The term Gutters had different meanings in the city of Bothal.
Before industrialization, the Gutters were the name of the cave systems where the outcasts lived.
People with no skill and only good for mining. To them, the mines were their home, even if these mines brought them death due to the lack of fresh air.
The dwarves that lived here were at the bottom rung of society most of the time, some were criminals who came looking for safety, some were just unskilled labor without a place to stay, some were kicked out of their tribes and then there were the opportunist that came here to look for leftovers.
Veins of ores that were left behind by the dwarven tribes. And from time to time, some of them might get lucky, striking it rich. Before they were killed by their companions.