SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G
                                (RULE 13d - 102)

      INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO 13d-1(b),
            (c) AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d

                                (Amendment No.)*
         Pan American Silver Corp.
-----------------------------------
(Name of Issuer)

         Common Stock
-----------------------------------
(Title of Class of Securities)

         697900108
-----------------------------------
(CUSIP Number)

         March 12, 2004
----------------------------------
(Date of Event which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

[ ]      Rule 13d-1(b)
[x]      Rule 13d-1(c)
[ ]      Rule 13d-1(d)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).



1.       NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                  Amaranth LLC

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

         (a)      [x]
         (b)      [ ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION

                  Cayman Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

5.       SOLE VOTING POWER

                  0

6.       SHARED VOTING POWER

                  4,663,218
         ----------------------

7.       SOLE DISPOSITIVE POWER

                  0

8.       SHARED DISPOSITIVE POWER

                  4,663,218
         ----------------------

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  See 6 and 8 above.

10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
         EXCLUDES CERTAIN SHARES*   [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                  8.0%
         ----------------------

12.      TYPE OF REPORTING PERSON*

                  CO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



1.       NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                  Isotope Limited

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

         (a)      [x]
         (b)      [  ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION

                  Cayman Islands

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

5.       SOLE VOTING POWER

                  0

6.       SHARED VOTING POWER

                  4,663,218
         ----------------------

7.       SOLE DISPOSITIVE POWER

                  0

8.       SHARED DISPOSITIVE POWER

                  4,663,218
         ----------------------

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  See 6 and 8 above.

10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
         EXCLUDES CERTAIN SHARES*   [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                  8.0%
         ----------------------

12.      TYPE OF REPORTING PERSON*

                  CO

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


1.       NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                  Amaranth Advisors L.L.C.

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

         (a)      [x]
         (b)      [ ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION

                  Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH:

5.       SOLE VOTING POWER

                  0

6.       SHARED VOTING POWER

                  4,663,218
         ----------------------

7.       SOLE DISPOSITIVE POWER

                  0

8.       SHARED DISPOSITIVE POWER

                  4,663,218
         ----------------------

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                  See 6 and 8 above.

10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
         EXCLUDES CERTAIN SHARES*   [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                  8.0%
         ----------------------

12.      TYPE OF REPORTING PERSON*

                  IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


1.       NAMES OF REPORTING PERSONS
         I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

                  Nicholas M. Maounis

2.       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

         (a)      [x]
         (b)      [ ]

3.       SEC USE ONLY

4.       CITIZENSHIP OR PLACE OF ORGANIZATION

                  United States

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

5.       SOLE VOTING POWER

                  0

6.       SHARED VOTING POWER

                  4,663,218
         ----------------------

7.       SOLE DISPOSITIVE POWER

                  0

8.       SHARED DISPOSITIVE POWER

                  4,663,218
         ----------------------

9.       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
                  See 6 and 8 above.

10.      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
         EXCLUDES CERTAIN SHARES*   [ ]

11.      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

                  8.0%
         ----------------------

12.      TYPE OF REPORTING PERSON*

                  IN, HC

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



ITEM 1(a).        Name of Issuer:

         Pan American Silver Corp.
-------------------------------------

Item 1(b).        Address of Issuer's Principal Executive Offices:

1500-625 Howe Street
--------------------
Vancouver, British Columbia V6C 2T6
-----------------------------------
Canada
------

Item 2(a).        Name of Persons Filing:
Item 2(b).        Address of Principal Business Office or, if None, Residence:
Item 2(c).        Citizenship:

         Amaranth LLC
         c/o Amaranth Advisors L.L.C.
         One American Lane
         Greenwich, Connecticut 06831
         Cayman Islands company

         Isotope Limited
         c/o Amaranth Advisors L.L.C.
         One American Lane
         Greenwich, Connecticut 06831
         Cayman Islands company

         Amaranth Advisors L.L.C.
         One American Lane
         Greenwich, Connecticut 06831
         Delaware limited liability company

         Nicholas M. Maounis
         c/o Amaranth Advisors L.L.C.
         One American Lane
         Greenwich, Connecticut 06831
         U.S. Citizen

Amaranth  Advisors  L.L.C.  is the  trading  advisor  for each of  Amaranth  LLC
("Amaranth")  and Isotope Limited  ("Isotope")  and has been granted  investment
discretion  over  portfolio  investments,  including the  Securities (as defined
below),  held by each of  them.  Maounis  is the  managing  member  of  Amaranth
Advisors L.L.C. and may, by virtue of his position as managing member, be deemed
to have power to direct the vote and disposition of the Securities held for each
of Amaranth and Isotope.

Item 2(d).        Title of Class of Securities

                  Common Stock, No Par Value ("Securities")
                  -----------------------------------------

Item 2(e).        CUSIP Number:     697900108
                                    ---------




Item 3. If This  Statement is Filed  Pursuant to Rule  13d-1(b), or 13d-2(b) or
        (c), Check Whether the Person Filing is a:

          (a)  [ ]   Broker or dealer registered under Section 15 of the
                     Exchange Act.

