-224, 82, 680, at the end of the NW past out of Costen
The Far Mines are your first break from the combat scene. Here one can mine Stone, Coal, Iron Ore, and Copper Ore in order to create strong new equipment. Additionally, the neutral Cave Dwellers can be found within the cave's depths.
-218 82 664, in the house directly North of the Far Mines entrance
Onyx is the most important NPC when it comes to mining. For one, she introduces you to it with her quest, and in addition, she has a full shop geared towards mining, with an entire reputation system built around it.