United States Dollar  
  Figures in millions unless otherwise stated 2018      2017   
17. INVESTMENTS          
  Listed          
  At fair value through OCI (2017: available for sale financial assets) 93.0     99.0  
  Unlisted          
  Asanko redeemable preference shares1 132.9      
  Other 0.1     0.1  
  Derivative instruments          
  Warrants2 9.3     5.5  
  Total investments3 235.3     104.6  
  1 Consists of 164,939,999 redeemable preference shares at par value for US$164,939,999.
    The following table shows a reconciliation from the fair value at acquisition to the fair value of the redeemable preference shares at the end of the year (level 3 financial instrument):
   
Fair value at acquisition 129.9
Net change in fair value (recognised in OCI) 3.0
Fair value at end of the year 132.9
    The fair value is based on the expected cash flows of the Asanko Gold mine based on the life-of-mine model. The following key inputs were used in the valuation of the fair value:
   
Par value of the preference shares US$165.0 million
Market-related interest rate 7,85%
Expected redemption period 5 years
    Any reasonable change in the timing of the cash flows or market-related discount rate could materially change the fair value of the redeemable preference shares (refer note 38 for sensitivity analysis performed).
    Refer to notes 15 and 16.1 (b) for further details
  2 Consists of 10.0 million common share purchase warrants of Maverix. Refer note 16.1 (c) for further details.
  3 With the adoption of IFRS 9, all listed investments were reclassified from available-for-sale financial assets to financial assets designated at fair value through OCI. Refer note 43 for details of major investments.