Umicore Precious Metals, Inc. – Refining Services & Mill Product Provider Umicore Precious Metals USA, Inc. is a trusted precious metal refiner and a supplier of quality mill products. Umicore’s REFINING SERVICES for the jewelry and industrial markets include refining metallics, sweeps, and ash with assaying and trading services for gold, silver, platinum and palladium. Additionally, Umicore supplies quality MILL PRODUCTS in grain, round and shaped wire, sheet, strip, rings and ring tube. Umico