Is leaching of malachite copper ores with ammonia possible as a substitute of sulphuric acid?

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Mohsen Azmayandeh

Yes. it is possible

You can recover copper from malachite and other copper and carbonate minerals with ammonia solution

See this articles

http://www.sciencedirect.com/science/article/pii/S0304386X04001586

http://link.springer.com/article/10.1007/BF02654048

Arman Ehsani

In general, you can use Ammonia as reagent to extract copper from carbonate minerals. However, you should notice the Eh-pH (pourbaix) diagram and stability of ions in the leach solution.