| 1.   | I                have reviewed this annual report                on Form 40-F of Rubicon Minerals                Corporation; |
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| 2.   | Based                on my knowledge, this report                does not contain any untrue statement of a material fact or omit                to state                a material fact necessary to make the statements made, in light of                the                circumstances under which such statements were made, not misleading                with                respect to the period covered by this                report; |
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| 3.   | Based                on my knowledge, the                financial statements, and other financial information included in                this report,                fairly present in all                material respects the financial condition, results of operations                and cash                flows of the issuer as of, and for, the periods presented in this                report; |
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| 4.   | The                issuer’s other certifying                officer(s) and I are responsible for establishing and maintaining                disclosure controls and procedures (as defined in Exchange Act Rules                13a-15(e) and 15d-15(e)) and internal control over financial reporting                (as                defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the issuer                and                have: |
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| a)   | Designed                such disclosure controls                and procedures, or caused such disclosure controls and procedures                to be                designed under our supervision, to ensure that material information                relating to the issuer, including its consolidated subsidiaries,                is made                known to us by others within those entities, particularly during                the                period in which this report is being                prepared; |
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| b)   | Designed                such internal control                over financial reporting, or caused such internal control over financial                reporting to be designed under our supervision, to provide reasonable                assurance regarding the reliability of financial reporting and the                preparation of financial statements for external purposes in accordance                with generally accepted accounting                principles; |
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| c)   | Evaluated                the effectiveness of the                issuer’s disclosure controls and procedures and presented in this report                our conclusions about the effectiveness of the disclosure controls                and                procedures, as of the end of the period covered by this report based                on                such evaluation; and |
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| d)   | Disclosed                in this report any                change in the issuer’s internal control over financial reporting that                occurred during the period covered by the annual report that has                materially affected, or is reasonably likely to materially affect,                the                issuer’s internal control over financial reporting;                and |
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| 5.   | The                issuer’s other certifying                officer and I have disclosed, based on our most recent evaluation                of                internal control over financial reporting, to the issuer’s auditor and the                audit committee of the issuer’s board of directors (or persons performing                the equivalent functions): |
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| a)   | All                significant deficiencies and                material weaknesses in the design or operation of internal control                over                financial reporting which are reasonably likely to adversely affect                the                issuer’s ability to record, process, summarize and report financial                information; and |
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| b)   | Any                fraud, whether or not                material, that involves management or other employees who have a                significant role in the issuer’s internal control over financial                reporting. |
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|                                                          |   |      |   |  /s/“Robert                G.                Lewis”                                                                          |
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| Date:  March                31,                2008 |   |  By: |   | Rubicon                Minerals CorporationRobert                G.                LewisChief                Financial                Officer |