Mining of the thick coal layers that include roof caving operation can results in residual coal quantities in the gob as a potential threat causing occurence of spontaneous oxidation process, smoldering, and endogenous mine fire that can affect the safety and regular mine operations. Endogeneous fire occurences in Zenica coal mines are directly linked to complex natural conditions reflecting in complex geological conditions, great depth of mining, high methane content in coal seams, and tendency of coal to spontaneous oxidation process. The subject of the paper is the analysis of endogenous fire supression method applyed in conditions of complete coal thickness longwall mining in Raspotočje mine, that has been rehabilitiated upon the endogeneous fire and then reactivated. The following methods were used in fire fighting: passive fire fighting methods (sealing of the area affected by the fire), active method (injection of electrofilter ash) and ventilation methods. Furthermore additional data (position of gob area and sealing objects, air flow regulators, routes of possible air migration, suggested technical solutions, etc) were added in the linear and canonic schemes for the purpose of defining efficient solutions for fire fighting. Key words: endogenous fire, longwall mining, advancing mining, fire fighting.

Due to properties as flammability, explosiveness, suffocation (decreased oxygen content), toxicity (incomplete combustion), large lengths of gas pipelines, risk of leakage, etc., natural gas is media that requires special care during transport and use. There are many examples in the world where unprofessional and negligent use of gas led to unimaginable and tragic consequences with human casualties and huge material damages. This paper analyzes management of accidental situations at the Sarajevo Canton gas system. Problematic aspects of management will be presented through two case studies instead of presenting idealized models that integrate all structures responsible for dealing with such accidental situations. The methodological approach in this paper is presented through selection of accidents on gas network that had a significant impact and required a coordinated response from the competent services. The goal is to consider possibilities of improving technical measures by installing valves with remote control, which would raise safety to a higher level. With this step forward in technical terms, it would be possible to close the valve on gas system in the shortest period of time by controlling it from the dispatch center, which would stop the uncontrolled gas release. The paper will suggest locations where it would be optimal to install valves with remote control, in order to close the necessary section, and at the same time, the least number of consumers would have a gas supply interruption. Key words: gas system, accident, technical measures

Brown coal mining conducted at greater depths, characterised with severe mining-geological conditions often results in deviation from the applied mining methods. Experiences gained in mechanised longwall mining of roof plate in deeper parts of Raspotočje mine, using method of roof caving without safety pillars left behind the working panels indicates to shortcomings of the applying mining method. Frequent occurences of spontaneous mine fires, of hazardous gasses well above the limit values, and constant exposure to rock bursts of various in- tensity resulted in application of three longwall face ventilation regimes: conventional „U“ ventilation system, ventilation with gas channel and middle hallway, and separate ventilation of the upper part of the longwall face. This paper presents experience based information gained in a five years period of mining, analysed using one- factor and two factor regression analyses applied to a number of technical-technological parameters (ventilation, mining system, etc) influencing occurences of spontaneous mine fires and increased gas release in various ventilation regimes at longwall face aimed to give basic guidelines for minimisation and elimination of certain hazards. Keywords: ventilation regime, spontaneous fires, gas release, mechanised longwall.

Power plants, such as coal boilers, emit flue gases containing solid particles and gases resulting from the combustion of coal. One of the most dangerous pollutants emitted is certainly sulfur dioxide. Therefore, the reduction of emissions of sulfur dioxide has become a legal obligation. So far the most successful method of reducing the content of sulfur dioxide in the combustion products leaving the environment is injecting limestone or lime in combustion and to provide conditions for the reaction between the injected lime and sulfur dioxide from combustion products still in the combustion chamber. This method has been successfully used in thermal power plants to coal. This paper deals with the possibility of introducing the process of dry flue gas desulphurization created during coal combustion in boilers of smaller.

The paper presents the potential areas in Bosnia and Herzegovina (BiH) for injecting  CO 2 into underground geological formations by boreholes. Areas are determined based on the geological structure of Bosnia ana Herzegovina, and development of Miocene formations which are the most prevalent in the northern and northeastern parts of the country, in the central part of country and southwest of Bosnia and Herzegovina. Furthermore paper gives an overview of  potentials for injecting CO 2 into abandoned coal mines, and abandoned salt mine.

Geophysical explorations enable determination of causes to damage or inflicted injuries, understanding of initiation mechanism of accident and proofing of hypothesis beyond reasonable doubt in court proceedings thus leading to material evidence that will either confirm or deny initial hypothesis. Mining operations in Lipnica underground mine were conducted for about 50 years and were stopped at the begging of the war in 1992. Main openings of the mine, as well as the former mining panels in roof coal seam, are located directly under the settlement Lipnica. After more than two decades of mine closure a number of court proceedings are still pending. It concerns claims for compensation of evident damages inflicted on houses. Conventional calculation methods of subsidence dynamics and time frame of consolidation process that were defined in planning of mining operations and previous forensic investigation were mainly stressing the fact that the giving time distance is to long to expect effects of mining operations. The paper gives overview of a comparative analysis of mining-geological conditions and geophysical explorations in the case of forensic investigation into damages inflicted of houses, including analysis of possibilities to apply geophysical forensics in investigation of underground mining operations impacts.