The hot spring issues at 60 litres per minute from a crevice in granodiorite of the Late Cretaceous Butedale Pluton. It is over 45 degrees Celsius and consists of the following, in parts per million: Cl-32, Na-92, SO4-179, Ca-18, HCO3-4, CO3-7, SiO2-62. Total dissolved solids are 402 parts per million.