Kennecott Utah Copper

Company History: Kennecott Utah Copper LLC (KUC), a division of Rio Tinto Group, is a mining, smelting, and refining company. Its corporate headquarters are located in South Jordan, Utah, USA. Kennecott operates the Bingham Canyon Mine, one of the largest open-pit copper mines in the world in Bingham Canyon, Salt Lake County, Utah. The company was first formed in 1898 as the Boston Consolidated Mining Company. The Utah Copper Company was incorporated on 4 June 1903. The current corporation was formed in 1989 following its acquisition by Rio Tinto.

Its rolling stocking is using reporting marks KCCX, though simplified to KCC.

From Wikipedia

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