Collector Pippy:
The mine used to be a vast expanse consisting of the hundreads of tunnels, but most of them were destroyed after the attack of the Earth Wyrm and the Mithril is collected from very few tunnels now.
Currently, our guild is working to restore destroyed tunnels and greatly increase the output of the Mithril. This plan has been delayed, though, because our timid elders are afraid that the Earth Wyrm might regain consiousness.
Maybe it's because they are old, but they are all cowards. Pippi could take care of that ole Wyrm with one fist!