Qeneb too Kah'Aiye (Location)
This First Civilization location can be reached via the Seth Anat Tomb, in the Desheret Desert.
From the tablet room in Seth Anat, clear another cobwebby mirror for the beam to lead you west.
Scanning as you go, because there's scads of silica about, approach the pillar at the end of the beam. You'll need to spend five silica to activate it.
This activation completes the mission.