The race for lithium extraction in America

Via the New York Times, an interesting article on lithium mining in the United States: 

Some of those investors are backing alternatives including a plan to extract lithium from briny water beneath California’s largest lake, the Salton Sea, about 600 miles south of the Lithium Americas site.

At the Salton Sea, investors plan to use specially coated beads to extract lithium salt from the hot liquid pumped up from an aquifer more than 4,000 feet below the surface. The self-contained systems will be connected to geothermal power plants generating emission-free electricity. And in the process, they hope to generate the revenue needed to restore the lake, which has been fouled by toxic runoff from area farms for decades.

Looks like they're using ion exchange beads for the extraction - makes sense.