Chapter on Zakāt for Extracted Minerals, Buried Treasure (rikāz), and Trade

Whoever brings gold or silver out of a mine must pay one-quarter of one-tenth (2.5 %). According to another opinion, the due is one-fifth. A third view draws a distinction: if the wealth is obtained through labor, the rate is one-quarter of one-tenth; if not, it is one-fifth.

For both categories, the nisab is a requirement, whereas the completion of a full lunar year is not, according to the school. The various extractions are added together so long as the work is continuous, and—in the newer opinion—continuity of the actual yield is not a condition.

And if he discontinues