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Key management personnel (Tables)
 12 Months Ended
Jun. 30, 2020
Disclosure of transactions between related parties [abstract]  
Summary of Key Management Personnel
Key management personnel compensation comprises:
 
   
2020
   2019   2018 
   
US$
   US$   US$ 
Short-term employee benefits
  
 
12,564,637
 
   11,557,506    13,190,838 
Post-employment benefits
  
 
1,172,727
 
   1,490,716    1,506,108 
Share-based payments
  
 
13,514,588
 
   15,821,972    13,356,657 
  
 
 
   
 
 
   
 
 
 
Total
  
 
27,251,952
 
   28,870,194    28,053,603