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OPERATING SEGMENTS - Revenue by Product (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Gold
Disclosure of products and services [line items]
Revenue (as a percent)	80.00%	65.00%
Silver
Disclosure of products and services [line items]
Revenue (as a percent)	20.00%	35.00%
Customer One
Disclosure of products and services [line items]
Revenue (as a percent)	7.00%	15.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of the entity's revenue. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 8
-IssueDate 2017-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard
-URIDate 2017-03-09

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- Details

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- Details

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X

- Details

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