Original copper ore converted to copper oxide. This is then reduced with carbon.
Eg. malachite, which containts copper carbonate. Heat it.
The oxide is then heated with coke.
Or, spray copper mining waste with dilute acid in the presence of a bacterium. The bacteria will work on low grade ores. The copper is extracted from the solution by reduction with scrap iron.
Iron must be extracted from its own ore - requires energy. Carbon dioxide produced.
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