Book of Enoch (1 Enoch) 52:2
There mine eyes saw all the secret things of heaven that shall be, a mountain of iron, and a mountain of copper, and a mountain of silver, and a mountain of gold, and a mountain of soft metal, and a mountain of lead.
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.