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Impairment of Non-Current Assetes - Key Assumptions and Sensitivity Analysis (Details)	Dec. 31, 2019 $ / Ounce
Bottom of range [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Discount rate applied to cash flow projections	4.00%
Top of range [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Discount rate applied to cash flow projections	12.30%
Silver, Ounces | Weighted average [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Metal prices used to calculate recoverable amounts	17.94
Gold, Ounces | Weighted average [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Metal prices used to calculate recoverable amounts	1,474
Weighted average cost of capital, measurement input [member]
Disclosure of impairment loss and reversal of impairment loss [line items]
Significant unobservable inputs, assets	0.037

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- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

+ References

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

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The value of significant unobservable input used in the measurement of the fair value of assets.

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