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(11)    Patent No :    AP 2742    (73) Applicant(s)           
(21)    Application No :    AP/P/2010/005105    METALEACH LIMITED, Akara Building, 24    De Casto Street,       
            Wickhams Cay 1, Road Town 1110, Tortola,       
                   
(22)    Filing Date :    11.07.2008    British Virgin Islands           
(24)    Date of Grant &    04.09.2013               
                       
(45)    Publication :

(30)  Priority Data    (72) Inventors

    (33) Country    (31) Number    (32) Date    JOHNSTON Garry, Mervyn, Australia   
    US    2007903815    13.07.2007    SUTCLIFFE Matthew Leslie, United Kingdom   
    AU    2007906262    15.11.2007       
                WELHAM Nicholas James, Australia   
                   
                et al   
                (74) Representative   
(84)    Designated State           
               
    BW  MZ   NA    TZ   ZM        GALLOWAY & COMPANY   
                ZIMBABWE   
               
(51)    International    Classification    C22B 3/14 (2006.01)   

(54)    Title

Method for ammoniacal leaching

(57)    Abstract

In accordance with the present invention there is provided a method for leaching one or more target metals from an ore, the method comprising the method steps of: curing the ore to be leached through the application of an aqueous solution of a curing agent, producing a cured ore; leaching the cured ore at atmospheric pressure through the application of an ammonium carbonate solution containing free ammonia, producing a pregnant leach solution; and passing the pregnant leach solution to a means for metals recovery.

(56)    Documents Cited :    WO 2004/067787 A1    GB 715 243 A    CA 2072 714 A1

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