40 Material processing, namely, obtaining metals from native earth materials, ores, minerals, and waste materials; metal, ore and mineral refining and purifying services, namely, aluminum, iron, zinc, copper, gold, silver, molybdenum, cobalt, magnesium, lithium, manganese, nickel, palladium, platinum, thorium, phosphorus, uranium, titanium, silicon, gallium, rare earth metals, namely scandium, yttrium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, and mixtures thereof; refining and purifying of salts and various chemicals and derivatives thereof, namely, oxides, hydroxides, chlorides, sulfates, sulfides, nitrate, nitride, alloys refining and purifying.