Black Mountain Ridge is a spot in the Iron Butte valley with a historical marker about Iron Butte itself, an old volcano. Stop by if you are filling out the historical marker collection.
The marker is the only reason to come. It counts toward the historical marker collectibles for Iron Butte, which has 6 in all.
Cloverdale Research Iron Butte Facility
The Cloverdale Research Iron Butte Facility is a high-security private lab in Iron Butte, still powered two years after the outbreak. You only go here with Sarah for the story, so there is no open-world job to clear.
Iron Butte NERO Research Site 1
The only NERO research site in Iron Butte, beside a helicopter wreck across a gap from the southern Iron Butte ambush camp. A Nitrous bike jump gets you across. It only opens once Iron Butte does, after the Rippers fall.
Iron Butte Ranch Horde
A 300-Swarmer Horde at Iron Butte Ranch that you clear in Keep Them Safe, part of the push toward Wizard Island. It is the only Horde you ever fight in Iron Butte, and it shows up just for this mission.
Redwood RV Park Ambush Camp
Redwood RV Park Ambush Camp is a Ripper camp in an old RV park in Iron Butte. It only opens with the region late in the story and pays 2,500 XP plus Iron Mike's Trust and credits.