The hot spring issues from a 2.5 centimetre wide crevice, 1.8 metres long in granodiorite of the Late Cretaceous Butedale Pluton. It is above 45 degrees Celsius and consists of the following, in part per million: Cl-24, Na-81, SO4-174, Ca-22, HCO3-2, CO3-10, SiO3-59, FeO+Al2O3-23. Total dissolved solids are 395 parts per million.