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RELATED PARTY TRANSACTIONS AND BALANCES (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]      
Salaries and benefits $ 956 $ 860 $ 1,277
Office and miscellaneous 300 464 925
Exploration and evaluation assets 5,361 5,527 4,810
Oniva International Services Corp. [Member]      
Disclosure of transactions between related parties [line items]      
Salaries and benefits 594 450 297
Office and miscellaneous 560 567 507
Exploration and evaluation assets 353 352 248
Total cost $ 1,507 $ 1,369 $ 1,052