Treadwell : A process for extracting copper from chalcopyrite by leaching with the stoichiometric quantity of sulfuric acid: CuFeS2 + 4H2SO4 + CuSO4+ FeSO4 + 2SO2 + 2S + 4H2O. (Check source for accuracy of chemical formula)
Comyns, Alan E. Dictionary, Encyclopedic Dictionary of Named Processes in Chemical Technology (3rd ed.), Alan E. Comyns (Ed.), Boca Raton, FL, CRC Press LLC, USA 2000, http://worldtracker.org/media/library/Science/Chem istry/Synthesis/Encyclopedic%20Dictionary%20of%20N amed%20Processes%20in%20Chemical%20Technology.pdf, (Named Chem Procss - Amer) {35}