Recent high-resolution satellite imagery shows that the sludge-covered area within a settling pond at North Korea’s Pyongsan uranium concentration plant grew by about 0.8 hectares, roughly the size of one and a half soccer fields, over approximately nine months in 2026. Sludge is the dark residue left behind after uranium ore is processed into yellowcake, a solid form of uranium oxide used to make nuclear fuel. The expansion suggests refining ac…