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OPERATING SEGMENTS - Revenue by Product (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Gold
Disclosure of products and services [line items]
Revenue (as a percent)	87.00%	80.00%
Silver
Disclosure of products and services [line items]
Revenue (as a percent)	12.00%	20.00%
Zinc
Disclosure of products and services [line items]
Revenue (as a percent)	1.00%	0.00%
Lead
Disclosure of products and services [line items]
Revenue (as a percent)	0.00%	0.00%
Customer One
Disclosure of products and services [line items]
Revenue (as a percent)	51.00%	7.00%

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.

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- 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 2018-01-01
-Paragraph 34
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_34&doctype=Standard
-URIDate 2018-03-16

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