For filings with the FCA include the annex                                                                          
                                                                                                                        
    For filings with issuer exclude the annex                                                                           
                                                                                                                        
    TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                                                     
                                                                                                                        
    1. Identity of the issuer or the underlying issuer           Acacia Mining PLC                                      
    of existing shares to which voting rights are                                                                       
    attached: ii                                                                                                        
                                                                                                                        
    2 Reason for the notification (please tick the appropriate box or boxes):                                           
                                                                                                                        
    An acquisition or disposal of voting rights                                                                X        
                                                                                                                        
    An acquisition or disposal of qualifying financial instruments which may result                            ¨        
    in the acquisition of shares already issued to which voting rights are attached                                     
                                                                                                                        
    An acquisition or disposal of instruments with similar economic effect to                                  ¨        
    qualifying financial instruments                                                                                    
                                                                                                                        
    An event changing the breakdown of voting rights                                                           ¨        
                                                                                                                        
    Other (please                                                                                              ¨        
    specify):                                                                                                           
                                                                                                                        
    3. Full name of person(s) subject to the                                     BlackRock, Inc.                        
    notification obligation: iii                                                                                        
                                                                                                                        
    4. Full name of shareholder(s)                                                                                      
     (if different from 3.):iv                                                                                          
                                                                                                                        
    5. Date of the transaction and date on                                        20 May, 2016                          
    which the threshold is crossed or                                                                                   
    reached: v                                                                                                          
                                                                                                                        
    6. Date on which issuer notified:                                             23 May, 2016                          
                                                                                                                        
    7. Threshold(s) that is/are crossed or                   Total holding for BlackRock Investment Management (UK)     
    reached: vi, vii                                                        Limited has gone above 5%                   
                                                                                                                        
                                                               Total holding for BlackRock, Inc. remains above 5%       
                                                                                                                        
    8. Notified details:                                                                                                
                                                                                                                        
    A: Voting rights attached to shares viii, ix                                                                        
                                                                                                                        
    Class/type of   Situation previous             Resulting situation after the triggering transaction                 
    shares          to the triggering                                                                                   
                    transaction                                                                                         
    if possible                                                                                                         
    using           Number             Number      Number        Number of voting       % of  voting rights x           
    the ISIN CODE   of                 of          of shares     rights                                                 
                    Shares             Voting                                                                           
                                       Rights      Direct        Direct xi   Indirect   Direct      Indirect            
                                                                             xii                                        
                                                                                                                        
    GB00B61D2N63    20,570,723         20,570,723  N/A           N/A         24,886,717 N/A         6.06%               
                                                                                                                        
    B: Qualifying Financial Instruments                                                                                 
                                                                                                                        
    Resulting situation after the triggering transaction                                                                
                                                                                                                        
    Type of financial            Expiration Exercise/                 Number of voting           % of voting             
    instrument                             Conversion Period xiv     rights that may be         rights                  
                                 date                                acquired if the                                    
                                 xiii                                instrument is                                      
                                                                     exercised/ converted.                              
                                                                                                                        
    Securities Lending                                               1,438,561                  0.35%                   
                                                                                                                        
    C: Financial Instruments with similar economic effect to Qualifying Financial                                       
    Instruments xv, xvi                                                                                                 
                                                                                                                        
    Resulting situation after the triggering transaction                                                                
                                                                                                                        
    Type of financial   Exercise       Expiration Exercise/         Number of voting rights    % of voting rights          
    instrument          price          date    Conversion period instrument refers to       xix, xx                     
                                       xvii    xviii                                                                    
                                                                                                                        
    CFD                                                          46,188                     Nominal         Delta       
                                                                                                                        
                                                                                            0.01%           0.01%       
                                                                                                                        
    Total (A+B+C)                                                                                                       
                                                                                                                        
    Number of voting rights                                Percentage of voting rights                                  
                                                                                                                        
