Undercity, Marketplace, Cavern at the Tarpit
Tarpit is the main excavation site, where industrious miners are devoted to their monotonous and ceasless trade of extracting various ores. Once you have entered the mine, take notice of a huge platform and a lever nearby. Pull the lever and it will lead you to the level below.
There is an upper and lower part of the Tarpit. The lower one, however, is accessible only through Tarpit Bedders.
The Blind Miner is in the Tarpid, but you need to go through Tarpit Bedders to reach him.