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Other Long-Term Assets
6 Months Ended
Jun. 30, 2012
Other Assets Noncurrent [Abstract]  
Other Long-Term Assets
  At June 30,At December 31,
  20122011
  (unaudited) 
   (in US Dollars, millions)
    
 Investments in associates - unlisted55
 Investments in associates - listed1915
 Investments in equity accounted joint ventures803671
 Carrying value of equity method investments827691
    
 Investment in marketable equity securities - available for sale7282
 Investment in marketable debt securities - held to maturity88
 Investment in non-marketable assets - held to maturity22
 Cost method investment99
 Investment in non-marketable debt securities - held to maturity8785
 Restricted cash2423
 Other non-current assets117101
  1,1461,001
    

Investments in associates

During the six months ended June 30, 2011, the Company fully impaired its investment in Orpheo (Proprietary) Limited. An impairment loss of $2 million (net of tax of $nil million) was recognized and the impairment loss is reflected in equity income in associates for the first half of 2011.

     
  Investment in marketable equity securities - available for sale  
     
  Available for sale investments in marketable equity securities consists of investments in ordinary shares.  
     
  Cost 52 51
  Gross unrealized gains 24 34
  Gross unrealized losses (4) (3)
  Fair value (net carrying value) 72 82
     
   Six months ended June 30,
   20122011
   (unaudited)(unaudited)
    (in US Dollars, millions)
     
  Other-than-temporary impairments of marketable equity securities – available for sale  
     
  First Uranium Corporation (South Africa)1 -
  Village Main Reef Limited (South Africa) -2
    1 2
     
  The impairment recognized resulted in a transfer of fair value adjustments previously included in accumulated other comprehensive income to the income statement.  
     
  In addition, the Company holds various equities as strategic investments in gold exploration companies. Four of the strategic investments are in an unrealized loss position and the Company has the intent and ability to hold these investments until the losses are recovered.  

       
 The following tables present the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by length of time that the individual securities have been in a continuous unrealized loss position:  
       
  Less than 12 monthsMore than 12 months   
  Total  
       
  (in US Dollars, millions)  
       
 At June 30, 2012     
       
 Aggregate fair value of investments with unrealized losses 5 - 5  
 Aggregate unrealized losses (2) (2) (4)  
       
 At December 31, 2011     
 Aggregate fair value of investments with unrealized losses 8 - 8  
 Aggregate unrealized losses (3) - (3)  
       

      At June 30,At December 31,
      20122011
      (unaudited) 
       (in US Dollars, millions)
     
  Investment in marketable debt securities - held to maturity88
  Investments in marketable debt securities represent held to maturity government bonds held by the Environmental Rehabilitation Trust Fund with a total fair value of $11 million (2011: $11 million) and gross unrealized gains of $3 million (2011: $3 million).  
     
  Investment in non-marketable assets - held to maturity22
  Investments in non-marketable assets represent secured loans and receivables secured by pledge of assets.  
        
  Cost method investment99
  The cost method investments mainly represent shares held in XDM Resources Limited. (1)  
        
  Investment in non-marketable debt securities - held to maturity8785
  Investments in non-marketable debt securities represent the held to maturity fixed-term deposits required by legislation for the Environmental Rehabilitation Trust Fund and Nufcor Uranium Trust Fund.  
        
  As at June 30, 2012 the contractual maturities of debt securities were as follows:  
        
  Marketable debt securities     
        
  Three to seven years   8 
        
        
  Non-marketable debt securities     
        
  Less than one year   87 
        
  Restricted cash2423
  Restricted cash mainly represents cash balances held by Environmental Rehabilitation Trust Fund and Environmental Protection Bond.  
        
  Financing receivables  
  Loans of $89 million (2011: $29 million) to equity accounted joint ventures and associates are included in Other long-term assets. There are no allowances for credit losses relating to these loans. Credit quality of loans is monitored on an ongoing basis.  
        
  (1) The fair value is not estimated as there are no identified events or changes in circumstances that may have a significant adverse effect on the fair value of the investment and it is not practicable to estimate the fair value of the investment.