COMMITMENTS AND CONTINGENCIES: (Tables)

12 Months Ended

Dec. 31, 2012

COMMITMENTS AND CONTINGENCIES:

Schedule of environmental capital expenditures

Environmental capital expenditures in years 2012, 2011 and 2010, were as follows (in millions):

	2012		2011		2010
Peruvian operations	$	3.4	$	2.5	$	6.4
Mexican operations	20.7		11.5		10.2
Total	$	24.1	$	14.0	$	16.6