ASSET RETIREMENT OBLIGATION:

12 Months Ended

Dec. 31, 2012

ASSET RETIREMENT OBLIGATION:

ASSET RETIREMENT OBLIGATION:

NOTE 9-ASSET RETIREMENT OBLIGATION:

The Company maintains an estimated asset retirement obligation for its mining properties in Peru, as required by the Peruvian Mine Closure Law.  In accordance with the requirements of this law, the Company’s closure plans were approved by MINEM.  As part of the closure plans, commencing in January 2010 and, as amended in 2012, the Company is required to provide annual guarantees over the estimated life of the mines, based on a present value approach, and to furnish the funds for the asset retirement obligation.  This law requires a first review after three years and then successive reviews every five years.  Currently and for the near-term future, the Company has pledged the value of its Lima office complex as support for this obligation.  The accepted value of the Lima office building, for this purpose, is $17 million.  Through January 2013, the Company has provided guarantees of $10.5 million.  The closure cost recognized for this liability includes the cost, as outlined in its closure plans, of dismantling the Toquepala and Cuajone concentrators, the smelter and refinery in Ilo, and the shops and auxiliary facilities at the three units.  In 2010, the closure plan for the new Ilo marine trestle was added to the asset retirement obligation.  In the last quarter of 2012, the Company submitted updates to the closure plans for Toquepala, Cuajone and Ilo according with the requirement of the Mine Closure Law. As a result of these revised plans, the Company has adjusted its asset retirement obligation as shown in the table below.

In 2012, the Company decided to recognize an estimated asset retirement obligation for its mining properties in Mexico as part of its environmental commitment.  Even though, there is currently no enacted law, statute, ordinance, or written or oral contract requiring the Company to carry out mine closure and environmental remediation activities, the Company considered that a constructive obligation presently exists based on, among other things, the remediation experience caused by the closure of the San Luis Potosi smelter in 2010.  Consequentely, according to ASC- 410-20 on December 31, 2012 the Company recorded an asset retirement obligation of $25.1 million and increased net property by $20.3 million. The overall cost recognized for mining closure includes the estimated costs of dismantling concentrators, smelter and refinery plants, shops and other facilities.

The following table summarizes the asset retirement obligation activity for the two years ended December 31, 2012 and 2011 (in millions):

	2012			2011
Balance as of January 1	$	62.0		$	59.1
Changes in estimates	27.4			—
Additions	25.1			—
Closure payments	(0.3		)	(0.5		)
Accretion expense	4.0			3.4
Balance as of December 31,	$	118.2		$	62.0