Forty years ago, industrially proven and applied nitrogen species catalyzed (i.e. NSC) acidic pressure leachingPressure leaching was commercialized on an industrial scale. It has been utilized to treat a number of ores, concentratesConcentrate and recycled materials. This versatile technologyTechnology offers many advantages including low temperatures, low pressures, low capital costs, low operating costsOperating Cost, faster throughputThroughput and less costly materials of constructionConstruction than conventional pressure oxidation. This paper will elucidate the application of this technologyTechnology for production of goldGold, silverSilver, palladium, rhodium, zincZinc, germanium, gallium, cobaltCobalt, copperCopper and nickelNickel. Recycled material applications will also be elucidated. In addition, details of an application for treatment of a refractoryRefractories chalcopyriteChalcopyrite copperCopper and goldGold bearing ore will be presented and pertinent economics discussed. Finally, details concerning a future demonstration plant with a continuous reactor will be elucidated.