Board Thread:Episode Discussion/@comment-4141313-20190126081959/@comment-4141313-20190131141143

Ilia grew up in Mantle, and her parents worked in the mines there. They worked to make sure she could attend an Atlesian School so long as she hid her Faunus traits.

Ilia: We lived in Mantle with the other Faunus working the mines. But my parents wanted something better for me. They managed to enroll me in an Atlas prep school. Imagine that - a little Faunus girl from Mantle going to the city of dreams. (sighs) I felt like a princess.

And since Atlas is effectively Laputa, its doubtful there are any Atlas Mines, but there are Mantle Mines.