Hudhayl bin Shurahbil said: The Messenger of Allah (peace and blessings be upon him) said: "(Injury caused in) a mine is unavenged (no compensation is due), a well is unavenged, a grazing animal is unavenged, the foot (of a riding animal) is unavenged, and in buried treasure (rikaz) there is one-fifth." This is the wording of al-Thawri's narration. In the narration of al-A'mash: "The animal is unavenged, the well is unavenged, the mine is unavenged, the foot is unavenged, and in buried treasure there is one-fifth."
This is mursal; no proof is established by it. Qays bin al-Rabi' narrated it as connected (mawsul), mentioning Abdullah bin Mas'ud in it, and Qays is not used as proof.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الأشربة والحد فيها / 17692