Hill surveyed the surroundings... various alchemy items used in Luskan now carried a strong Undead Tribe imprint.
Most family gangs that came to Toril this time brought along some small alchemy workshops purchased from William. This was after they realized they would be staying in a world for a long time and strongly demanded William to open the purchase rights... After experiencing the previous few worlds, they were very clear on how unwise it was to buy basic alchemy supplies directly from the Temporal Artifact.
They could all gather their own materials; who didn't have some mining skills... Toril actually had quite a bit of basic minerals, the lack of many mines was because there wasn't enough power to secure them.
Who knows when a dragon might pass by your mine...
Moreover, their mining methods were too primitive, relying entirely on oppressing or deceiving the impoverished.
The Undead Tribe, however, used Earth Magic for prospecting and mining!