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Finding and Development Costs ("F&D")

--------------------------------------------------------------------------------------------------------------------------------------------------------Total Proved Finding and Development Cost Including FDC, excluding Acquisitions, Dispositions, Revisions, and                                          Three Economic Factors ($ thousands,                                         year except per unit amounts)              2012       2011       2010      total----------------------------------------------------------------------------Capital expenditures excluding acquisitions and dispositions abandonment and furniture and fixtures (unaudited) (1)            84,316    124,981     59,139    268,436Net change from previously allocated future development capital                             52,099     12,685      4,782     69,566----------------------------------------------------------------------------Total capital including the net change in future capital           136,415    137,666     63,921    338,002----------------------------------------------------------------------------Reserve additions including acquisitions, dispositions and revisions (mboe)                     2,145      3,942      2,353      8,439All-in total proved finding and development costs (per boe)       $  63.61   $  34.92   $  27.17   $  40.05--------------------------------------------------------------------------------------------------------------------------------------------------------Note: (1) Excludes non-cash costs, including decommissioning liabilities.--------------------------------------------------------------------------------------------------------------------------------------------------------Total Proved Plus Probable Finding and Development Cost Including FDC, excluding Acquisitions, Dispositions, Revisions, and Economic Factors                                       Three ($ thousands, except per unit                                          year amounts)                              2012       2011       2010      total----------------------------------------------------------------------------Capital expenditures excluding acquisitions and dispositions,abandonment and furniture and fixtures (unaudited) (1)                     84,316    124,981     59,139    268,436Net change from previously allocated future development capital                             95,915     39,390      9,232    144,537----------------------------------------------------------------------------Total capital including the net change in future capital           180,230    164,371     68,371    412,972----------------------------------------------------------------------------Reserve additions including acquisitions, dispositions and revisions (mboe)                     4,339      6,480      3,654     14,472All-in total proved plus probable finding and development costs (per boe)       $  41.54   $  25.37   $  18.71   $  28.54--------------------------------------------------------------------------------------------------------------------------------------------------------Note: (1) Excludes non-cash costs, including decommissioning liabilities.

Total exploration and development costs incurred in the most recent financial year and the change during that year in estimated future development costs, generally will not reflect the total cost of reserve additions in that year.

Recycle Ratio

The recycle ratio is calculated as the annual netback per barrel divided by the NI 51-101 calculated finding and development costs (excluding acquisitions and dispositions, abandonment and furniture and fixtures).

--------------------------------------------------------------------------------------------------------------------------------------------------------Total Proved                    Consolidated          Canada         Tunisia----------------------------------------------------------------------------Operating netback before commodity price contracts ($/boe)(unaudited) (1)                23.31           11.86           81.8351-101 F&D costs ($/boe)(unaudited)                    39.27           47.87           38.17----------------------------------------------------------------------------Recycle ratio                           0.6x            0.2x            2.1x------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Total Proved Plus Probable      Consolidated          Canada         Tunisia----------------------------------------------------------------------------Operating netback before commodity price contracts ($/boe)(unaudited) (1)                23.31           11.86           81.8351-101 F&D costs ($/boe)(unaudited)                    40.19           96.22           36.20----------------------------------------------------------------------------Recycle ratio                           0.6x            0.1x            2.3x--------------------------------------------------------------------------------------------------------------------------------------------------------Note: (1) Operating netback is calculated by deducting royalties and net          production expenses from revenue.