Knob Hill Mine

Knob Hill Mine is a cut location from Fallout New Vegas. It is mentioned on the Rezzed 2013 concept map, and is also referenced twice in the PRIMA Fallout New Vegas strategy guide. The first reference is on the entry for Techatticup Mine;

"Also known colloquially in the past as Knob Hill Mine, this hole in the ground is at the turnaround at the end of the road from Nelson, and seems to have been a dumping ground, or storage area for radioactive waste that the Legion now occasionally utilizes.".

This passage suggests that the area may have been an early name for Techatticup Mine. Elsewhere in the guide, "Knob Hill" (sans "Mine") is described as a secondary location.

"This rarely tracked area offers exceptional views of the river. At this point there’s a filled-in mine shaft that used to lead to Techatticup Mine [6.08]."

This area can still be seen in the final game, but it is not marked. It's as described in the guide, and consists of nothing but a rubble-filled mineshaft entrance.