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ROYALTY INTERESTS - Disclosure of detailed information about royalty interests (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Royalty Interests [Abstract] |  |
Royalty interest, beginning balance | $ 14,346 | $ 21,943
Additions | 560 |
Depletion | (802) | (1,732)
Impairment of royalty interest |  | (7,256)
Cumulative translation adjustments | (616) | 1,391
Royalty interest, ending balance | $ 13,488 | $ 14,346

X
- Definition CTA loss on royalty interest + References No definition available. + Details
Name: | emx_RoyalInterestCumulativeTranslationAdjustments
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 Represents the amount related to additions of royalty interests. + References No definition available. + Details
Name: | emx_RoyaltyInterestAdditions
Namespace Prefix: | emx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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