OCI Chemical Trona Mine, Wyoming

This is the northernmost of the four Trona mines and processing plants in the Green River deposit, and the smallest in output. Even so it is a large operation, employing 430 people (2015) and extracting 2.7 million metric tons annually. For years it was owned by OCI Enterprises Inc., a South Korean company, and was then owned by the Ciner Group of Istanbul, Turkey, which purchased it in 2015, for $429 million.