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Significant accounting policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Significant Accounting Policies Details Narrative |
Schedule of estimated useful lives | Depreciation of assets is determined using the straight-line method over the estimated useful lives of such assets as follows:
| Years
Buildings and other constructions: |
Administrative facilities | Between 35 and 48
Main production structures | Between 30 and 49
Minor production structures | Between 20 and 35
Machinery and equipment: |
Mills and horizontal furnaces | Between 42 and 49
Vertical furnaces, crushers and grinders | Between 23 and 36
Electricity facilities and other minors | Between 12 and 35
Furniture and fixtures | 10
Transportation units: |
Heavy units | Between 11 and 21
Light units | Between 8 and 11
Computer equipment | 4
Tools | Between 5 and 10

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- Definition The disclosure of detailed information about property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73&doctype=Standard -URIDate 2017-03-09 + Details
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