          (b)  [ ]   Bank as defined in Section 3(a)(6) of the Exchange Act.

          (c)  [ ]   Insurance company defined in Section 3(a)(19) of the
                     Exchange Act.

          (d)  [ ]   Investment company registered under Section 8 of the
                     Investment Company Act.

          (e)  [ ]   An investment adviser in accordance with
                     Rule 13d-1(b)(1)(ii)(E).

          (f)  [ ]   An employee benefit plan or endowment fund in accordance
                      with Rule 13d-1(b)(1)(ii)(F).

          (g)  [ ]   A parent holding company or control person in accordance
                      with Rule 13d-1(b)(1)(ii)(G).

          (h)  [ ]   A savings association as defined in Section 3(b) of the
                     Federal Deposit Insurance Act.

          (i)  [ ]   A church plan that is excluded  from the  definition of
                     an  investment  company  under Section  3(c)(14) of the
                     Investment Company Act;

          (j)  [ ]   Group, in accordance with Rule 13d-1(b)(1)(ii)(J).

If this statement is filed pursuant to Rule 13d-1(c), check this box [x]

Item 4.   Ownership.

          Provide the following  information  regarding the  aggregate  number
and  percentage of the class of securities of the issuer identified in Item 1.

          (a)     Amount beneficially owned:

                        4,663,218
                  ------------------

          (b)     Percent of class:

                         8.0%
                  ------------------

          (c)      Number of shares as to which such person has:

                   (i)  Sole power to vote or direct the vote

                           0




                  (ii)  Shared power to vote or to direct the vote

                           See Item 4(a).

                  (iii)  Sole power to dispose or to direct the disposition of

                           0

                  (iv)  Shared power to dispose or to direct the disposition of

                        See Item 4(a).


Item 5.   Ownership of Five Percent or Less of a Class.

          If this  statement  is being filed to report the fact that as of the
          date hereof the  Reporting  Persons have ceased to be the beneficial
          owner of more than five percent of the class of securities, check the
          following [ ].  Not applicable.

Item 6.   Ownership of More than Five Percent on Behalf of Another Person.

          Shareholders of Amaranth and Isotope indirectly  participate in the
          receipt of dividends from, and proceeds from the sale of, the
          Securities held for the account of Amaranth and Isotope.

Item 7.   Identification and Classification of the Subsidiary Which Aquired the
          Security Being Reported on by the Parent Holding Company.

          Not applicable.

Item 8.   Identification and Classification of Members of the Group.

          See Item 2(c) in lieu of an Exhibit.

Item 9.   Notice of Dissolution of Group.

          Not applicable.

Item 10.  Certification.

          By signing below the  undersigned  certifies that, to the best of its
          knowledge and belief,  the securities  referred to above were not
          acquired  and are not held for the  purpose of or with the effect of
          changing or influencing  the control of the issuer of the securities
          and were not acquired and are not held in connection with or as a
          participant in any transaction having that purpose or effect.



                                   SIGNATURES

     After reasonable inquiry and to the best of its knowledge and belief, each
of the undersigned  certifies that the information with respect to it set forth
in this statement is true, complete, and correct.


Dated:   March 16, 2004
         -----------------

          AMARANTH LLC,
                   by Amaranth Advisors L.L.C., as Trading Advisor

                   By:  /s/ Nicholas M. Maounis
                        -------------------------------
                        Nicholas M. Maounis,
                        Managing Member

          ISOTOPE LIMITED,
                   by Amaranth Advisors L.L.C., as Trading Advisor

                   By:  /s/ Nicholas M. Maounis
                        -------------------------------
                        Nicholas M. Maounis,
                        Managing Member

          AMARANTH ADVISORS L.L.C.

                   By:  /s/ Nicholas M. Maounis
                        -------------------------------
                        Nicholas M. Maounis,
                        Managing Member


          /s/ Nicholas M. Maounis
          -------------------------------
          Nicholas M. Maounis


                                    EXHIBIT A
                             JOINT FILING AGREEMENT

The  undersigned  hereby agree that the statement on Schedule 13G signed by each
of the undersigned shall be, filed on behalf of each of the undersigned pursuant
to and in accordance  with the  provisions of Rule 13d-1(k) under the Securities
Exchange Act of 1934, as amended.

Dated:    March 16, 2004
       ------------------

          AMARANTH LLC
                   by Amaranth Advisors L.L.C., as Trading Advisor

                   By:  /s/ Nicholas M. Maounis
                        ---------------------------
                        Nicholas M. Maounis,
                        Managing Member

          ISOTOPE LIMITED
                   by Amaranth Advisors L.L.C., as Trading Advisor

                   By:  /s/ Nicholas M. Maounis
                        ---------------------------
                        Nicholas M. Maounis,
                        Managing Member

          AMARANTH ADVISORS L.L.C.

                   By:  /s/ Nicholas M. Maounis
                        ---------------------------
                        Nicholas M. Maounis,
                        Managing Member


          /s/ Nicholas M. Maounis
          ---------------------------
          Nicholas M. Maounis