One of the stages in Gloomwood are the mines in the Coast Caves area, which contain keys unlocking new passages. Finding them will let you fully explore the location. Our guide lists the keys' locations and where can they be used.
Mines Generator Key
You'll find this key early into the caves. Reach the first Phonograph. The key is on the table right next to the device.
It unlocks the previously locked Generator Room. Using this key and turning off the generator is mandatory, as this is the only way to get past the electrified gate in the first cavern.
Mines Storage Key
Unlike the previous, mandatory key, acquiring this one is fully optional.
You can find it while making your way through the area filled with mutated dogs. You must reach the cave shown in picture 1. After killing the dogs find the corpse shown in picture 2, next to which is the key.
Now look for the side path nearby, which leads to a locked door. Use the key there to unlock a loot stash.