The area is underlain by quartz diorite of the Cretaceous to Tertiary Ecstall pluton. The hot springs flow at 915 litres per minute, are 38.0 to 46.0 degrees Celsius and have a pH from 7.66 to 7.86. They have a slight gas discharge. Analysis of the water gave the following results, in "grains per gallon": total solids 64, chlorine 1.7, sulphur 11.2, and sodium chloride 44.8 (Minister of Mines Annual Report 1901).