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Abstract
The thermal springs are situated 18 miles west-north-west of the town of Nylstroom on the farm Middelfontein and issue from intensely folded sandstones belonging to the Waterberg system. There are seven main sources, having a combined discharge of 414,300 gallons per 24 hours. In the orifices the temperatures range from 27·1° C. to 34–1°C.
Chemical analyses show that the water is only weakly mineralised, the chief constituents being Ca and HCO3'. All the springs are gassy, the gas from one proving to be atmospheric air deficient in O2 but rich in CO2.
A line of cold springs occurs 1½ miles north-east of the warm springs, and the geological evidence indicates that both groups are of meteoric origin.
The local inhabitants believe that the thermal waters possess remarkable healing properties.