Is the Khums due on extracted minerals when the extraction occurs after the purchase of the ore dust?
Chapter on Zakat on Gold and Silver
Al-Mughni
Book of Zakat
Primary text
The Khums (one-fifth) is incumbent upon the one who extracts the mineral. In the case where ore dust was purchased and the mineral was subsequently extracted, Ali ibn Abi Talib initially held the Khums due upon the extractor, implying that the mineral itself, upon extraction, is subject to the Khums rule.
Supporting text
The ruling ultimately focused on Zakat being due on the seller of the ore dust based on the value of the commodity he possessed (the one hundred sheep value), treating the Zakat obligation as fixed upon the seller, thereby circumventing a direct ruling on the Khums obligation on the buyer who extracted the value, given the context of Zakat on ore sales.