It was only found in Khazad-d Ã '' m ( Moria ) , where it was mined by the Dwarves , and ( perhaps ) in NÃ menor . In The Lord of the Rings , Tolkien writes that mithril was found only in Khazad-d Ã '' m ( Moria ) in Middle-earth , where it was mined by the Dwarves . In Unfinished Tales he writes that it was also found in NÃ menor .