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Segmented and geographic information, and major customers (Statements of Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Disclosure of operating segments [line items] |  |  |  |  |
Revenue | $ 11,734 | $ 9,814 | $ 49,468 | $ 42,234 |
Cost of sales | (12,809) | (7,694) | (37,943) | (30,357) |
Depletion and amortization | (2,443) | (1,715) | (7,044) | (5,795) |
Care, maintenance and restructuring costs | (129) | (136) | (990) | (589) |
Corporate general and administrative expenses | (1,659) | (1,515) | (5,227) | (4,777) |
Exploration costs | (539) | (1,307) | (2,528) | (1,915) |
Accretion on decommissioning provision | (48) | (45) | (144) | (134) |
Interest and financing income (expense) | (234) | 19 | (746) | (594) |
Foreign exchange gain (loss) | (87) | (181) | (271) | (72) |
Gain on disposal of assets | 15 |  | 870 |  |
Gain on forward contract | 254 |  | 857 |  |
Gain on investment in equity instruments |  | (3) |  | 8 |
Write-down of equipment | (65) |  | (65) |  | $ (200)
Contingency on value added taxes |  |  | (125) |  |
Income (loss) before income taxes | (6,010) | (2,763) | (3,888) | (1,991) |
Income tax recovery (expense) | 219 | (9) | 10 | (116) |
Net Income (loss) for the year | (5,791) | (2,772) | (3,878) | (2,107) |
Mexican Operations [Member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Revenue | 6,303 | 2,650 | 28,986 | 16,975 |
Cost of sales | (6,085) | (343) | (17,278) | (7,576) |
Depletion and amortization | (1,587) | (707) | (4,533) | (2,862) |
Care, maintenance and restructuring costs | (8) |  | (30) | (60) |
Corporate general and administrative expenses |  |  |  |  |
Exploration costs | (462) | (1,180) | (2,362) | (1,615) |
Accretion on decommissioning provision | (37) | (35) | (110) | (103) |
Interest and financing income (expense) | (234) | 21 | (746) | 94 |
Foreign exchange gain (loss) | (88) | (187) | (281) | (161) |
Gain on disposal of assets | 15 |  | 870 |  |
Gain on forward contract | 256 |  | 319 |  |
Gain on investment in equity instruments |  |  |  |  |
Write-down of equipment |  |  |  |  |
Contingency on value added taxes |  |  | (125) |  |
Income (loss) before income taxes | (1,927) | 219 | 4,710 | 4,692 |
Income tax recovery (expense) | 219 | (9) | 10 | (116) |
Net Income (loss) for the year | (1,708) | 210 | 4,720 | 4,576 |
U.S. Operations [Member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Revenue | 5,431 | 7,164 | 20,482 | 25,259 |
Cost of sales | (6,724) | (7,531) | (20,665) | (22,781) |
Depletion and amortization | (855) | (1,005) | (2,505) | (2,925) |
Care, maintenance and restructuring costs | (121) | (136) | (960) | (362) |
Corporate general and administrative expenses |  |  |  |  |
Exploration costs | (77) | (127) | (166) | (300) |
Accretion on decommissioning provision | (11) | (10) | (34) | (31) |
Interest and financing income (expense) |  |  |  |  |
Foreign exchange gain (loss) |  |  |  |  |
Gain on disposal of assets |  |  |  |  |
Gain on forward contract |  |  | 165 |  |
Gain on investment in equity instruments |  |  |  |  |
Write-down of equipment | (65) |  | (65) |  |
Contingency on value added taxes |  |  |  |  |
Income (loss) before income taxes | (2,422) | (1,465) | (3,748) | (1,140) |
Income tax recovery (expense) |  |  |  |  |
Net Income (loss) for the year | (2,422) | (1,465) | (3,748) | (1,140) |
Corporate and Other [Member] |  |  |  |  |
Disclosure of operating segments [line items] |  |  |  |  |
Revenue |  |  |  |  |
Cost of sales |  |  |  |  |
Depletion and amortization | (1) | (3) | (6) | (8) |
Care, maintenance and restructuring costs |  |  |  | (167) |
Corporate general and administrative expenses | (1,659) | (1,515) | (5,227) | (4,777) |
Exploration costs |  |  |  |  |
Accretion on decommissioning provision |  |  |  |  |
Interest and financing income (expense) |  | (2) |  | (668) |
Foreign exchange gain (loss) | 1 | 6 | 10 | 89 |
Gain on disposal of assets |  |  |  |  |
Gain on forward contract | (2) |  | 373 |  |
Gain on investment in equity instruments |  | (3) |  | 8 |
Write-down of equipment |  |  |  |  |
Contingency on value added taxes |  |  |  |  |
Income (loss) before income taxes | (1,661) | (1,517) | (4,850) | (5,543) |
Income tax recovery (expense) |  |  |  |  |
Net Income (loss) for the year | $ (1,661) | $ (1,517) | $ (4,850) | $ (5,543) |

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- Definition The amount of costs relating to expenses directly or indirectly attributed to the goods or services sold, which may include, but are not limited to, costs previously included in the measurement of inventory that has now been sold, unallocated production overheads and abnormal amounts of production costs of inventories. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_103&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_e&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_104&doctype=Standard -URIDate 2018-03-16 + Details
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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 -Name IFRS -Number 6 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=6&date=2018-03-01&anchor=para_24_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2018-01-01 -Paragraph 35 -Subparagraph b -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2018-03-01&anchor=para_35_b_viii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_h&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 79 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_79&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 82 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_d&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_g&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The profit (loss) before tax expense or income. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_103&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2018-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2018-03-01&anchor=para_33_b_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Contingency on value added taxes. + References No definition available. + Details
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Namespace Prefix: | usas_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Interest and financing expenses incurred during the period. + References No definition available. + Details
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Namespace Prefix: | usas_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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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: |

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