17. AVAILABLE-FOR-SALE FINANCIAL ASSETS (NON-CURRENT) (CONTINUED) 18. DERIVATIVE FINANCIAL INSTRUMENTS (NON-CURRENT) Unlisted shares Listed shares Derivatives - held for trading (a) Instruments used by the Consolidated Entity 19. INVESTMENTS IN ASSOCIATES (NON-CURRENT) 89  NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS FOR THE YEAR ENDED 30 JUNE 2011 2011 2010 (a) Investment details Listed Westgold Resources Limited 22,801,822  19,170,160  Aragon Resources Limited - 3,355,753  22,801,822  22,525,913  2011 2010 Derivatives - held for trading 228,269  57,464  Available-for-sale investments consist of investments in ordinary shares, and therefore have no fixed maturity date or coupon rate. The fair value of listed available-for-sale investments has been determined directly by reference to published price quotations in  an active market. The Consolidated Entity has a 3.23% (2010: Nil) ownership interest in Independence Group NL which is a listed resources  company. During the period Independence Group NL completed a takeover of Jabiru Metals Limited. As a result of the takeover the  Consolidated Entity sold its ownership interest (2010: 19.99%) in Jabiru Metals Limited to Independence Group NL. Consideration  received for the Jabiru Metals Limited shares was $48,089,540 in cash and 6,558,571 shares in Independence Group NL. The Consolidated Entity has a 16.97% (2010: Nil) ownership interest in Mongolian Resource Corporation Limited which is a listed  resources company. During the period the Consolidated Entity disposed of its interest in Icon Resources Limited, which is a listed exploration company  (2010: 4.76% ownership interest). The fair value of the unlisted available-for-sale investments has been estimated using valuation techniques based on  assumptions, which are outlined in note 2(l), that are not supported by observable market prices or rates. Management believes  that the estimated fair value resulting from the valuation techniques and recorded in the statement of financial position and the  related changes in fair value recorded in other comprehensive income are reasonable and the most appropriate at the reporting  date. The Consolidated Entity has a 25% (2010: Nil) ownership interest in Aziana Exploration Corporation, which is an unlisted  exploration company. The Consolidated Entity holds 670,000 unlisted options in Mongolian Resource Corporation Limited ("MRC"). These options were  acquired for nil cost as part of a capital raisind in MRC. On acquisition the options were valued using the binomial method. The fair  value of the options have been determined using the binomial method. In 2010 the Consolidated Entity held 3,830,929 options  in Aragon Resources Limited. These options were acquired for nil cost on 30 July 2007 as part of the IPO of Aragon Resources  Limited. On acquisition the options were valued using the binomial method. The options expired unexercised in September 2010. The Consolidated Entity is party to derivative financial instruments in the normal course of business in order to manage exposure  to fluctuations in commodity prices in accordance with the Consolidated Entity's financial risk management policies (refer to note  4).