| Summary: | Towns are of particular interest to geography which examines them in various objective and theoretical aspects. The concept of function is associated with the role which a particular town plays in the area, and this function is the entirety of socio-economic activity carried out in the town. The concept of the economic base of towns, which is used in this paper, distinguishes two groups of town inhabitants, namely such whose work directly contributes to the development of the town, the so-called primary builders (exogenous), and secondary builders (endogenous) who support the first group. This article presents the results of the study of changes in the function of 30 towns in the Silesian voivodeship in which coal mining is still carried out or has ended (18 mining towns and 12 post-mining towns). These towns have different sizes: small ones (up to 20,000 inhabitants; n=6), medium (20 to 100 thousand inhabitants; n=15), and large (with population of over 100,000 inhabitants; n=9). The study was conducted with the use of the indirect measurement of economic base method based on the location ratio, but in a modified form - i.e. the employee surplus rate. The analysis of functional changes in the mining towns of the Silesian voivodeship was performed in five aspects, in relation to: 1) the opening of the economy indicator, with the use of data concerning employment in the exogenous and endogenous group; 2) the employee surplus rate, determining the functional type of towns according to the dominant PKD [Polish Classification of Business Activities] section on the basis of the exogenous group; 3) the structure of exogenous functions of towns; 4) change of the exogenous function of towns; 5) the employee surplus rate, determining the share of section C (mining) in the exogenous function of towns. The analysis showed that in the period of 1996-2009 there has been a change in the functional type, from industrial to service type, in 8 towns; however, mining is still the primary branch of business activity in 11 towns studied, especially in small ones. Today, many service-based towns specialise in trade (n=7), and a small group of towns specialises in non-market services (n=4), which shows that the process of changes in this respect is still ongoing and the towns studied cannot be regarded as towns having a substantial share of higher-order services.
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