XML 113 R82.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Segmented and geographic information, and major customers (Major Customers) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Major Customer One [Member] |  |
Disclosure of major customers [line items] |  |
Percentage of revenue | 60.00% | 59.00%
Major Customer Two [Member] |  |
Disclosure of major customers [line items] |  |
Percentage of revenue | 40.00% | 31.00%
Major Customer Three [Member] |  |
Disclosure of major customers [line items] |  |
Percentage of revenue |  | 9.00%
Major Customer Four [Member] |  |
Disclosure of major customers [line items] |  |
Percentage of revenue |  | 1.00%

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

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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 2017-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2017-03-01&anchor=para_34&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_PercentageOfEntitysRevenue
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MajorCustomersAxis=usas_MajorCustomerOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_MajorCustomersAxis=usas_MajorCustomerTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=usas_MajorCustomerThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=usas_MajorCustomerFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |