Is California on the Verge of a Second Gold Rush?
This piece was originally published by Undark.On the outskirts of the Northern California town of Grass Valley, a massive concrete silo looms over the weeds and crumbling pavement. Nearby, unseen, a mine shaft drops 3,400 feet into the earth. These are the remains of Grass Valley’s Idaho-Maryland Mine, a relic from the town’s gold-mining past.


























