Ali ibn Mahziyar, from Fadalah and Ibn Abi Umayr, from Jamil, from Muhammad ibn Muslim, from Abu Ja’far عليه السلام, peace be upon him, who said: I (narrator) asked Imam عليه السلام about ‘mines of gold, silver, brass (sufr), iron, and lead.’ Imam عليه السلام said: "Upon all of them is the fifth (khums)."