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Mineral Properties and Exploration and Evaluation Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Purchase of mining assets	$ 28,473	$ 36,788
Expense arising from exploration for and evaluation of mineral resources	2,411	723
Lindero Project [member]
Disclosure of detailed information about property, plant and equipment [line items]
Capitalized interest	$ 5,259	$ 1,125

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- 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 amount of expense arising from the search for mineral resources, including minerals, oil, natural gas and similar non-regenerative resources after the entity has obtained legal rights to explore in a specific area, as well as the determination of the technical feasibility and commercial viability of extracting the mineral resource.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset.

+ References

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

The cash outflow for the purchase of mining assets. [Refer: Mining assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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