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EXPLORATION AND EVALUATION ASSETS (Narrative) (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended 13 Months Ended
May 04, 2015
USD ($)
Nov. 30, 2019
CAD ($)
$ / shares
shares
Aug. 31, 2019
CAD ($)
Aug. 31, 2019
USD ($)
May 31, 2019
USD ($)
Apr. 30, 2019
CAD ($)
oz
shares
Apr. 30, 2019
USD ($)
oz
$ / shares
shares
Feb. 28, 2019
shares
Feb. 19, 2019
CAD ($)
shares
Feb. 19, 2019
$ / shares
Nov. 30, 2018
CAD ($)
Sep. 24, 2018
USD ($)
shares
Apr. 30, 2018
CAD ($)
shares
Apr. 30, 2018
USD ($)
shares
Feb. 28, 2018
USD ($)
shares
Jul. 29, 2016
CAD ($)
Jul. 29, 2016
USD ($)
Jul. 17, 2012
shares
Sep. 24, 2009
CAD ($)
shares
Sep. 24, 2009
USD ($)
shares
Mar. 31, 2018
shares
Dec. 31, 2019
CAD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
CAD ($)
Ounce
$ / shares
Dec. 31, 2018
USD ($)
Ounce
Sep. 25, 2020
Feb. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Receivables                                           $ 981   $ 7,506            
Cash equivalents                                           68,994   86,175           $ 3,534
USA South 32 [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Annual proceeds for new acquisition funding                     $ 200                                      
Annual Proceeds To Generate New Prospects                     $ 800                                      
Option agreement, interest                     100.00%                                      
Option agreement, exploration expenditures required                     $ 5,000                                      
Net smelter return royalty                     2.00%                                      
Proceeds from option agreement                     $ 525                                      
Boreal Metals Corp. [Member] | Sweden and Norway [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Annual advance royalty                                           53           $ 40 $ 20  
Aes Madencilik As [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Receivables                                             $ 903            
Proceeds from purchase agreement                               $ 2,631 $ 2,000                          
BCE Inc [Member] | USA Mainspring, Arizona [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual option payment       $ 600                                                    
Annual advance royalty       $ 23,000                                                    
Production Royalty Percentage     1.00% 1.00%                                                    
Advanced royalty payments       $ 100                                                    
Additional Extension Payment For Each Year Extension       250                                                    
Amount delivered to title holder on exercise of option       $ 11,000                                                    
Right To Buy Back Half Royalty Percentage     1.00% 1.00%                                                    
Right To Buy Back Half Royalty       $ 10,000                                                    
Modum Project [Member] | Boreal Metals Corp. [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Number of equity interests in subsidiary acquired | shares                                         1,324,181                  
Equity interests of acquirer, value per share | $ / shares                                               $ 0.30            
Equity interests of acquirer                                               $ 397            
Guldgruvan Cobalt Project [Member] | Boreal Energy Metals Corporation [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Number of equity interests in subsidiary acquired | shares                             2,979,798                              
Percentage of equity interests acquired                             5.90%                              
Njuggtraskliden And Mjovattnet Projects [Member] | Boreal Energy Metals Corporation [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Number of equity interests in subsidiary acquired | shares                         2,020,202 2,020,202                                
Percentage of equity interests acquired                         4.00% 4.00%                                
Proceeds from reimbursement of amounts paid                           $ 37                                
Aggregate Interest                         9.90% 9.90%                                
Proceeds from issuing shares                         $ 3,000                                  
Rostvangen Property And Vakkerlien Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual option payment                                           $ 150                
Option agreement, interest               100.00%                                            
Number of shares acquired | shares               3,000,000                                            
Definitive sales agreement, description of net smelter royalty               9.9% interest in Playfair, a 3% NSR royalty on the projects, and advance royalty payments. Pursuant to the agreement, Playfair can earn a 100% interest in the project by the issuance of 3,000,000 common shares (received) to EMX and performance of certain work during the option period.                                            
Share Price Per Share | $ / shares                                           $ 0.05                
Gold Line Resources Agreement [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from purchase agreement           $ 127                                                
