guess it is easier to process oxide ores if they are anything like oxide ores that have gold in them could possibly even heap leach them. Sulphide ores tend to be refractory in nature ie harder to process at one time they were called refractory because they needed to be smeltered to remove the ore nowdays fine grinding and biox systems seem to do the trick. SO given the same grade I would go for oxide ores to process, they also tend to be shellower than sulphide ore so mining costs tend to be lower. I am not a geo or metallurgist though so probably wrong in my assumptions. Also need to know the type of copper ie malachite chalcopyrite etc to work out process system including flotatation.
