EXHIBIT 23.2

                                 March 23, 2001


MarkWest Hydrocarbon, Inc.
155 Inverness Drive West, Suite 200
Englewood, Colorado 80112


Ladies and Gentlemen:


     Cawley, Gillespie & Associates, Inc. hereby consents to the use of the oil
and gas reserve information in the MarkWest Hydrocarbon, Inc. Securities &
Exchange Commission Form 10-K for the year ended December 31, 2000 and in the
MarkWest Hydrocarbon, Inc. Annual Report for the year ended December 31, 2000
based on reserve reports prepared by Cawley, Gillespie & Associates, Inc. and
dated March 5, 2001.


                                        Sincerely,



                                        CAWLEY, GILLESPIE & ASSOCIATES, INC.