ASSET RETIREMENT OBLIGATION:

9 Months Ended

Sep. 30, 2016

NOTE 7 - 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 the Peruvian Ministry of Energy and Mines (“MINEM”). As part of the closure plans, 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 review of closing plans 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 $27.8 million. Through September 2016, the Company has provided guarantees of $21.7 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 Company announced to the Mexican federal environmental authorities its closure plans for the copper smelter plant at San Luis Potosi. In order to transform an environmental liability into an asset, the Company initiated a program for plant demolition and soil remediation with a budget of $66.2 million, of which the Company has spent $65.7 million through September 30, 2016. Plant demolition and construction of a confinement area at the south of the property were completed in 2012. In accordance with remediation goals previously approved by environmental authorities, soil remediation and on-site encapsulation on a second confinement area of impacted soils has been completed. Confirmation sampling was successfully completed. On September 2, 2016, the environmental authorities approved the conclusion of the remediation effort. A decision will be made on whether to sell or develop the property.

The overall cost recognized for mining closure in Mexico 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 nine months ended September 30, 2016 and 2015 ($ in millions):

	2016			2015
Balance as of January 1	$	190.9		$	116.1
Changes in estimates	—			—
Payments	(1.7		)	(15.3		)
Accretion expense	21.2			13.1

Balance as of September 30,	$	210.4		$	113.9