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Disclosure of detailed information about reclamation bonds (Details) - CAD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Statement [Line Items] |  |
Reclamation bonds | $ 515,748 | $ 639,427
Australia [Member] |  |
Statement [Line Items] |  |
Reclamation bonds | 0 | 67,694
Sweden [Member] |  |
Statement [Line Items] |  |
Reclamation bonds | 12,625 | 8,043
Turkey [Member] |  |
Statement [Line Items] |  |
Reclamation bonds | 5,669 | 26,362
USA [Member] |  |
Statement [Line Items] |  |
Reclamation bonds | $ 497,454 | $ 537,328

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- Definition Reclamation bonds + References No definition available. + Details
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Namespace Prefix: | emx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Statement [Line Items] + References No definition available. + Details
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Namespace Prefix: | emx_
Data Type: | xbrli:stringItemType
Balance Type: | na
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
Name: | emx_ExplorationAndEvaluationAssetsByGeographyAxis=country_TR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | emx_ExplorationAndEvaluationAssetsByGeographyAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |