ChalcopyriteChalcopyrite, an abundant source of copperCopper, is noted to undergo slow dissolutionDissolution under ambient conditions due to the formationFormation of secondary mineralsSecondary minerals at the chalcopyriteChalcopyrite surface, also referred to as surface passivationPassivation. Although the passivationPassivation mechanism has been extensively studied, the present modelsModel do not adequately account for it. This study investigates the impact of secondary mineralSecondary minerals formationFormation on copper extractionCopper extraction from chalcopyriteChalcopyrite. A reaction pathway modelModel (RPM) incorporating a surface passivationPassivation modelModel (SPM) was developed to simulate the dissolutionDissolution process and the formationFormation of secondary mineralsSecondary minerals like jarositeJarosite. The study also highlights the importance of considering the role of different gangue minerals, such as hematiteHematite and gypsumGypsum, which can influence copperCopper dissolutionDissolution rates. RPM with different rate laws describing proton-promoted, ferricFerric-ironIron promoted, and combined ferricFerric-ironIron-proton-promoted chalcopyrite dissolutionChalcopyrite dissolution in the presence of gangue minerals in chlorideChloride system were used. The reaction mechanism that facilitated the fastest dissolutionDissolution of chalcopyriteChalcopyrite was that promoted by ferricFerric ironIron. Nonetheless, the production of ironIron-hydroxy sulphates (like jarositeJarosite), ironIron oxide (hematiteHematite), and various gangue minerals inhibited the mobilisation of copperCopper, underscoring the significance of precisely depicting primary and secondary reactions, their co-location, and their reaction behaviour. The results of this investigation are significant because they offer fresh perspectives on the simultaneous processes governing copper recoveryCopper recovery in heapsHeap and the most effective modellingModelling techniques for these reactions.