USGS presentation finds substantial lithium fluxes into Great Salt Lake, but key uncertainties remain

Scott Heenick, a hydrologist with the U.S. Geological Survey’s Utah Water Science Center, told the Great Salt Lake Tech Team that new sampling shows measurable lithium loads entering the lake and that conservative estimates indicate substantial annual fluxes.

Heenick presented about 700 new lithium concentration measurements from across the Great Salt Lake basin and said those data, paired with discharge measurements, yield a ‘‘mean load or flux of lithium [at Bear River, Corinne] is about 400 kilograms a day’’ — roughly 150 metric tons per year on an annualized basis. He described the estimate as conservative and dependent on choices about which parts of the hydrograph (baseflow versus runoff) to include.

Why it matters: lithium is concentrated in terminal basins such as Great Salt Lake, and new extraction technologies under study (including direct lithium extraction pilots) could change how much resource is removed or retained. Heenick emphasized large uncertainties in spatial sampling and temporal variability that complicate any simple ‘‘resource lifetime’’ calculation.

Heenick showed how mass load calculations combine…