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Right-of-use assets (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
Balance, opening $ 7,194,195
Balance, ending 7,035,733
Prepaid land lease payments [Member]  
Balance, opening 7,194,195
Amortization charge for the period (40,244)
Foreign exchange adjustment (118,219)
Balance, ending $ 7,035,732