a priori determining of the accuracy of mineral resources volume determination introduction -methods of measuring surfaces for the purpose of calculating volumesThe methods of measuring surfaces for the purpose of the subsequent determination of the volume of excavated or layered rock are as follows.1. Methods based on the estimation and experience of the mining surveyor -only for minor open cast mine mines. 2. Methods based on the summation of units (weight or volume) transported from the quarry area. 3. Methods based on the measurement of the rock volume "on the conveyor belt", usually using the profile scanning and determining the speed of the belt movement or by determining the weight of the rock on the conveyor belt. 4. Methods based on the geodetic measurements of the discrete points and shapes of the excavated material and comparing the subsequently created digital model with the model of the previous phase of the measurement.

The article describes mine survey works during opening old St. Anthony of Padua water adit in Horní Město (Czech Republic) to make it accessible to visitors. The works cover the connecting survey and orientation measurement, traverse measurement of the first opened part, setting-out projection of the end of opened part to the surface to make shaft from the surface, new connecting survey and orientation measurement by shaft and traverse measurement of the rest of water adit. Non-standard aids and techniques were used during surveying. One of the tools is a suspended prism holder developed at Institute of geodesy and mine surveying, VSB -Technical university of Ostrava, registered as a utility patent.