According to public information, North Korea has a known uranium enrichment facility located in Yongbyon. In 2010, North Korea disclosed the Yongbyon uranium enrichment facility to American nuclear expert Dr. Siegfried Haacke, claiming at the time that 2,000 centrifuges were in operation. In 2019, South Korean military officials estimated that the Yongbyon area produced approximately 40 kilograms of highly enriched uranium annually.
South Korea also believes North Korea has other uranium enrichment facilities. South Korean media outlets claim that the “more facilities” Trump mentioned are underground highly enriched uranium facilities in North Korea’s Bonkang region, where it is speculated there may be over 10,000 centrifuges. The US and South Korea also believe North Korea has at least three suspected uranium enrichment bases: in the Hajia area of Jagang Province, the Pyeongsan area of North Hwanghae Province, and the Bokchon area of North Pyongan Province. Pyeongsan is a North Korean uranium mine, and the nearby Banghyeon Airport in Guseong City has long been considered by the US to be another “secret uranium enrichment facility.”
South Korean military officials said that combined with the capacity of other facilities, North Korea can produce about 120 kilograms of highly enriched uranium each year, which can be used to make nuclear weapons.
