North Korea's Foreign Ministry said Saturday that all of the tunnels at the country's northeastern testing ground will be destroyed by explosion, and that observation and research facilities and ground-based guard units will also be removed.
The North said it plans to invite journalists from the United States, South Korea, China, Russia and Britain to inspect the process.
Kim had revealed plans to shut down the nuclear test site during his summit with South Korean President Moon Jae-in last month.
The nuclear facility was hidden in Mount Mantap and suffered multiple landslides following the bomb tests.
US Secretary of State Mike Pompeo said that if North Korea agrees to surrender its nuclear arsenal, Washington will work with Pyongyang to rebuild its tiny economy.
"If North Korea takes bold action to quickly denuclearise, the United States is prepared to work with North Korea to achieve prosperity on par with our South Korean friends."
