XML 82 R51.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Pre-payment facility (Details) - USD ($) $ in Millions | Mar. 30, 2017 | Dec. 31, 2017
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Prepayment Facility [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Aggregate principal amount of debt |  | $ 15.0
Annual principal repayment due 2018 |  | 4.0
Annual principal repayment due 2019 |  | 5.5
Annual principal repayment due 2020 |  | $ 5.5
Promissory Note [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Aggregate principal amount of debt | $ 15.0 |
Term loan | 4 years |
Interest rate | 5.00% |

X
- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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Balance Type: | na
Period Type: | instant

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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. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + 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
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- Definition Annual principal repayment due year one. + References No definition available. + Details
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Namespace Prefix: | usas_
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Balance Type: | debit
Period Type: | instant

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- Definition Annual principal repayment due year three. + References No definition available. + Details
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Namespace Prefix: | usas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Annual principal repayment due year two. + References No definition available. + Details
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Namespace Prefix: | usas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Period for loan. + References No definition available. + Details
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Namespace Prefix: | usas_
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Balance Type: | na
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |