XML 95 R46.htm IDEA: XBRL DOCUMENT
v3.20.1

INCOME AND MINING TAXES (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
INCOME AND MINING TAXES. |
Schedule of deferred income tax recovery (expense) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
United States | ​ | $ | 2,420 | ​ | $ | 2,185 | ​ | $ | 10,349
Foreign | ​ | ​ | 1,424 | ​ | ​ | 585 | ​ | ​ | 5,020
Deferred tax benefit | ​ | $ | 3,844 | ​ | $ | 2,770 | ​ | $ | 15,369
Schedule of net income (loss) before tax | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019 |  | 2018 | ​ | 2017
United States | ​ | $ | (22,319) | ​ | $ | (27,001) | ​ | $ | (19,913)
Foreign | ​ | ​ | (41,272) | ​ | ​ | (20,639) | ​ | ​ | (6,090)
Loss before income and mining taxes | ​ | $ | (63,591) | ​ | $ | (47,640) | ​ | $ | (26,003)
Schedule of reconciliation of the tax provision at statutory U.S. Federal and State income tax rates to the actual tax provision recorded in the financial statement | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected tax recovery at |  | 2019 |  | 2018 |  | 2017
Loss before income and mining taxes | ​ | $ | (63,591) | ​ | $ | (47,640) | ​ | $ | (26,003)
Statutory tax rate | ​ | ​ | 21% | ​ | ​ | 21% | ​ | ​ | 35%
US Federal and State tax expense at statutory rate | ​ | ​ | (13,354) | ​ | ​ | (10,004) | ​ | ​ | (9,101)
Reconciling items: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity pickup in MSC | ​ |  | 2,626 | ​ |  | 2,966 | ​ |  | (16)
Deferred foreign income inclusion | ​ |  | 598 | ​ |  | 5,963 | ​ |  | 21,002
Realized flow-through expenditures | ​ | ​ | 3,150 | ​ | ​ | 2,100 | ​ | ​ | —
Realized flow-through premium | ​ | ​ | (2,954) | ​ | ​ | (1,675) | ​ | ​ | —
Foreign tax credits | ​ | ​ | — | ​ | ​ | — | ​ |  | (16,628)
Tax rate changes | ​ | ​ | 976 | ​ | ​ | — | ​ |  | 28,048
Adjustment for foreign tax rates | ​ |  | (200) | ​ |  | 40 | ​ |  | 115
Other permanent differences | ​ |  | 8,540 | ​ |  | 4,419 | ​ |  | (1,761)
Unrealized foreign exchange rate (loss)/gain | ​ |  | (1,095) | ​ |  | (6,935) | ​ |  | 2,469
NOL expires and revisions | ​ |  | 810 | ​ |  | (120) | ​ |  | (2,806)
Valuation allowance | ​ |  | (2,941) | ​ |  | 476 | ​ |  | (36,691)
Income and mining tax recovery | ​ | $ | (3,844) | ​ | $ | (2,770) | ​ | $ | (15,369)
Schedule of tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |
Deferred tax assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net operating loss carryforward | ​ | $ | 57,667 | ​ | $ | 55,515 | ​
Mineral Properties | ​ |  | 60,299 | ​ |  | 62,345 | ​
Other temporary differences | ​ |  | 14,356 | ​ |  | 15,198 | ​
Total gross deferred tax assets | ​ |  | 132,322 | ​ |  | 133,058 | ​
Less: valuation allowance | ​ |  | (121,212) | ​ |  | (124,153) | ​
Net deferred tax assets | ​ | $ | 11,110 | ​ | $ | 8,905 | ​
Deferred tax liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Acquired mineral property interests | ​ | ​ | (16,024) | ​ | ​ | (15,331) | ​
Total deferred tax liabilities | ​ | $ | (16,024) | ​ | $ | (15,331) | ​
Deferred income and mining tax liability | ​ | $ | (4,914) | ​ | $ | (6,426) | ​
Summary of changes in valuation allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
For the year ended December 31, |  | Balance at beginning of period |  | Additions(a) |  | Deductions(b) |  | Balance at end of period
2019 | ​ | $ | 124,153 | ​ | $ | 2,104 | ​ | $ | (5,045) | ​ | $ | 121,212
2018 | ​ | ​ | 123,648 | ​ | ​ | 12,232 | ​ | ​ | (11,727) | ​ | ​ | 124,153
2017 | ​ | ​ | 111,621 | ​ | ​ | 51,220 | ​ | ​ | (39,193) | ​ | ​ | 123,648
(a) | The additions to valuation allowance mainly results from the Company and its subsidiaries incurring losses and exploration expenses for tax purposes which do not meet the more-likely-than-not criterion for recognition of deferred tax assets.
(b) | The reductions to valuation allowance mainly results from release of valuation allowance, expiration of the Company’s tax attributes, foreign exchange reductions of tax attributes in Canada, Mexico and Argentina and inflationary adjustments to tax attributes in Argentina.
Summary of company's non operating losses that can be applied against future taxable profit | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Country |  | Type of Loss |  | Amount |  | Expiry Period
United States(a) | ​ | Net-operating losses | ​ | $ | 129,409 | ​ | 2020-2039
Mexico | ​ | Net-operating losses | ​ | ​ | 34,876 | ​ | 2020-2029
Canada(a) | ​ | Net-operating losses | ​ | ​ | 36,692 | ​ | 2020-2039
Argentina(a) | ​ | Net-operating losses | ​ | ​ | 41,922 | ​ | 2020-2024
(a) | The losses in the United States, Canada, and Argentina are part of multiple consolidating groups, and therefore, may be restricted in use to specific projects.
​

X
- Definition Tabular disclosure of pertinent information, such as tax authority, amounts, and expiration dates, of non operating loss carryforwards, including an assessment of the likelihood of utilization. + References No definition available. + Details
Name: | mux_SummaryOfNonOperatingLossCarryforwardsTableTextBlock
Namespace Prefix: | mux_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
Name: | us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_SummaryOfValuationAllowanceTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration