123 North Main St Dallas, SD 57529 Phone: 605-835-8365 or 888-325-3333. ... Radium was discovered in 1898 by Marie Curie and Pierre Curie. They managed to extract 1 mg of radium from ten tonnes of the uranium ore pitchblende (uranium oxide, U 3 O 8), a considerable feat, given the chemically methods of separation available to them.They ...