Proceeds from issuing shares           $ 260                                                
Number of shares acquired | shares           2,555,210 2,555,210                                              
Project ownership percentage acquired           9.90% 9.90%                                              
Definitive sales agreement, description of equity ownership continuing obligation           Upon closing, the agreement provides EMX with a 9.9% interest in GLR, a free carry of its 9.9% interest until GLR has raised $5,000 in equity; reimbursement of license fees totaling US$101 ($133 received), advance royalty payments, and a 3% royalty interest in the properties. Upon closing, the agreement provides EMX with a 9.9% interest in GLR, a free carry of its 9.9% interest until GLR has raised $5,000 in equity; reimbursement of license fees totaling US$101 ($133 received), advance royalty payments, and a 3% royalty interest in the properties.                                              
Definitive sales agreement, description of advanced annual royalty payments           3% royalty interest in the properties. Within six years of the closing date, GLR has the right to buy down up to 1% of the royalty owed to EMX (leaving EMX with a 2% NSR royalty) by paying EMX 2,500 ounces of gold, or the cash equivalent. 3% royalty interest in the properties. Within six years of the closing date, GLR has the right to buy down up to 1% of the royalty owed to EMX (leaving EMX with a 2% NSR royalty) by paying EMX 2,500 ounces of gold, or the cash equivalent.                                              
Share Price Per Share | $ / shares             $ 0.05                                              
Additional Number Of Shares Acquired | shares           5,000 5,000                                              
License Fee Expense             $ 101                                              
Reimbursement of license fees received           $ 133                                                
Gold equivalent of proceeds received (ounces) | oz           2,500 2,500                                              
Riddarhyttan Project [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of terms of option agreement                         Upon exercise of the option, EMX will retain a 3% NSR royalty, 0.75% of which may be purchased by South32 for US$1,900 within five years of executing the agreement. Upon exercise of the option, EMX will retain a 3% NSR royalty, 0.75% of which may be purchased by South32 for US$1,900 within five years of executing the agreement.                                
Riddarhyttan Project [Member] | USA South 32 [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Option agreement, interest                         100.00% 100.00%                                
Option agreement, exploration expenditures required                           $ 5,000                                
Proceeds from option agreement                           $ 200                                
Cathedral Well Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from option agreement                                           $ 33 $ 25              
Ounces of gold equivalent to payment | Ounce                                               20 20          
Hardshell Skarn Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual advance minimum royalty                                           13 10              
Copper Springs project [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from option agreement                                           66 50   $ 40          
Copper King [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from option agreement                                           66 50   50          
Buckhorn Creek Property [Member] | USA - Kennecott [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Option agreement, interest                             100.00%                              
Option agreement, exploration expenditures required                             $ 4,500                              
Proceeds from option agreement                             $ 550             50                
Superior West project [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual option payment $ 1,000                                         $ 133 100 $ 131 100          
Description of terms of net smelter return royalty Kennecott has the right to buy down 1% of the NSR royalty from underlying claim holders by payment of US$4,000 to EMX.                                                          
Option agreement, interest 100.00%                                                          
Option agreement, exploration expenditures required $ 5,500                                                          
Net smelter return royalty 2.00%                                                          
Proceeds from option agreement $ 149                                                          
Proceeds from purchase agreement $ 4,000                                                          
Yerington West Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual option payment                                               98 75          
Description of terms of net smelter return royalty                                     Under the agreement, once the earn-in has been completed, EMX can convert its interest to a 2.5% NSR. Hudbay has the option to buy down 1.5% of the NSR for US$4,500. Under the agreement, once the earn-in has been completed, EMX can convert its interest to a 2.5% NSR. Hudbay has the option to buy down 1.5% of the NSR for US$4,500.                    
