(e) Decommissioning liabilities
An obligation to incur decommissioning and site rehabilitation costs occurs when environmental disturbance is caused by exploration, evaluation, development or ongoing production.
Decommissioning and site rehabilitation costs arising from the installation of plant and other site preparation work, discounted to their net present value, are provided when the obligation to incur such costs arises and are capitalized into the cost of the related asset. These costs are charged against operations through depreciation of the asset and unwinding of the discount on the provision.
Depreciation is included in operating costs while the unwinding of the discount is included as a financing cost. Changes in the measurement of a liability relating to the decommissioning or site rehabilitation of plant and other site preparation work are added to, or deducted from, the cost of the related asset.
The costs for the restoration of site damage, which arises during production, are provided at their net present values and charged against operations as extraction progresses.
Changes in the measurement of a liability, which arise during production, are charged against operating profit. The discount rate used to measure the net present value of the obligations is the pre-tax rate that reflects the current market assessment of the time value of money and the risks specific to the obligation. To date the Company does not have any decommissioning liabilities.