|   |   |                                                                                 |
|--------|--------|--------------------------------------------------------------------------------------|
| o      |   | REGISTRATION STATEMENT PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 |

|   |   |                                                                                    |
|--------|--------|-----------------------------------------------------------------------------------------|
| þ |   | ANNUAL REPORT PURSUANT TO SECTION 13(a) OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

| For the fiscal year ended December 31, 2010  |  Commission file number: 1-32135 |
|--------------------------------------------------------|---------------------------------------|

|                                                              |   |                                                     |   |                                 |
|-------------------------------------------------------------------|--------|----------------------------------------------------------|--------|--------------------------------------|
| Canada                                                            |   | 1040                                                     |   | Not Applicable                       |
| (Province or other jurisdiction of incorporation or organization) |   | (Primary Standard Industrial Classification Code Number) |   | (I.R.S. Employer Identification No.) |
|                                                              |   |                                                     |   |                                 |

| Title of Each Class:        |   | Name of Each Exchange On Which Registered: |
|-----------------------------|--------|--------------------------------------------|
| Common Shares, no par value |   | NYSE Amex LLC; Toronto Stock Exchange      |

| þ     Annual Information Form |   | þ     Audited Annual Financial Statements |
|-------------------------------------------------------------|--------|-------------------------------------------------------------------------|

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| 99.1**        |   | Annual Information Form of the Company for the year ended December 31, 2010                                                                                                           |
|---------------|--------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|          |   |                                                                                                                                                                                       |
| 99.2*         |   | Management’s Discussion and Analysis of Financial Condition and Results of Operations for the year ended December 31, 2010                                                      |
|          |   |                                                                                                                                                                                       |
| 99.3*         |   | Audited Consolidated Financial Statements of the Company for the year ended December 31, 2010                                                                                         |
|          |   |                                                                                                                                                                                       |
| 99.4*         |   | Related Supplementary note entitled “Reconciliation with United States Generally Accepted Accounting Principles- Item 18”                                                      |
|          |   |                                                                                                                                                                                       |
| 99.5*         |   | Reports of KPMG LLP, independent registered public accounting firm for Seabridge Gold Inc. on the audited consolidated financial statements and internal control over financial reporting. |
|          |   |                                                                                                                                                                                       |
| 99.6**        |   | Certifications of Chief Executive Officer and Chief Financial Officer pursuant to Rule 13(a)-14(a) or 15(d)-14 of the Securities Exchange Act of 1934                                 |
|          |   |                                                                                                                                                                                       |
| 99.7**        |   | Certifications of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002   |
|          |   |                                                                                                                                                                                       |
| 99.8*         |   | Consent of KPMG LLP, Independent Registered Public Accounting Firm                                                                                                                         |
|          |   |                                                                                                                                                                                       |
| 99.9**        |   | Consents of EBA Engineering Consultants Ltd. and Eric Fier and Kevin Jones.                                                                                                                |
|          |   |                                                                                                                                                                                       |
| 99.10*        |   | Consent of Resource Modeling Inc. and Michael Lechner.                                                                                                                                     |
|          |   |                                                                                                                                                                                       |
| 99.11**       |   | Consents of Wardrop, A Tetra Tech Company, Frank Grills, John Huang and Ken Deter.                                                                                                         |
|          |   |                                                                                                                                                                                       |
| 99.12 *       |   | Consent of Moose Mountain Technical Services and J. H. Gray .                                                                                                                              |
|          |   |                                                                                                                                                                                       |
| 99.13 *       |   | Consent of W.N. Brazier Associates Inc. and W.N. Brazier.                                                                                                                                  |
|          |   |                                                                                                                                                                                       |
| 99.14 *       |   | Consent of Rescan Environmental Services Ltd. and Greg McKillop.                                                                                                                           |
|          |   |                                                                                                                                                                                       |
| 99.15 *       |   | Consent of Bosche Ventures Ltd. and Harold Bosche.                                                                                                                                         |
|          |   |                                                                                                                                                                                       |
| 99.16*        |   | Consent of Klohn Crippen Berger Ltd. and Graham Parkinson.                                                                                                                                 |
|          |   |                                                                                                                                                                                       |
| 99.17**       |   | Consent of McElhanney Consulting Services Ltd. and Robert Parolin.                                                                                                                         |
|          |   |                                                                                                                                                                                       |
| 99.18*        |   | Consent of BGC Engineering Inc. and Warren Newcomen.                                                                                                                                       |
|          |   |                                                                                                                                                                                       |
| 99.19*        |   | Consent of TJS Mining-Met Services Inc. and T.J. Smolik.                                                                                                                                   |
|  99.20** |   |  Consent of Snowden Mining Consultants Inc.                                                                                                                                           |
|          |   |                                                                                                                                                                                       |
| 99.21*        |   | Consent of Allnorth Consultants Ltd. and Darby Kreitz                                                                                                                                      |
|          |   |                                                                                                                                                                                       |
| 99.22*        |   | Consent of Thyssen Mining Construction of Canada Ltd. and Adrian Bodolan                                                                                                                   |
|          |   |                                                                                                                                                                                       |

| *  | Previously filed. |
|---------|-------------------|

| **  | Filed herewith. |
|----------|-----------------|

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|   | Seabridge Gold Inc. |                                         |
|--------|---------------------|----------------------------------------------|
|   |                |                                         |   |
|   | By:                 | /s/ Rudi P. Fronk                       |   |
|   |                | Name: Rudi P. Fronk                          |   |
|   |                | Title: President and Chief Executive Officer |   |
|   |                |                                         |   |