HAR - Harmony - Buyback of Hidden Valley Royalty agreement                      
HARMONY GOLD MINING COMPANY LIMITED                                             
Incorporated in 1950                                                            
Registration number 1950/038232/06                                              
Share code: HAR                                                                 
Issuer Code: HAPS                                                               
ISIN: ZAE000015228                                                              
BUYBACK OF HIDDEN VALLEY ROYALTY AGREEMENT                                      
Harmony Gold Mining Company Limited (the "Company") today announced that it has 
concluded negotiations with Rio Tinto Limited ("Rio Tinto") in terms of which   
the parties have agreed that Harmony purchase the Rio Tinto rights under the    
royalty agreement entered into prior to the acquisition by Harmony of the Hidden
Valley and Kerimenge deposits in Papua New Guinea.  In terms of the royalty     
agreement Rio Tinto has the right ("royalty rights") to receive a portion of    
between 2% and 3.5% of future ounces produced by the Hidden Valley mine in Papua
New Guinea.                                                                     
The consideration payable by Harmony to Rio Tinto will be US$22.5 million       
settled as follows:                                                             
-    1,250,523 new ordinary shares of 50 South African cents each, to be issued 
as fully paid up                                                            
-    the balance of US$2.5 million payable in cash on the effective date.       
The listing of the consideration shares will commence on 29 March 2007 and the  
agreement is effective from the day on which the consideration is settled, being
the date of the allotment and issue of the consideration shares.                
The rationale for the transaction is based on the fact that the cash costs per  
ounce of gold produced at Hidden Valley will be reduced by US$13 per ounce.     
The effect of the acquisition on the earnings per share and net asset value per 
share of Harmony for the half-year year ended 31 December 2006, assuming the    
acquisition had taken effect from 1 July 2006, will be insignificant.           
Johannesburg                                                                    
28 March 2007                                                                   
Sponsor                                                                         
Merrill Lynch South Africa (Pty) Limited                                        
For further information contact                                                 
Bernard Swanepoel                                                               
Chief Executive - Harmony Gold                                                  
Cell. +27 83 303 9922                                                           
Amelia Soares                                                                   
General Manager, Investor Relations                                             
Cell. +27 82 654 9241                                                           
Lizelle du Toit                                                                 
Investor Relations Officer                                                      
Cell. +27 82 465 1244                                                           

Date: 28/03/2007 09:30:00 Supplied by www.sharenet.co.za                     
Produced by the JSE SENS Department                             .