I think Moria was the only place the dwarves (or anybody else) ever found mithril. I don't think they thought they would find it anyplace else. One has to assume they looked for it throughout the Misty and Grey Mountains during the millennia they largely had free rein in the area.
I think HerenIstarion may be on something with it being lonely. They may have thought it was a small place stuck in the middle of nowhere (they were used to romping about entire mountain ranges, after all). This is partially a reference to the murmurs that Gloin mentions to Frodo.
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...finding a path that cannot be found, walking a road that cannot be seen, climbing a ladder that was never placed, or reading a paragraph that has no...
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