Allah's Messenger (ﷺ) said, "There is no Diya for persons killed by animals or for the one who has been killed accidentally by falling into a well or for the one killed in a mine. And one-fifth of Rikaz (treasures buried before the Islamic era) is to be given to the state."
Reference: Sahih al-Bukhari 6912 In-book : Book 87, Hadith 50 USC-MSA web (English) : Vol. 9, Book 83, Hadith 47 (deprecated)
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