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  • 18
    They didn't start out with solid rock; there was already an extensive system of caverns. Commented Nov 6, 2017 at 7:21
  • 28
    Maybe they threw it into a mile-deep natural pit like the one Gandalf and the Balrog fell into? ;)
    – Adamant
    Commented Nov 6, 2017 at 7:36
  • 4
    Maybe they ground it to powder and let underground rivers carry it away.
    – Adamant
    Commented Nov 6, 2017 at 7:37
  • 16
    I thought they were mines? They mined that stuff. Check out what mines usually do with waste. Please be aware that in a pseudo iron age setting like lotr, mines like that cannot exist. They didn't have the technology. Waste disposal is the least of your problems. A gigantic hall in a mine sounds cool so it exists, but if you dig a bit deeper, it's all make believe and doesn't make sense.
    – Raditz_35
    Commented Nov 6, 2017 at 8:22
  • 2
    They dumped it into Caradhras dale, of course.
    – Edheldil
    Commented Nov 6, 2017 at 15:33