Tribute, Spoils, and Rulership (Kitab Al-Kharaj, Wal-Fai' Wal-Imarah)
Dawud :: Book 19 : Hadith 3055
Narrated Rabi'ah ibn AbuAbdurRahman:
Rabi'ah reported on the authority of more than one person saying: The Apostle of Allah (peace_be_upon_him) 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.