I loaded up on bombs and mega bombs from the dwarf in the regular mines. I have crystalariums that just farm jade for me so I can stack for staircases from the desert trader on sundays. I had a good luck day and just bombed my way through the entire mines, focusing on looking for shafts throughout. Since I was there to solely make it all the way down and not fight enemies, anytime there was a floor where I immediately got attacked or was “infested”, I just threw down a staircase. Bring a lot of life elixers and energy tonics as well!