I don't know if it has any truth in it, or where I got the idea, but I always thought that after men began to take over the world, the dwarves went to the mountains (possibaly retook Moria, and it becam Khazad-Dum again). The mountains were "closed up" by the dwarves, and then they passed out of all knowlodge. And to this day, they are probally still there, mining and making, content as dwarves can be. That is my opinion.
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