Abstracts

Cuprum Ore Mining Scientific and Technical Magazine Vol. 61, No. 4, 2011

Rockburst hazard evaluation and prevention methods in Polish copper mines (eng.)

Prof. Jan Butra, Ph.D. Eng. Jan Kudełko,

Longstanding mining of copper deposit in the Legnica-Glogow Mining Basin (LGOM area) enabled to gain broad experience concerning the impact of geological and mining conditions on seismic and rockburst hazard. Basing on gathered data, the methods of rockburst prevention for deep copper mines were developed. Methods of rockburst hazard evaluation as well as rockburst control methods constitute a set of rockburst prevention. The prevention methods due to their nature and location within the production process can be the passive and the active ones. Active methods of rockburst prevention consist in liquidation of stresses in the areas of their concentration through controlled generation of rock-mass tremors and rockburst by blasting works (group winning blasting, release blasting in rock-mass and in pillars able to accumulate the stress as well as in the roof and floor). Whereas the group blasting works as a basic method are very effective in the copper mines conditions. Provocation of dynamic events makes possible the control of time of their occurrence. In Polish copper mines all blasting works are made during the absence of miners in the mining fields. Daily distribution of both the number of recorded strong seismic events and the volume of energy released confirm the advisability of using this kind of rockburst hazard prevention. The rockburst hazard prevention methods developed during the 40 years of copper deposit extraction are economically reasonable and offer the sufficient effectiveness under the high rockburst hazard conditions.

 

Legal and environmental aspects of using refrigerants for air conditioning of underground mines (pol.)

Dr Eng. Slawomir Gajosinski, M.Sc. Eng. Magdalena Jankowska-Groch

The classification of refrigerants with regard to the chemical structure and their influence on the environment is presented. The properties of refrigerants used in mining cooling units are characterised as well. Regulations connected with using different kind of refrigerants in new installations and during maintenance of existing units are described. Regulations generally concern the influence of cooling refrigerants on the environment: degradation of ozone layer and causing the greenhouse effect. Current trends for using new refrigerants, especially taking into consideration the possibility of their application in mining cooling units are presented in the paper. 

 

The analysis and improvement of underground excavations stability in the light of in-situ stress field (pol.)

Dr Eng. Daniel Pawelus, Prof. dr hab. inż. Jan Butra

This paper presents the effect of intensive horizontal stress on underground excavations stability. It describes the protection methods of excavations stability improvement. These methods are used in the world mining. 

 

„Śląska Sztolnia Szczęśliwa" in Gierczyn as a material testimony of technical problems of ore mining in 18th century and technical monument requiring protection (pol.)

Dr Eng. Maciej Madziarz

The history of unfinished construction and remains of deep drainage adit in tin ore mine „Hundsrucken" in Gierczyn is presented. Old mining works in this region are described. In this paper the fundamental role of adits in old mining works, the principles of their building and relics of old excavations located on the territory of Poland are described.