1 NOTICE OF GUARANTEED DELIVERY FOR SHARES OF SERIES A 8% CUMULATIVE CONVERTIBLE PREFERRED STOCK OF MESA INC. SUBSCRIBED FOR UNDER THE BASIC SUBSCRIPTION AND THE OVERSUBSCRIPTION PRIVILEGE As set forth in the Prospectus under "The Rights Offering -- Exercise of Rights," this form or one substantially equivalent hereto may be used as a means of effecting subscription and payment for all shares of Mesa's Series A 8% Cumulative Convertible Preferred Stock. Such form may be delivered by hand or sent by telex, facsimile transmission, overnight courier or mail to the Subscription Agent. The Subscription Agent is: AMERICAN STOCK TRANSFER AND TRUST COMPANY Attention: Corporate Stock Transfer Department By Mail By Facsimile By Hand 40 Wall Street, 46th Floor (718) 234-5001 40 Wall Street, 46th Floor New York, NY 10005 New York, NY 10005 Confirm by telephone to: (718) 921-8200 By Overnight Courier: Corporate Stock Transfer Department 40 Wall Street, 46th Floor New York, NY 10005 DELIVERY OF THIS INSTRUMENT TO AN ADDRESS, OR TRANSMISSION OF INSTRUCTIONS VIA A TELECOPY FACSIMILE NUMBER, OTHER THAN AS SET FORTH ABOVE, DOES NOT CONSTITUTE A VALID DELIVERY The New York Stock Exchange member firm or bank or trust company which completes this form must communicate the guarantee and the number of Shares subscribed for (under both the Basic Subscription Privilege and the Oversubscription Privilege) to the Subscription Agent and must deliver this Notice of Guaranteed Delivery of Payment, guaranteeing delivery of (a) payment in full for all subscribed shares and (b) a properly completed and signed copy of the Subscription Certificate to the Subscription Agent prior to 5:00 p.m., New York City time, on the Expiration Date. Failure to do so will result in a forfeiture of the Rights. GUARANTEE The undersigned, a member firm of the New York Stock Exchange or a bank or trust company having an office or correspondent in the United States, guarantees delivery to the Subscription Agent by the close for business on [ , 1996], of (a) a properly completed and executed Subscription Form, and (b) payment of the full Subscription Price for Shares subscribed for pursuant to the Basic Subscription Privilege and any additional Shares subscribed for pursuant to the Oversubscription Privilege, a subscription for such Shares is indicated herein or in the Subscription Form. Number of Rights to be delivered ------------------------ Method of delivery (circle one) A. Through DTC* B. Direct to Subscription Agent 2 - ------------------------------------------------------ ------------------------------------------------------ Number of Shares of Basic Subscription Privilege Number of Shares of Oversubscription Privilege - ------------------------------------------------------ ------------------------------------------------------ Name of Firm Authorized Signature - ------------------------------------------------------ ------------------------------------------------------ Address Title - ------------------------------------------------------ Name ------------------------------------------------- Zip Code (Please Type or Print) - ------------------------------------------------------ ------------------------------------------------------ Contact Name Phone Number - --------------- * IF THE RIGHTS ARE DELIVERED THROUGH DTC, A REPRESENTATIVE OF AMERICAN STOCK TRANSFER AND TRUST COMPANY WILL PHONE YOU WITH A PROTECT IDENTIFICATION NUMBER, WHICH NEEDS TO BE RELATED BY YOU TO DTC.