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                                                                    EXHIBIT 23.5


                   [BANC OF AMERICA SECURITIES LLC LETTERHEAD]

                                August 31, 2001


Board of Directors
Apco Argentina Inc.
One Williams Center
Tulsa, Oklahoma 74172

Ladies and Gentlemen:

We hereby consent to the inclusion of our opinion letter, dated April 5, 2001 to
the Board of Directors of Apco Argentina Inc. (the "Company") regarding the
proposed merger (the "Merger") of Globex Energy, Inc. with a wholly owned
subsidiary of the Company in the Company's Amendment No. 1 to the Registration
Statement on Form S-4, dated August 31, 2001, to which this consent is filed as
an exhibit (the "Registration Statement") and to the references in the
Registration Statement to our firm and to our opinion under the headings
"Opinion of Financial Advisor", "Background of the Merger", "Factors Considered
by, and Recommendation of, the Apco Board" and "Opinion of Apco's Financial
Advisor". In giving the foregoing consent, we do not admit (1) that we come
within the category of persons whose consent is required under Section 7 of the
Securities Act of 1933, as amended (the "Securities Act"), or the rules and
regulations of the Securities and Exchange Commission (the "Commission")
promulgated thereunder and (2) that we are experts with respect to any part of
the Registration Statement within the meaning of the term "experts" as used in
the Securities Act and the rules and regulations of the Commission promulgated
thereunder.

Very truly yours,

/s/ BANC OF AMERICA SECURITIES LLC

BANC OF AMERICA SECURITIES LLC