Answer:
Step-by-step explanation:
Mostly mining products. North Korea is a source for some rare earths and its industrial base doesn't need them at this time so they are exports (mainly happily received by China).
Iron is more common and there is enough there that it can be an export. Zinc is pretty common too. Zinc can go hand in hand with iron ore. North Korea exports 6 billion tons of Magnesite which is a huge amount. Tungsten is also on its list of exports.
Generally speaking North Korea has minerals and some agricultural products and South Korea does the manufacturing.