The hot spring issues at 264 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-4600, Na-2523, SiO2-38, SO4-717, Mg-179, Ca-385, K-82, HCO3-58, FeO+Al2O3-58. Total dissolved solids are 8640 parts per million. Contamination of the meteoric water by sea water is likely.