(6) Zakat
كتاب الزكاة
(2a) Chapter: Property on which Zakat is Payable - Section 1
(1) باب ما يجب فيه الزكاة - الفصل الأول
Mishkat al-Masabih 1798 
Abu Huraira reported God’s messenger as saying, “No retaliation is payable for a wound caused by a dumb animal, or for an accident in a well or a mine, but a fifth is payable on buried treasure.” * (Bukhari and Muslim.) * The word used (rikaz) is applied to treasure buried by people in pre-Islamic times; but the word may also mean metal in mines.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «العجماء جرحها جَبَّار والبشر جَبَّار والمعدن جَبَّار وَفِي الرِّكَاز الْخمس»
 مُتَّفَقٌ عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 1798
In-book reference : Book 6, Hadith 27