The Headstone mine is where you fight Sledge and get the second vault key.
Two missions takes place here:
Battle For the Badlands-Kill Sledge-Take Vault Key
Schemin' That Sabotage-Plant Explosives
The Headstone Mine is like a bandit sanctuary so there are a lot of bandits.
There is a hidden red chest here but it isn't very easy to get to.
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