XML 109 R78.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Financial risk management (Schedule of Currency Risks) (Details) - Currency risk [Member] MXN in Thousands, CAD in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CAD CAD / $ MXN / $ | Dec. 31, 2017 MXN | Dec. 31, 2017 MXN CAD / $ MXN / $
Canadian Dollar [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Approximate impact of exchange rate fluctuations on net loss | CAD | CAD 732 |  |
Approximate impact of exchange rate fluctuations on other comprehensive loss | CAD | CAD (93) |  |
Foreign exchange rates | CAD / $ | 1.25 |  | 1.25
Mexican Peso [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Approximate impact of exchange rate fluctuations on net loss | MXN |  | MXN 850 |
Approximate impact of exchange rate fluctuations on other comprehensive loss | MXN |  | MXN 110 |
Foreign exchange rates | MXN / $ | 19.74 |  | 19.74
Cash and Cash Equivalents [Member] | Canadian Dollar [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income | CAD | CAD 1,436 |  |
Cash and Cash Equivalents [Member] | Mexican Peso [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income | MXN |  |  | MXN 1,681
Trade and other receivables [Member] | Canadian Dollar [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income | CAD | 19 |  |
Trade and other receivables [Member] | Mexican Peso [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income | MXN |  |  | 2,814
Trade and Other Payables [Member] | Canadian Dollar [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income | CAD | CAD 1,831 |  |
Trade and Other Payables [Member] | Mexican Peso [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Risk from currency fluctuations yet to be recognized in net earnings or other comprehensive income | MXN |  |  | MXN 4,385

X
- Definition The aggregate difference between the fair value at initial recognition and the transaction price for financial instruments that is yet to be recognised in profit or loss. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_28_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_AggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ClosingForeignExchangeRate
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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
Name: | ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in profit or loss resulting from amounts recognised in profit or loss. [Refer: Aggregate difference between fair value at initial recognition and transaction price yet to be recognised in profit or loss; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph IG14 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_IG14&doctype=Implementation%20Guidance -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_28_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_IncreaseDecreaseThroughAmountsRecognisedInProfitOrLossAggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in the aggregate difference between the fair value at initial recognition and the transaction price of financial instruments yet to be recognised in other comprehensive income (loss) resulting from amounts recognised in other comprehensive income (loss). + References No definition available. + Details
Name: | usas_IncreaseDecreaseThroughAmountsRecognisedInOtherComprehensiveLossAggregateDifferenceBetweenFairValueAtInitialRecognitionAndAmountDeterminedUsingValuationTechniqueYetToBeRecognised
Namespace Prefix: | usas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | usas_ForeignCurrencyAxis=currency_CAD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | usas_ForeignCurrencyAxis=currency_MXN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=usas_CashAndCashEquivalentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=usas_TradeAndOtherPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |