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(11)    Patent No :    AP 2268   
(21)    Application No :    AP/P/2008/004670   
(22)    Filing Date :    09.05.2007   
(24)    Date of Grant &    03.08.2011   
           
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
ZA    2006/03788    12.05.2006
(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW

(73) Applicant(s)

BHP BILLITON SA LIMITED, 200 Malibongwe Drive,

Randburg 2194,
South Africa

(72) Inventors

MULLER Elmar L, South Africa

BASSON Petrus, South Africa

NICOL Michael J, South Africa

et al

(74) Representative

HONEY & BLANCKENBERG
 

(51)  International  Classification   C22B 15/00 (2006.01)    C22B 3/06 (2006.01)
C22B 3/04 (2006.01)   


(54)    Title

Chloride heap leaching.

(57)    Abstract

A heap leaching method to recover copper from a primary copper sulphide mineral wherein the mineral is leached in an acidic chloride or mixed chloride/sulphate solution in the presence of oxygen with the surface potential

of the mineral below  600 mV (vs. SHE) to cause dissolution of the copper

(56)    Documents Cited :    WO 03/038137    US 2005/01 18081    US 5 316 567    EP 0214 324

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