The title says it all. The Bellegarde Mines in Dementlieu are effectively a pointless fixture. The materials within the mine are too low level to justify the high difficulty mobs inside of it. If the mobs are so strong because Dementlieu is supposed to be a higher CR domain, then it would stand to reason that the materials should be better anyway. Conversely, if the materials are lower level for the sake of accessibility, then the mobs should be nerfed to fit the reward. As it is now the design comes across as pretty confused, and the cave is almost entirely ignored, to the point that it's only function in game centers around the fact that it is never visited.