Most hikers on the AT do not know that that the area of Western Maine that the AT crosses is near an area of significant precious and semiprecious gem deposits. There is new gem museum in Bethel that displays samples. Turns out that there also is deposit of mineral Lithium deposits. Plumbago Mountain is south of Moody and Hall mountains and southeast of the Baldpates. The east side of the Grafton Loop trail is just west of the mountain.
https://bangordailynews.com/2021/10/...ed-near-newry/
Newry has no real town center, Sunday River Ski area is on the southern end of it. The closest road access would be Andover Me. No doubt if the mine is developed it will change that area significantly.