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The world’s richest known lithium deposit lies deep in the woods of western Maine, in a yawning, sparkling mouth of white and brown rocks that looks like a landslide carved into the side of Plumbago Mountain.Mary Freeman and her husband Gary found the deposit five years ago while hunting for tourmaline, a striking, multi-colored gemstone found in the region....But like just about everywhere in the U.S. where new mines have been proposed, there is strong opposition here. Maine has some of the strictest mining and water quality standards in the country, and prohibits digging for metals in open pits larger than three acres. There have not been any active metal mines in the state for decades, and no company has applied for a permit since a particularly strict law passed in 2017. As more companies begin prospecting in Maine and searching for sizable nickel, copper, and silver deposits, towns are beginning to pass their own bans on industrial mining.