The Gabbs Valley playa is considered to be a viable prospect for subsurface lithium brines for the following reasons: (1) it is a deep, closed basin in a dry, desert environment, (2) geothermal activity is known to occur on all sides of the playa, including the south end where the operating Don Campbell geothermal power plant is located, and (3) potential lithium source rocks are found throughout much of the catchment basin.