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Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2017
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Summary of Expected Useful Lives	The expected useful lives are as follows: • Buildings and equipment (not used in production)             2 — 50 years • Plant and equipment (smelting operations)                         3 — 30 years

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The tabular disclosure of property plant and equipment estimated useful life.

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Text block1 [abstract]

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