EX-5.1 2 a2149638zex-5_1.htm EXHIBIT 5.1
QuickLinks -- Click here to rapidly navigate through this document


Exhibit 5.1

GRAPHIC

January 10, 2005

To:   United States Securities and Exchange Commission

Re:
 
Harvest Operations Corp, Harvest Energy Trust and Subsidiaries ("Harvest") — Registration Statement on Form F-10
        

We hereby consent to the use of and reference to our name and our reports, and the inclusion and incorporation by reference of information derived from our report evaluating a portion of Harvest's petroleum and natural gas reserves relating as at July 1, 2004, in the registration statement on Form F-10 of Harvest.

Sincerely,

McDaniel & Associates Consultants Ltd.

/s/  P. A. WELCH      
P. A. Welch, P. Eng
Executive Vice President

Calgary, Alberta

Suite 2200, Bow Valley Square 3, 255-5th Avenue S.W., Calgary, Alberta T2P 3G6
Tel: (403) 262-5506  Fax: (403) 233-2744  Email: mcdaniel@mcdan.com  Website: www. mcdan.com



QuickLinks