UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 --------------------- SCHEDULE 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13D-1(b), (c) and (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13D-2(b) (Amendment No. 5)(1) Apex Silver Mines Limited -------------------------------------------------------------------------------- (Name of Issuer) Ordinary Shares, $0.01 Par Value -------------------------------------------------------------------------------- (Title of Class of Securities) G04074103 -------------------------------------------------------------------------------- (CUSIP Number) December 31, 2005 -------------------------------------------------------------------------------- (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) |_| Rule 13d-1 (c) |X| Rule 13d-1 (d) ---------- (1) 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 the 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 or otherwise subject to the liabilites of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). CUSIP No. G04074103 13G Page 2 of 5 Pages -------------------------------------------------------------------------------- 1. NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Thomas S. Kaplan -------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [_] (b) [_] -------------------------------------------------------------------------------- 3. SEC USE ONLY -------------------------------------------------------------------------------- 4. CITIZENSHIP OR PLACE OF ORGANIZATION United States -------------------------------------------------------------------------------- 5. SOLE VOTING POWER 1,061,792 ----------------------------------------------------------------- NUMBER OF 6. SHARED VOTING POWER SHARES BENEFICIALLY 0 OWNED BY ----------------------------------------------------------------- EACH 7. SOLE DISPOSITIVE POWER REPORTING PERSON 1,061,792 WITH ----------------------------------------------------------------- 8. SHARED DISPOSITIVE POWER 0 -------------------------------------------------------------------------------- 9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 1,061,792 -------------------------------------------------------------------------------- 10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [_] -------------------------------------------------------------------------------- 11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 2.1% -------------------------------------------------------------------------------- 12. TYPE OF REPORTING PERSON* Individual (IN) -------------------------------------------------------------------------------- *SEE INSTRUCTIONS BEFORE FILLING OUT! CUSIP NO. G04074103 13G Page 3 of 5 Pages Item 1(a). Name of Issuer: Apex Silver Mines Limited Item 1(b). Address of Issuer's Principal Executive Offices: Walker House, Mary Street, George Town, Grand Cayman, Cayman Islands, British West Indies Item 2(a). Name of Person Filing: Thomas Scott Kaplan Item 2(b). Address of Principal Business Office, or, if None, Residence: 154 West 18th Street, New York, New York 10011 Item 2(c). Citizenship: United States Item 2(d). Title of Class of Securities: Ordinary Shares, $0.01 Par Value Item 2(e). CUSIP NUMBER: G04074103 Item 3. If this statement is filed pursuant to Rule 13d-1(b), or 13d-2(b), check whether the person Filing is a: (a) |_| Broker or dealer registered under Section 15 of the Act. (b) |_| Bank as defined in Section 3(a)(6) of the Act. (c) |_| Insurance Company as defined in Section 3(a)(19) of the Act. (d) |_| Investment Company registered under Section 8 of the Investment Company Act. (e) |_| Investment Adviser registered under Section 203 of the Investment Advisers Act of 1940. (f) |_| Employee Benefit Plan, Pension Fund which is subject to the provisions of the Employee Retirement Income Security Act of 1974 or Endowment Fund; see 13d-1(b)(1)(ii)(F). (g) |_| Parent Holding Company, in accordance with Rule 13d-1(b)(ii)(G); see Item 7. (h) |_| Group, in accordance with Rule 13d-1(b)(1)(ii)(H). CUSIP NO. G04074103 13G Page 4 of 5 Pages 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: 1,061,792 (see Exhibit A) (b) Percent of class: 2.1% (c) Number of shares as to which such person has: (i) Sole power to vote or to direct the vote 1,061,792 (ii) Shared power to vote or to direct the vote 0 (iii) Sole power to dispose or to direct the disposition of 1,061,792 (iv) Shared power to dispose or to direct the disposition of 0 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 person has ceased to be the Beneficial owner of more than five percent of the class of securities, check the following [ X ]. Item 6. Ownership of More than Five Percent on Behalf of Another Person. See Exhibit A. Item 7. Identification and Classification of the Subsidiary Which Acquired the Security Reported on by the Parent Holding Company. Not applicable. Item 8. Identification and Classification of members of the Group. Not applicable. Item 9. Notice of Dissolution of Group. Not applicable. CUSIP NO. G04074103 13G Page 5 of 5 Pages Item 10. Certification. Not applicable. SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true and correct. February 13, 2006 ------------------------------ (Date) /s/ Thomas Scott Kaplan ------------------------------ (Signature) Thomas Scott Kaplan ------------------------------ (Name/Title) Exhibit A to Schedule 13G As of February 13, 2006, the Reporting Person beneficially owned 1,061,792 Ordinary Shares (the "Shares") of the Issuer, which includes 189,449 Shares owned directly by the Reporting Person and 872,343 Shares that the Reporting Person has the right to acquire upon the exercise of options within 60 days of the date hereof. Based upon 50,464,890 Shares of the Issuer outstanding as of January 11, 2006, as reported in the Company's Form 424b5 filed with the Securities and Exchange Commission on January 17, 2006, the Shares beneficially owned by the Reporting Person constitute approximately 2.1% of the total Shares outstanding.