Rabi'ah reported on the authority of more than one person saying: The Messenger of Allah ﷺ assigned as a fief to Bilal ibn al-Harith al-Muzani the mines of al-Qabaliyyah which is in the neighbourhood of al-Fur', and only zakat is levied on those mines up to the present day. (Using translation from Abū Dāʾūd 3061)   

أَنَّ النَّبِيَّ ﷺ أَقْطَعَ بِلَالَ بْنَ الْحَارِثِ الْمُزَنِيَّ مَعَادِنَ الْقَبَلِيَّةِ وَهِيَ مِنْ نَاحِيَةِ الْفُرْعِ فَتِلْكَ الْمَعَادِنُ لَا يُؤْخَذُ مِنْهَا إِلَّا الزَّكَاةُ إِلَى الْيَوْمِ  

[Machine] "He said that the Prophet ﷺ gave Bilal bin Al-Harith Al-Muzani the belongings of the tribes of Qabilah, their sitting and sleeping places, and the place where farming is good."  

أَنَّهُ قَالَ أَعْطَى النَّبِيُّ ﷺ بِلَالَ بْنَ الْحَارِثِ الْمُزَنِيَّ مَعَادِنَ الْقَبَلِيَّةِ جَلْسِيَّهَا وَغَوْرِيَّهَا وَحَيْثُ يَصْلُحُ الزَّرْعُ