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Income taxes | 9 Months Ended
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Sep. 30, 2018
Income Taxes [abstract] |
Income taxes | 15. Income taxes Income tax expense is recognized based on management’s best estimate of the weighted average annual income tax rate expected for the full financial year. The estimated average annual rate used for the nine-month period ended September 30, 2018 was 26.5% and for the year ended December 31, 2017 was 26.5%. The Company’s net deferred tax liability relates to the Mexican mining royalty and arises principally from the following:
|  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
Property, plant and equipment |  | $ | 837 |  |  | $ | 900 |
Other |  |  | 25 |  |  |  | - |
Total deferred tax liabilities |  |  | 862 |  |  |  | 900 |
Alternative minimum tax credits |  |  | 626 |  |  |  | 626 |
Other |  |  | - |  |  |  | 28 |
Total deferred tax assets |  |  | 626 |  |  |  | 654 |
Net deferred tax liabilities |  | $ | 236 |  |  | $ | 246 |

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- Definition The entire disclosure for income taxes. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Section Disclosure -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=sect_Disclosure&doctype=Standard -URIDate 2018-03-16 + Details
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