Old Mines

The Old Mines are located in the northeastern part of Tharsis.

Summary
Ascraeus Chasmata wasn't of much interest until a large uranium deposit was found while searching for sills filled with lava. An automated mine was built and Mars started exporting uranium to Earth. This find would enable humans to go further out in the solar system than ever before.

The mines were automated and self-sustainable so there is still uranium being extracted daily. There isn't much of interest inside unless you enjoy looking at minecarts.