Currently the largest known lithium deposit is in Bolivia’s salt...

Currently the largest known lithium deposit is in Bolivia’s salt flats, which are estimated to hold around 23 million metric tons of lithium. Study author and mining company Lithium Americas VP Tom Benson tells Mining.com that the Thacker Pass deposits are “right at the surface of the Earth, which makes it “one of the least impactful mines ever to be built.’” Benson’s company website says the Thacker Pass mine would go down a maximum of 122 meters; Midwest Lithium is drilling down into the rock near Mount Rushmore about 260 meters.