Salt was discovered in Reno County by Benjamin Blanchard on September 26, 1887.[4] This gave rise to the first salt-processing plants west of the Mississippi River. Salt was originally extracted using the evaporation method by pumping water into brine wells. In 1923, the Carey Salt Company opened the first and only salt mine in Hutchinson, which then produced rock salt. That mine is still in use today and is now operated by Hutchinson Salt Company. Cargill and Morton also have evaporative salt plants in Hutchinson.
Excavated portions of the mine are used for archival storage of movie and television masters, data tapes, and permanent business records. Underground Vaults & Storage currently houses the masters for The Wizard of Oz (1939), Gone with the Wind (1939), and Star Wars, (1977) among many others.[5]