While more can always be said, /u/ParallelPain writes precious metal (especially silver), then copper export from Nagasaki in early Edo Period recently in the following threads:

• How did the Dutch acquire such good relations with the Japanese Shogunate, that only they were allowed to trade and exchange knowledge with them?
• If Japanese sea trade was so successful in the early 17th century, why did the Tokugawa shogunate decide to end it?
• Some summary trade statistics from Nagasaki

I also cited some key text that describes Japan as "a land of silver" in the surge of global silver trade in the 16th century before: How extensive was knowledge of Japan before Westerners landed there?.