Modelování prostorové distribuce škodlivých prvků v rudním revíru Oloví pro vyhodnocení jejich environmentálních dopadů.

Abstract

This thesis is focused on the modeling of the distribution of harmful chemical elements – lead and zinc – to evaluate their environmental impacts in the Oloví historical ore district in Western Bohemia. The mining history of this district began in the 14th century and ended in the early 20th century. In this ore district two surveys were carried out in the 1950s – the first on radioactive minerals, the second one on prospection of Pb and Zn ores. The data used in this thesis is recorded in the Oloví final report which is stored in the archive of the Czech Geological Survey. New surveys were conducted in the Oloví district focusing on the assessment of the risks of abandoned mining waste sites after 2011. Six locations were ivestigated in the district. The thesis summarizes basic data on geology, hydrogeology, stability, geochemistry and environmental influences of studied ore distict. Archival data from metallometry were used for a modelling of the planar distribution of lead and zinc after correction and verification. Archive data from grooves and schafts was used for spatial modelling of Pb and Zn distribution after correction and verification. Voxler and Surfer software (Golden Software Packet) as well as SGeMS and GS+ softwares were used for modelling. A program called Oloví was created in the Visual Basic programming language to estimate the resource of Pb and Zn as well as to visualize the distribution of elements in horizontal and vertical sections. Four variants with different anisotropy ellipsoids and different sample selection ellipsoids were processed for resource estimation and then compared with the results from the last century. The variant 4 has been evaluated as the most probable from all of them. The thesis can serve as a methodology for surface polution modelling as well as a methodology for a preparation of an exploration target for a new prospections in the historical ore districts.