Book of Enoch (1 Enoch) 67:4
And He will imprison those angels, who have shown unrighteousness, in that burning valley which my grandfather Enoch had formerly shown to me in the west among the mountains of gold and silver and iron and soft metal and tin.
Background and history of Book of Enoch (1 Enoch), and issues with this book.
R. H. Charles, The Book of Enoch (London: SPCK, 1917), public domain. The verse text is the English Wikisource transcription of that translation. Charles’s editorial signs are kept. He rearranges some verses in chapters 5, 39, 90, 91, and 106, so those chapters are not a straight 1, 2, 3 sequence.