Exhibit 1a


                               Summa Metals, Inc.
                      28281 Crown Valley Parkway Suite 225
                            Laguna Niguel, CA 92677

                               December 13, 1999

Boe & Company
3668 So. Jasper St.
Aurora, CO  80013

Re:  Registration Statement for 510,000 Units of Summa Metals Corp.

Gentlemen:

The  Registration  Statement on Form SB-2 of Summa Metals Corp.  (the "Company")
for a maximum of 510,000 Units of the Company's common stock became effective on
June 17, 1999 (the "Effective Date").  Pursuant to the Underwriting Agreement by
and between the Company and Boe & Company as  underwriter  (the  "Underwriter"),
the Offering Period of the Registration Statement was 90 days from the Effective
Date plus an additional 90 days, if extended by the Company and the Underwriter,
which extension was implemented.

The  purpose of this  letter is to confirm  our mutual  agreement  to extend the
Offering  Period for an  additional  90 days from December 17, 1999. It has been
agreed by and between the Company and the Underwriter,  that the Offering Period
for sale of Units of the Company's  common  stock,  be extended for 90 days from
December  17,  1999 upon all the same terms and  conditions  as set forth in the
Underwriting  Agreement  filed  as  Exhibit  1  to  the  Company's  Registration
Statement on Form SB-2. The Company and the Underwriter  hereby  acknowledge and
agree that all conditions to their respective obligations and all the covenants,
agreements,  representations  and  warranties  made  by  each  of  them  in  the
Underwriting  Agreement  are hereby  ratified and  affirmed  with full force and
affect as though completely set forth herein.

Please confirm the extension of the  Underwriting  Agreement as set forth above,
by signing and returning the enclosed copy of this letter.

                                                    Very truly yours,

                                                    Summa Metals Corp.

                                                By: /s/Michael Chaffee
                                                    --------------------------
                                                    Michael Chaffee, President

The foregoing extension of the Underwriting
Agreement is hereby consented, accepted
and agreed to:

Boe & Company


By:
   ------------------------
   Jeffrey Boe, President