Exhibit 99.1


                             Joint Filing Agreement

     The undersigned hereby agree that the statement on Schedule 13G with
respect to the common stock of Alpha Natural Resources, Inc. is, and any
amendment thereto signed by each of the undersigned shall be, filed on behalf of
each undersigned pursuant to and in accordance with the provisions of 13d-1(k)
under the Securities Exchange Act of 1934, as amended, and that all subsequent
amendments to this statement on Schedule 13G shall be filed on behalf of each of
the undersigned without the necessity of filing additional joint filing
agreements. The undersigned acknowledge that each shall be responsible for the
timely filing of such amendments, and for the completeness and accuracy of the
information concerning it contained therein, but shall not be responsible for
the completeness and accuracy of the information concerning the other, except to
the extent that it knows or has reason to believe that such information is
inaccurate.

Dated:  June 24, 2009

                                         DUQUESNE CAPITAL MANAGEMENT, L.L.C.


                                          By:  /s/ Gerald Kerner
                                               ------------------------
                                               Name:  Gerald Kerner
                                               Title: Managing Director




                                          STANLEY F. DRUCKENMILLER


                                          By:  /s/ Gerald Kerner
                                               -----------------------
                                               Name:  Gerald Kerner
                                               Title: Attorney-in-Fact






                    [JOINT FILING AGREEMENT FOR SCHEDULE 13G
                 WITH RESPECT TO ALPHA NATURAL RESOURCES, INC.]