Caka Salt Lake belongs to structural lake, which is formed by the uplift of Neotectonics in the ancient fourth season. Qinghai was a vast sea as far back as 2.3 billion years ago. Later, with the rise of the earth's crust, many Inter-mountain basins formed in the Caka area in the northeast of the Qinghai Tibet Plateau, forcing the surface water to radiate centripetally, forming lakes and accepting sediments. On the other hand, due to dry climate, windy and rainless climate, and large amount of evaporation of sea water, the salt collected in the lake quickly concentrated to form salt deposits, and finally evolved into a salt lake, which has a history of 60 million years, so "Green Salt" is a deposit from the Qinghai Tibet Plateau of 60 million years.
Caka Salt Lake is a mixed lake with both solid and liquid. The halite ore body occurs in layers in the upper part of the Quaternary brand-new system, directly exposed to the surface. The lake water belongs to sodium salt type, and the content of sodium chloride is 94%. It is a kind of edible salt. It is called "Green Salt" because it contains trace black impurities and its color is dark white. The reserves of rock salt in the lake are 44.8 billion tons, which can be used by the whole country for 80 years. The salt cover is thick, directly exposed to the surface, and distributed in the shape of a pot bottom. Its thickness is generally 1.2-9.67 meters, the thickest part is 15 meters, and the average thickness is 49 meters. The thickness of the ores changes with the topography of the basin base. Generally speaking, it is thick in the middle of the lake, and gradually decreases around. Green Salt grain is large, pure in quality, cubic crystal shape is intact and transparent, taste is good. It has the characteristics of simple mining, high edible value, and the cooked dishes are delicious in color, sweet-smelling and flavor. Pickles, which use by Green Salt, are also durable for thousands of years, and have been loved by people of all ethnic groups in Northwest China.