An item of interest is that the bandits appear to be trying to mine into the sewer system of Chorrol, but they have not completed the job. There is no way to open the gap to the sewers and nothing significant in the sewer system. Furthermore, the sewer system does not actually provide a passage into Chorrol.
The mine has many trip-wire traps, so watch out (the bandits appear to like to set off their own traps). There is also a small amount of loot.
There is also a small area that will collapse when entering a hallway. There is nothing in the collapsed room.