The Messenger of Allah said: "The injuries caused by the well are without liability, [1] and beasts are without liability, and mines are without liability, and the Khumus is due on Rikaz." (Using translation from Nasāʾī 2498)  

قَالَ رَسُولُ اللَّهِ ﷺ «الْعَجْمَاءُ جُرْحُهَا جُبَارٌ وَالْبِئْرُ جُبَارٌ وَالْمَعْدِنُ جُبَارٌ وَفِي الرِّكَازِ الْخُمُسُ»  

Messenger of Allah 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." (Using translation from Bukhārī 6912)  

عَنِ النَّبِيِّ ﷺ قَالَ «جُرْحُ الْعَجْمَاءِ جُبَارٌ وَالْبِئْرُ جُبَارٌ وَالْمَعْدِنُ جُبَارٌ وَفِي الرِّكَازِ الْخُمُسُ»  

[Machine] From the Prophet ﷺ, he said, "The metal is strong, the sailing ship is strong, the well is strong, and in the fifth is the scale."  

عَنِ النَّبِيِّ ﷺ قَالَ «الْمَعْدِنُ جُبَارٌ وَالسَّائِمَةُ جُبَارٌ وَالْبِئْرُ جُبَارٌ وَفِي الرِّكَازِ الْخُمُسُ»