TSK · Numbers 31:22

And Zillah, she also bare Tubalcain, an instructer of every artificer in brass and iron: and the sister of Tubalcain [was] Naamah.

But all the silver, and gold, and vessels of brass and iron, [are] consecrated unto the LORD: they shall come into the treasury of the LORD.

Iron is taken out of the earth, and brass [is] molten [out of] the stone.