Scholarly record

EXAMINATION OF THE STABILITY OF THE ORIGINAL MINING WORKS, INCLUDING CARRYING OUT A GEOLOGICAL SURVEY OF THE MINING WORKS AND SELECTION OF A SUITABLE DEEP MINING METHOD OF THE KAMENNY VRCH DEPOSIT

Radim Lex

Abstract

The aim of the research is to examine the geotechnical stability of the historical mining works for the Kamenny Vrch deposit with a high percentage of limestone, including examination of the geology of the mining works for the selection of a suitable deep mining method. A complete inspection of the mining works was performed to examine the geotechnical condition of the mining works. Convergence measurements were carried out to determine the stability of individual parts of the mine. Further, a geological description of individual types of limestone and rocks through which the mine passes was carried out. At the same time, samples of individual rocks were taken and sent to a laboratory to determine the compressive strength and to perform a chemical analysis of individual limestones. Subsequently, the compressive strength point load was verified using a type N Schmidt hammer. For the subsequent selection of a suitable mining method, it was necessary to perform an analysis of individual rocks according to the RMR method – Rock Mass Rating. To examine the stability of the mining works, a convergence measurement was carried out which aimed to establish the stability of the mining works for their eventual use as access to the mining works of the Kamenny Vrch deposit for subsequent deep mining. The results of individual measurements pointed to the fact that the mining works are still stable, even 75 years after the end of mining. Lower stability was found in parts of the mining works, which, however, is negligible in terms of selecting a suitable mining method for deep mining of the Kamenny Vrch deposit. The obtained results will be further used to examine and select a suitable deep mining method for this deposit. A thorough geological analysis of the mining works supported by geotechnical survey methods resulted in a detailed mapping of the geological characteristics of the wider surroundings of the Kamenny Vrch deposit. Geomechanical monitoring verified the condition of the mining tunnels in limestones over the years and served to specify the possibilities of mining the Kamenny Vrch deposit. A detailed geological description revealed the occurrence of Pridoli limestones, which were not recorded by the surveys previously carried out. Pridoli limestones were not verified by a geological survey of limestone deposits in the vicinity of Morina in the 1950s, and at the same time they were also not found by a geological survey of the Kamenny Vrch deposit in 2015. This leads to a significantly more exact classification of the individual limestone layers of the Pridoli Formation in the vicinity of the Kamenny Vrch deposit as being from the highest Silurian.

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