14. Abandonment and Site Restoration liabilities
The summary of changes in abandonment and site restoration liabilities during the years ended December 31 are as follows:
|In thousands of US dollar||2012||2011|
|Abandonment and site restoration liability as at January 1,||8,713||4,543|
|Unwinding of discount (Note 22)||847||706|
|Change in estimates||(239)||2,512|
|Abandonment and site restoration liability as at December 31||11,064||8,713|
The long-term inflation and discount rates used to determine the abandonment and site restoration liabilities at December 31, 2012 were 7% and 10%, respectively (2011: 7% and 10%).