    26,371,466                                             6.43%                                                        
                                                                                                                        
    9. Chain of controlled undertakings through which the voting rights and/or the                                      
    financial instruments are effectively held, if applicable: xxi                                                      
                                                                                                                        
                                                                                                                        
     See Annex                                                                                                          
                                                                                                                        
    Proxy Voting:                                                                                                       
                                                                                                                        
    10. Name of the proxy holder:                                                                                       
                                                                                                                        
    11. Number of voting rights proxy holder will cease                                                                 
    to hold:                                                                                                            
                                                                                                                        
    12. Date on which proxy holder will cease to hold                                                                   
    voting rights:                                                                                                      
                                                                                                                        
                                                                                                                        
    13. Additional information:                            BlackRock Regulatory Threshold Reporting Team                
                                                                                                                        
    14. Contact name:                                      Laurel Clark                                                 
                                                                                                                        
    15. Contact telephone number:                          020 7743 3650                                                
                                                                                                                        

       

    Name                                   % of voting     % of voting rights Total of both  
                                           rights if it    through financial  if it equals or
                                           equals or is    instruments if it  is higher than 
                                           higher than the equals or is       the notifiable 
                                           notifiable      higher than the    threshold      
                                           threshold       notifiable                        
                                                           threshold                         
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock International Holdings, Inc.                                                   
                                                                                             
    BR Jersey International Holdings L.P.                                                    
                                                                                             
    BlackRock Group Limited                                                                  
                                                                                             
    BlackRock Investment Management (UK)   4.98%           0.03%              5.01%          
    Limited                                                                                  
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock Holdco 4, LLC                                                                  
                                                                                             
    BlackRock Holdco 6, LLC                                                                  
                                                                                             
    BlackRock Delaware Holdings Inc.                                                         
                                                                                             
    BlackRock Fund Advisors                                                                  
                                                                                             
    BlackRock Institutional Trust Company,                                                   
    National Association                                                                     
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock International Holdings, Inc.                                                   
                                                                                             
    BR Jersey International Holdings L.P.                                                    
                                                                                             
    BlackRock Group Limited                                                                  
                                                                                             
    BlackRock International Limited                                                          
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock Holdco 4, LLC                                                                  
                                                                                             
    BlackRock Holdco 6, LLC                                                                  
                                                                                             
    BlackRock Delaware Holdings Inc.                                                         
                                                                                             
    BlackRock Fund Advisors                                                                  
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock International Holdings, Inc.                                                   
                                                                                             
    BR Jersey International Holdings L.P.                                                    
                                                                                             
    BlackRock (Singapore) Holdco Pte. Ltd.                                                   
                                                                                             
    BlackRock Asia-Pac Holdco, LLC                                                           
                                                                                             
    BlackRock HK Holdco Limited                                                              
                                                                                             
    BlackRock Cayco Limited                                                                  
                                                                                             
    BlackRock Trident Holding Company                                                        
    Limited                                                                                  
                                                                                             
    BlackRock Japan Holdings GK                                                              
                                                                                             
    BlackRock Japan Co., Ltd.                                                                
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock International Holdings, Inc.                                                   
                                                                                             
    BR Jersey International Holdings L.P.                                                    
                                                                                             
    BlackRock Australia Holdco Pty. Ltd.                                                     
                                                                                             
    BlackRock Investment Management                                                          
    (Australia) Limited                                                                      
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock International Holdings, Inc.                                                   
                                                                                             
    BR Jersey International Holdings L.P.                                                    
                                                                                             
    BlackRock Group Limited                                                                  
                                                                                             
    BlackRock Advisors (UK) Limited                                                          
                                                                                             
    BlackRock, Inc.                                                                          
                                                                                             
    BlackRock Holdco 2, Inc.                                                                 
                                                                                             
    BlackRock Financial Management, Inc.                                                     
                                                                                             
    BlackRock Capital Holdings, Inc.                                                         
                                                                                             
    BlackRock Advisors, LLC