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Disclosure of detailed information about royalty interest (Details) - CAD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement [Line Items] |  |  |
Royalty interest, beginning balance | $ 25,831,152 | $ 28,798,980 | $ 29,327,960
Acquisition |  | 145,000 |
Depletion | (2,282,276) | (2,163,221) | (1,716,848)
Impairment charge |  |  | (3,973,699)
Cumulative translation adjustments | (1,605,133) | (949,607) | 5,161,567
Royalty interest, ending balance | $ 21,943,743 | $ 25,831,152 | $ 28,798,980

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- Definition CTA loss on royalty interest + References No definition available. + Details
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Namespace Prefix: | emx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Royalty interest + References No definition available. + Details
Name: | emx_RoyaltyInterest
Namespace Prefix: | emx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Acquisition + References No definition available. + Details
Name: | emx_RoyaltyInterestAcquisition
Namespace Prefix: | emx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Depletion + References No definition available. + Details
Name: | emx_RoyaltyInterestDepletion
Namespace Prefix: | emx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Impairment charge + References No definition available. + Details
Name: | emx_RoyaltyInterestImpairmentCharge
Namespace Prefix: | emx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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