The reassessment of reserves of mineral water mines is an interesting problem for hydrogeologists and production enterprises. For solving this it is necessary to carry out the test pumping and test exploitation for mineral mines which are being exploited in small scale.

The test pumping with one time or three times of lowering of water level is decided by the complex level of hydrogeological and hydrochemical conditions of the mine, as well as by the predicted method of reserve calculation.

The test exploitation is usually carried out during the enlarged investigation and reassessment of reserve of the mine. The authors suggest advices and regulations of test pumping and test exploitation. The results of test pumping form the basis of argumentation of industrial reserves, as for those of test exploitation they form the basis of argumentation of perspective reserves. The test pumping and test exploitation for reassessing the reserves of the Thanh Thñy mineral water mine, Phó Thä Province, are presented as example.