«الْمَعْدِنُ بِمَنْزِلَةِ الزَّرْعِ، يُؤْخَذُ مِنْهُ الزَّكَاةُ، كَمَا تُؤْخَذُ مِنَ الزَّرْعِ حِينَ يُحْصَدُ
that minerals are treated like agricultural produce, and are subject to zakat, just as it is charged on agricultural goods at the time of harvest