Salt, magnesium chloride, sodium sulfate, potash, and lithium are all part of the Great Salt Lake. It is a natural repository for minerals. The ground and surface waters that feed the lake add about two million tons of dissolved solids to the lake each year. The billions of tons of solids found in the lake brine and the salt flats along the shore make the Great Salt Lake the site of the largest mineral deposits in Utah. An excerpt from the 22-part video series The Geography of Utah, conceived and written by Albert L. Fisher, PhD of the University of Utah.