How To 

How To Beat Dry Rock Gulch In Fallout 4

As soon as you enter the Dry Rock Gulch you'll be given the quest 'High Noon at the Gulch'. You'll need to complete this in order to claim this area for one of the raider groups. To begin, you'll have to talk to one of the sheriff robots in the area, and they'll tell you to talk to three other different robots to help them out. You can bypass any of the quests these guys give you by passing a high speech check, or by having ranks in the robotics expert perk.

Step 1)Speak to the Giddyup Kid.
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The Giddyup Kid will ask you to track down his missing Giddyup Buttercup toy. This can be found shoved in a trash bin directly to the east, near the refreshment stand. Bring it back to him and drop it in the circle to collect the first piece of code.

Step 2)Challenge One Eyed Ike to a duel.
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When you talk to this robot, he'll challenge you to a duel and give you an old western revolver to use for the purposes of the duel. Equip it and when he yells draw, shoot him before he shoots you. That's all you'll need to do here to get his piece of the code.

Step 3)Bartend for Doc Phosphate.
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When you speak with the Doc, you'll be asked to help him serve a couple of customers. It seems the drinks have come a bit too late for these patrons, but drop them off at each skeleton's table. When you step outside afterwards you'll be attacked by several bloodworms. Dispatch them, and head back inside to get the third and last piece of code to open the safe.

Step 4)Eliminate the bloodworm queen.
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Now that you have the code, open the safe (which is located in a shack behind an anthill) to get the key to the mines and head in. Beware any dead brahmin you see in here, as they are more than likely infested with bloodworm larvae. Try to pick off the larvae before you alert the queen for an easier fight, but all in all this isn't too tough of a fight.

With the queen eliminated, head back to the sheriff's for your reward and to claim the area for a raider faction.