The principal physico-chemical characteristics of some thermomineral waters of Cabego d'Or aquifer are studied. The waters have a temperature between 27-38 °C and they are calcium-sulphate type. The high concentrations of sulphates, calcium, strontium and boron show a probably relationship with the dissolution of evaporitic salts. Two samples have a low nitrate contents and possibly results of mixing processes with cold waters. The minor undersaturated in sulphate salts of well number one shows a water movement through plus highly soluble materials. Conventional chemical geothermometers show a base temperatures around 75 BC