After regaining control of your character after initially meeting Momodi speak with the Overcompetitive Adventurer in the instance. When speaking with her she says this:

Overcompetitive Adventurer: Word is, an extremely valuable mineral vein was found deep within the Nanawa Mines. They say that's why they ain't allowin' none to enter.y
Appears to be an extra y on the end there. This happens in the Ul'dahn quest "Court in the Sands" before speaking to Momodi after the initial cutscene upon entering the Quicksand. I have to hand it to the dev team though, great reworking of the starter quests! I like it very much.