What is yellowcake, exactly?
Yellowcake is milled uranium oxide, known to chemists as U3O8. When uranium ore comes out of the mine, it actually contains fairly little of the precious radioactive element. Though some mines in Canada, the world’s leading uranium producer, are now yielding ore that contains 20 percent uranium, lower purity levels are more typical. Ore that contains less than 1 percent uranium is not unusual.
