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Harmony Borax Works at Furnace Creek Springs. Deposits discovered and exploited in this area opened the way for "large-scale" borax mining in Death Valley. The Harmony operation became famous through the use, from 1883 to 1889, of large Twenty-mule teams and double wagons that hauled borax the 165 mile (275 km) route to the closest railroad in Mojave, California. National Register of Historic Places on December 31, 1974. Death Valley National Monument Est. February 11, 1933. Est. as Death Valley National Park in 1994; 5,270 square miles (13,649 km2). Inyo County, CA.