Particularly in Australia companies do mine pegmatite for lithium, but digging and blasting that hard rock out of the ground and breaking it down into usable lithium is expensive, at least compared with lithium production from brines. In certain geologically anomalous spots around the world, there are large salt flats that are saturated with water rich in lithium and other minerals. Extracting lithium from the right kind of salt flat is a cheap and low-impact matter of pumping lithium-rich water from the flat into a series of evaporation ponds, where it bakes in the sun until it is concentrated into an oily yellow solution of 6 percent lithium. Currently, two of the three largest lithium producers in the world get their supply from a single salt flat in northern Chile, the Salar de Atacama. Across the border in Bolivia is the much larger Salar de Uyuni, which is loaded with lithium but which, for political and technical reasons, is still at least a few years from sending lithium to the market.