The mines reopened in 1915 due to World War I's increased demand for the molybdenum and vanadium found in the area. When the war was over, the prices fell, and the mines closed again in 1919. Shortly thereafter, the Mammoth Mine property was purchased by Sam Houghton, who renamed both the mine and the town after his college mascot, the Princeton Tiger.
The mines resumed operations in 1915 as a result of World War I's increased requirement for molybdenum and vanadium found in the area. Following the war's conclusion, prices declined, causing another closure of the mines in 1919. The Mammoth Mine property was subsequently acquired by Sam Houghton, who rechristened both the mine and town after his college's symbol, the Princeton Tiger.