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 reopening of the mines in 1915 was triggered by World War I's increased demand for molybdenum and vanadium in the region. Following the war's end, prices fell, leading to another closure of the mines in 1919. The Mammoth Mine property was subsequently purchased by Sam Houghton, who rebranded both the mine and town with his college's name, the Princeton Tiger.