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Reclamation and Mine Closure | 12 Months Ended
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Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract] |
RECLAMATION AND MINE CLOSURE | RECLAMATION AND MINE CLOSURE Reclamation and mine closure costs are based principally on legal and regulatory requirements. Management estimates costs associated with reclamation of mining properties as well as remediation costs for inactive properties. The Company uses assumptions about future costs, mineral prices, mineral processing recovery rates, production levels, capital costs and reclamation costs. Such assumptions are based on the Company’s current mining plan and the best available information for making such estimates. The sum of the expected costs by year is discounted, using the Company's credit-adjusted risk-free interest rate. On an ongoing basis, management evaluates its estimates and assumptions; however, future expenditures could differ from those based on such estimates and assumptions. Changes to the Company’s asset retirement obligations are as follows (in thousands):
| Years ended December 31,
| 2013 |  | 2012
Asset retirement obligation - Beginning | $ | 34,457 |  |  | $ | 32,714 |
Accretion | 3,442 |  |  | 2,911 |
Additions and changes in estimates | 20,236 |  |  | (1,073 | )
Settlements | (681 | ) |  | (95 | )
Asset retirement obligation - Ending | $ | 57,454 |  |  | $ | 34,457 |
During the year ended December 31, 2013, Rochester and Kensington submitted updated reclamation plans to state and federal agencies based on new regulations, mine plans, and cost estimates. As a result of the new reclamation plans, the Company increased asset retirement obligations by $20.2 million in 2013. The Company did not have a similar change to the reclamation plans in the year ended December 31, 2012. The Company has accrued $1.0 million and $0.9 million at December 31, 2013 and December 31, 2012, respectively, for reclamation liabilities related to former mining activities. These amounts are also included in Reclamation and mine closure in the Consolidated Balance Sheets.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 143 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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