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## Contractual and Other Obligations 

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Notes: 

(1) We lease road and port facilities from the Alaska Industrial Development and Export Authority through which we ship metal concentrates produced at the Red Dog mine. Minimum lease payments are US$18 million per annum and are subject to deferral and abatement for force majeure events. 

(2) The majority of our minimum purchase obligations are subject to continuing operations and force majeure provisions. 

(3) As at December 31, 2012, the company had a net pension deficit of $255 million based on actuarial estimates prepared on a going concern basis. The amount of minimum funding for 2013 in respect of defined benefit pension plans is $143 million. The timing and amount of additional funding after 2013 is dependent upon future returns on plan assets, discount rates and other actuarial assumptions. 

(4) We had a discounted, actuarially determined liability of $499 million in respect of other non-pension post-retirement benefits as at December 31, 2012. Amounts shown are estimated expenditures in the indicated years. 

(5) We accrue environmental and reclamation obligations over the life of our mining operations and amounts shown are estimated expenditures in the indicated years at fair value, assuming credit-adjusted risk-free discount rates between 4.95% and 5.95% and an inflation factor of 2.00%. 

(6) Other long-term liabilities include amounts for post-closure, environmental costs and other items. 

(7) In November 2005, we acquired a 15% interest in the Fort Hills Energy Limited Partnership, which is developing the Fort Hills oil sands project in Alberta, Canada. In September 2007, we acquired an additional 5% interest, bringing our total interest to 20%. To earn our additional 5% interest, we are required to contribute 27.5% of $5 billion of project expenditures after project spending reaches $2.5 billion. We are presently funding at this level. 

Thereafter, we are responsible for our 20% share of development costs. As a decision to proceed with the project has not yet been made, no additional commitments beyond our earn-in commitment are presently shown. In the event of project abandonment, as agreed to by the partners, monies held by the Fort Hills Energy Limited Partnership would be returned to the partners in the respective equity ratios after having fulfilled all funding obligations to an aggregate of $7.5 billion. 

