Property, plant and equipment and intangible assets (Tables)

12 Months Ended

Dec. 31, 2011

Property, plant and equipment and intangible assets

Schedule of property, plant and equipment and intangible assets

	As of December 31, 2011				As of December 31, 2010
	Cost	Accumulated Depreciation		Net	Cost	Accumulated Depreciation		Net
Land	695	—		695	356	—		356
Buildings	7,912	(1,890	)	6,022	6,087	(1,110	)	4,977
Installations	14,886	(3,708	)	11,178	14,904	(4,231	)	10,673
Equipment	12,549	(4,243	)	8,306	10,948	(3,637	)	7,311
Railroads	6,575	(1,930	)	4,645	7,337	(2,357	)	4,980
Mine development costs	26,955	(5,180	)	21,775	28,010	(4,071	)	23,939
Others	14,556	(4,126	)	10,430	12,088	(2,987	)	9,101
	84,128	(21,077	)	63,051	79,730	(18,393	)	61,337
Intangible assets	1,201	(67	)	1,134	1,316	(42	)	1,274
Construction in progress	25,845	—		25,845	21,759	—		21,759
Total	111,174	(21,144	)	90,030	102,805	(18,435	)	84,370