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ASSET RETIREMENT OBLIGATIONS (Narrative) (Details)	Dec. 31, 2016
Wuhu Feishang [Member]
DisclosureOfAssetRetirementObligationsLineItems [Line Items]
Inflation rate	2.53%
Discount rate	9.91%
Market risk premium rate	6.09%
Antay Pacha [Member]
DisclosureOfAssetRetirementObligationsLineItems [Line Items]
Inflation rate	4.80%
Discount rate	8.42%
Market risk premium rate	6.09%

X

- Definition

Market risk premium rate.

+ References

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- Definition

The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2017-01-01
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- Definition

The expected rate of inflation that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

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-URIDate 2017-03-09

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