The Herzog mining site was named after an old man named Herzog, the owner of the mining site who put the miners through poor working conditions. If you talk to Kenny who lives in the mine, he states that one day the workers just stopped working and sat down, probably referring to a strike. Herzog wasn't very happy when he heard about what they were doing so he blew up the entire site with a "million million tons" (may be referring to a nuclear device, as those are measured by tons of TNT equivalent, although this is unlikely due to the relatively small amount of damage to the mine) of dynamite according to Kenny. Kenny's exaggeration here is apparent, but there is a large amount of collapsed rock with many skeletons visible inside showing signs of an explosion and subsequent cave-in. After he detonated his explosives, Kenny says that old man Herzog hung himself.
Herzog Mine is set into the rock cliffs south of the Ark & Dove Resting Grounds. It can be accessed by a path down the rocks from the top of the cliff, or by climbing up to it from the beach below. It consists of a small cave entrance with some rubbish around.
The mine is a set of tunnels winding into the cliffside. Various branches of the mine have collapsed, due to explosives set off before the great war. Kenny is the mine's only inhabitant, and has set up numerous traps to make the mine seem haunted. Eventually, by winding through the passages you will come across Kenny's Cave.
If you enter the last area of the mining site, you can see a skeleton with a rope around its neck. The skeleton is presumably Herzog, and is found with the skeletons of the workers he killed.
The mine has some unique traps set up by Kenny, including a "rockslide" composed of doll heads and a flashing camera.
Sometimes when entering the mine the player might encounter the body of John Adlam. His body holds a holotape which tells the player why he was killed, but the first time you approach the cliff you can actually see his execution. Sometimes you get to see it twice, once going into the mine and once while you leave.
In Blackdamp Shaft, in a northern section near a cluster of mirelurk egg clutches and very close to glowing mushrooms, is a small pit into which the player can fall. There's no jumping out of there once inside.