Option agreement, interest                                     80.00% 80.00%                    
Option agreement, shares received | shares                                     85,000 85,000                    
Option agreement, exploration expenditures required                                     $ 1,000                      
Proceeds from option agreement                                     140                      
Advanced production payments                                     375                      
Annual royalty payment not yet received                                             75              
Swift And Selena Gold Projects [Member] | Ridgeline Minerals Corporation [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from milestone payments         $ 2,200                                                  
Proceeds from purchase agreement   $ 275                                                        
Proceeds from issuing shares   $ 249                                                        
Number of shares acquired | shares   2,077,718                                                        
Project ownership percentage acquired         9.90%                                                  
Share Price Per Share | $ / shares   $ 0.12                                                        
Execution payment (received)         $ 20                                                  
Production Royalty Percentage         3.25%                                                  
Non-dilution right through capital raises         $ 2,500                                                  
Sisorta Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual option payment                                             125   125          
Balya Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Net smelter return royalty                                           4.00%           4.00%    
Proceeds from an adjusted royalty payment                                             88   103          
Golcuk Transfer and Royalty Agreement [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Exploration license, ownership percentage                                   100.00%                        
Golcuk Transfer and Royalty Agreement, shares received | shares                                   3,000,000                        
Trab 23 And Alankoy Properties [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of gold payments associated with share purchase agreement                                                   Upon closing, EMX will receive 40 ounces of gold or cash equivalent for the Alanköy project (US$63 received in February 2020) and 30 ounces of gold or cash equivalent for the Trab-23 project (US$47 received in February 2020). EMX will receive an uncapped 2.5% NSR royalty on each project. For the Alanköy project, EMX will receive annual AAR payments of 35 ounces of gold for the first three years of the agreement, 45 ounces of gold in years 4 through 6 of the agreement, and 70 ounces of gold from and after the 7th anniversary. For the Trab-23 project, EMX will receive AAR payments of 35 ounces of gold through the 4th anniversary of the agreement, and 45 ounces of gold from and after the 5th anniversary. For each project, EMX will receive a milestone payment of 500 ounces of gold upon receipt of key mine development permits.        
Kimberley Copper Project [Member] | Enfield Exploration Corporation [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Number of shares commited under agreement | shares                       500,000                                    
Value of shares commited under agreement                       $ 1,000                                    
Number of shares issued upon achievement of certain milestones | shares                       1,750,000                                    
After Exercise Of Option Member | Riddarhyttan Project [Member] | USA South 32 [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of terms of option agreement                         After exercising the option, AAR payments of 50,000 pounds of copper or the cash equivalent will be due to EMX, but will be deductible from future royalty payments. After exercising the option, AAR payments of 50,000 pounds of copper or the cash equivalent will be due to EMX, but will be deductible from future royalty payments.                                
Between Fifth And Seventh Anniversaries [Member] | Yerington West Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual advance minimum royalty                                       $ 50                    
Between Eighth And Tenth Anniversaries [Member] | Yerington West Property [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual advance minimum royalty                                               $ 75            
Advanced production payments                                     $ 75                      
Every six months commencing February 1, 2017 [Member] | Aes Madencilik As [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of gold payments associated with share purchase agreement                               500 ounces of gold every six months commencing February 2, 2017 up to a cumulative total of 7,000 ounces of gold; 500 ounces of gold every six months commencing February 2, 2017 up to a cumulative total of 7,000 ounces of gold;                          
Within 30 days after the commencement of commercial production [Member] | Aes Madencilik As [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of gold payments associated with share purchase agreement                               7,000 ounces of gold within 30 days after the commencement of commercial production from the Property provided that prior gold payments will be credited against this payment; 7,000 ounces of gold within 30 days after the commencement of commercial production from the Property provided that prior gold payments will be credited against this payment;                          
Upon production of 100,000 ounces of gold [Member] | Aes Madencilik As [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of gold payments associated with share purchase agreement                               250 ounces of gold upon production of 100,000 ounces of gold from the Property; 250 ounces of gold upon production of 100,000 ounces of gold from the Property;                          
Upon production of an aggregate of 500,000 ounces of gold [Member] | Aes Madencilik As [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of gold payments associated with share purchase agreement                               250 ounces of gold upon production of an aggregate of 500,000 ounces of gold from the Property; 250 ounces of gold upon production of an aggregate of 500,000 ounces of gold from the Property;                          
Upon Completion Of Feasibility Study [Member] | Riddarhyttan Project [Member] | USA South 32 [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Description of terms of option agreement                         The AAR may be repurchased by South 32 for US$2,500. In addition, South32 will make milestone payments of: (a) 350,000 pounds of copper (or the cash equivalent) upon publication of a maiden resource on the project, and (b) 750,000 pounds of copper (or the cash equivalent) upon delivery of a feasibility study. The AAR may be repurchased by South 32 for US$2,500. In addition, South32 will make milestone payments of: (a) 350,000 pounds of copper (or the cash equivalent) upon publication of a maiden resource on the project, and (b) 750,000 pounds of copper (or the cash equivalent) upon delivery of a feasibility study.                                
