North Korea may not have proved petroleum reserves, but it's estimated that the secluded belligerent nation sits on reserves of more than 200 minerals--including rare earth minerals--worth an estimated up to US$10 trillion.
Of course, there are no official reports on how much North Korea's mineral wealth really is, but according to rough estimates from earlier this decade, Pyongyang's deposits of coal, iron ore, zinc, copper, graphite, gold, silver, magnesite, molybdenite, and many others, are worth between US$6 trillion and US$10 trillion, as per South Korean projections reported by Quartz.
