I report back with the following information: The mine is several hours away moving with the group. When returning with the stone it could take as much as a day.
There are several huts in a valley and a spot on the far hillside where it appears the men have been digging. I could not find a cave. The men are gathered in an outside of the hut, with guard watching. I counted five guards, armed the same way the others were. I did not see Zersisk. It appears the slaves are crowded in the huts but I couldn't get a good count of how many.