Upon 500 ounces of gold [Member] | Aes Madencilik As [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from disposal of exploration and evaluation assets                                                 656          
Upon 600 ounces of gold [Member] | Aes Madencilik As [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from disposal of exploration and evaluation assets                                             $ 849   $ 608          
Second Anniversary Date Of Agreement [Member] | Swift And Selena Gold Projects [Member] | Ridgeline Minerals Corporation [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Definitive sales agreement, description of advanced annual royalty payments         (increasing by US$5 per year to a maximum of US$75)                                                  
Advanced royalty payments         $ 10                                                  
Upon Execution Of Agreement [Member] | BCE Inc [Member] | USA Mainspring, Arizona [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual option payment     $ 66 50                                                    
First Anniversary Date [Member] | BCE Inc [Member] | USA Mainspring, Arizona [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from annual option payment       50                                                    
Thirty Days After Completion Of Feasibility Study Member | BCE Inc [Member] | USA Mainspring, Arizona [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from milestone payments       $ 2,000                                                    
Norra Metals Corp. ("Norra")                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Proceeds from issuing shares                 $ 289                         $ 11                
Number of shares acquired | shares                 4,808,770                         356,500 356,500              
Project ownership percentage acquired                 9.90%                                          
Definitive sales agreement, description of equity ownership continuing obligation                                           Norra has the continuing obligation to issue additional shares of Norra to EMX to maintain its aggregate 9.9% interest in Norra, at no additional cost to EMX, until Norra has raised $5,000 in equity. Thereafter, EMX will have the right to participate pro-rata in future financings at its own cost to maintain its 9.9% interest in Norra. Norra has the continuing obligation to issue additional shares of Norra to EMX to maintain its aggregate 9.9% interest in Norra, at no additional cost to EMX, until Norra has raised $5,000 in equity. Thereafter, EMX will have the right to participate pro-rata in future financings at its own cost to maintain its 9.9% interest in Norra.              
Definitive sales agreement, description of net smelter royalty                 The Company will retain a 3% NSR royalty on the projects.                                          
Share Price Per Share | $ / shares                   $ 0.06                         $ 0.03              
Additional Number Of Shares Acquired | shares                                           5,000 5,000              
Norra Metals Corp. ("Norra") | British Columbia [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Definitive sales agreement, description of net smelter royalty                 EMX has also been granted a 1% NSR royalty on Norra's Pyramid project in British Columbia.                                          
Purchase and sale agreements subsequent to reporting date [Member] | Upon closing receive 40 ounces of gold [Member] | Trab 23 And Alankoy Properties [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Cash equivalents                                                     $ 63      
Purchase and sale agreements subsequent to reporting date [Member] | Upon closing receive 30 ounces of gold [Member] | Trab 23 And Alankoy Properties [Member]                                                            
Disclosure Of Exploration And Evaluation Assets [Line Items]                                                            
Cash equivalents                                                     $ 47