and read as follows:

                  The name of the corporation is Lem Branch Energy, Inc.

         SECOND: That in lieu of a meeting and vote of stockholders, the
stockholders have given unanimous written consent to said amendment in
accordance with the provisions of Section 228 of the General Corporation Law of
the State of Delaware.

         THIRD: That the aforesaid amendment was duly adopted in accordance with
the provisions of Section 242 and 228 of the General Corporation Law of the
State of Delaware.

                                                           STATE OF DELAWARE
                                                          SECRETARY OF STATE
                                                       DIVISION OF CORPORATIONS
                                                       FILED 11:00 AM 09/07/2000
                                                          001451973 - 3132605


         IN WITNESS WHEREOF, said Peabody Enterprises, Inc. II has caused this
certificate to be signed by S. F. Schaab, its Vice President and Treasurer, this
6th day of September, 2000.

                                                 PEABODY ENTERPRISES, INC. II

                                                 By /s/  Steven F. Schaab
                                                    ----------------------------
                                                    Vice President and Treasurer



                                                           STATE OF DELAWARE
                                                          SECRETARY OF STATE
                                                        DIVISION OF CORPORATIONS
                                                       FIELD 11:00 AM 09/20/2000
                                                          001473808 - 3132605

                            CERTIFICATE OF AMENDMENT

                                       OF

                          CERTIFICATE OF INCORPORATION
                                     *****

Lem Branch Energy, Inc. a corporation organized and existing under and by
virtue of the General Corporation Law of the State of Delaware.

         DOES HEREBY CERTIFY:

         FIRST: That the Board of Directors of said corporation, by the
unanimous written consent of its members, filed with the minutes of the Board
adopted a resolution proposing and declaring advisable the following amendment
to the Certificate of Incorporation of said corporation:

         RESOLVED, that the Certificate of Incorporation of Lem Branch Energy,
         Inc. be amended by changing the First Article thereof so that, as
         amended, said Article shall be and read as follows:

                  The name of the Corporation is Rivers Edge Mining, Inc.

         SECOND: That in lieu of a meeting and vote of stockholders, the
stockholders have given unanimous written consent to said amendment in
accordance with the provisions of Section 228 of the General Corporation Law of
the State of Delaware.

         THIRD: That the aforesaid amendment was duly adopted in accordance with
the provisions of Section 242 and 228 of the General Corporation Law of the
State of Delaware.

                                                LEM BRANCH ENERGY, INC.

                                                By /s/ Steven F. Schaab
                                                   ----------------------------
                                                   Vice President and Treasurer
                                                   Steven F. Schaab