And from him, from Ibn Abi Umayr, from Hammad, from al-Halabi, who said: I (narrator) asked Abu Abdillah عليه السلام, peace be upon him, about ‘ambergris and diving for pearls.’ Imam عليه السلام said: "Upon it is the fifth." He (narrator) said: “And I asked Imam عليه السلام about ‘treasure, how much is in it?’” – meaning khums. Imam عليه السلام said: "The fifth." And (Imam عليه السلام was asked) about ‘mines, how much is in them?’ Imam عليه السلام said: "The fifth." And (Imam عليه السلام was asked) about ‘lead, brass (sufr), iron, and whatever is in the mines, how much is in them?’ Imam عليه السلام said: "It is taken from them just as it is taken from the mines of gold and silver."