Hawzah News Agency – While digging a canal in a public square, formerly a cemetery, a bone belonging to a corpse buried forty to fifty years ago is found. Is there anything wrong in touching such bones for the purpose of viewing them? Are the bones najis?

A: The bone of a Muslim corpse that has been given ghusl is not najis, though it is obligatory to bury it again under the ground.

Source: https://www.leader.ir/en/book/32/Practical-Laws-of-Islam