Multicriteria model for application of underground gasification in coal deposites in Macedonia

With the increasing need for energy, both in quantitative and qualitative terms increasingly demands that natural energy raw materials are used techno - economically and in environmentally optimal way. This should be especially popular in our country does not have sufficient and structurally favorable supplies of energy raw materials. In this paper the aim is to introduce and implement new unconventional method of coal exploitation in order to minimize the emission of harmful gases. Specifically it comes to underground gasification of coal which is still a new and developing technology

Measuring the seismic effects of a querry for marble

In the querry for white marble "Sivec", where the research was carried out during normal exploitation, in the zones where digging is done, marble masses appear, which are broken down, not quality, and they need to be quickly removed. Drilling and mining operations are applied using certain quantities of explosives. In this application there is a danger of damaging the quality marble masses that are located around the blasting zone. This paper is actually a continuation of the paper from the same authors regarding the seismic effects from blasting in surface mines

Defining the sliding plane in micro plan on rocky massif using geoelectrical method

The paper presents data from geoelectrical measurements of micro locations where there is a sliding rock mass. These studies have been conducted on location mountain Plackovica in the Eastern Macedonian zone. The observations were performed with an interval of two years. Method geoelectrical sounding was conducted. Measurements are performed multiple times on the same profile, in order to define the sliding plane, depending on the weather. From the data obtained from geoelectrical sounding it can be concluded that the specific electrical resistance of the rock masses decreases at a time of increased amount of rainfall. During dry periods of the year occur relatively high values of the specific resistance, especially in the surface layer. This phenomenon is normal to expect. The analysis of the specific electrical resistance in the investigated profile clearly indicates that the plane of the sliding rock masses characterized by reduced specific resistance in relation to the surrounding rock mass, especially in extremely wet weather. In these conditions comes to the intense activation of the process of sliding rock masses. The results obtained are consistent with the basic theoretical assumptions, i.e. the zone with increased amounts of water has a lower value of the intensity of the specific electrical resistance, although it is the same type of geological environment. The results of these studies indicate that geoelectrical methods can provide useful information when investigating the sliding plane in rock mass

Работни услови при процесот на подземна гасификација на јаглен

Истражувањата покажале дека условите за работа при процесот на подземна гасификација на јаглени кои имаат најголемо влијание врз стапката на растот на шуплината се температурата, приливот на вода, притисокот и составот гас во подземнита гасификација на јаглен. Овде се презентирани, ефектите од условите за работа и јагленовите својства, поточно, јагленовата реактивност, работниот притисок, загубата на топлина, како и видот на оксидантот којшто се користи

Фрагментација на карпи – моделирање на проценка пред и по минирање

Овој труд има за цел да направи пристап кон дефинирање на методологија за проценка на фрагментација на карпи пред и по минирање. Пред да се изврши минирањето, мерењето на сеизмичките брзини во просторот каде се планира да се изведе минирањето, дава податоци за структурно – тектонските карактеристики на опфатените карпи, нивната компактност и сл. По минирањето, визуелниот мониторинг преку изработка на модели на одминирани маси со користење на софтвери за проценка на гранулометрискиот состав дава конкретна проценка на фрагментацијата од минирањето. Токму овие две мерења и анализа можат да бидат предмет за истражувања поврзани со моделирање на фрагментации, односно можност за добивање на оптимална гранулација на одминирани карпи

Обем на истражните геомеханички работи и носивоста на почвите според Еврокод 7 (ec7)

Во овој труд презентирана е методологија за обемот на истражните геомеханички работи и носивоста на почвите според Еврокод 7. Притоа демонстриран е начинот на дефинирање на геомеханичките истражни работи, како што се: бројот, распоредот и длабочината на истражните работи за различни типови на градежни објекти и прикажан е начинот на пресметување на носивоста на почвите во дренирани и недренирани услови

Synchronization of overburden dumping in Bucim open pit mine in function of minimal costs

Overburden exploatation in open pit “Bucim” is performed from 3 (three) ore bodies, with least 2 (two) excavating zone. Overburden dumping is in 3 dump: two external and one internal. The need for synchronization of work is imminent, given that it is the same transport machinery - 12 trucks. In this paper it was made an attempt for mathematical modeling of synchronization of transporting and overburden dumping in three dumps

Geomechanical characteristics of the tailing dam "Topolnica"

The tailing dam "Topolnica“ is a storage type because it has a dual purpose, that is used for the disposal of tailings flotation in the space of a river bed and it accumulate fluid flow water from the river Topolnica which serving open pit mine with drinking water. First projected elevation was 610 m above sea level, it has long been exceeded and reached final height of 90 meters. In the last couple of years, when the elevation of the tailing dam arid approached to the final projected elevation, the open pit mine approached to develop technical documentation for the same elevation. It was made a additional project for elevation to the upstream slope for 20 meters, elevation 630 m. In 2006 it was made second additional project for elevation of the upstream slope for another 24 meters, elevation 654 m and a total height of the crown of 136 meters. With the implementation of a additional project for tailing dam it is numbered as a highest dams in Europe

Exploatation technology of travertine blocks in "Golubova pestera" querry, s. Beseste - Prilep

Abstract: In this paper, will be presented method and the equipment for the exploitation of travertine at the “Golubova pestera” site, near the village of Manastir, municipality of Prilep. With main mining project foresees three fields of travertine excavation in which work is done with the same equipment and the same method in the three different areas. Keywords: travertine, cutting, splitting, commercial blocks, lamella

Geomagnetic research of the archaeological site Isar Marvinci, Republic of North Macedonia

In this paper the results of the geophysical investigation on the archeological site Isar-Marvinci are presented. The results show low changes in the magnetic field and the local gradient, as it is an archeological site where there are no buildings and structures built of baked bricks that cause larger magnetic changes in the magnetic field over 100 [nT] or more [nT]. Small anomalies of the magnetic gradient probably indicate graves that have been confirmed by illegal diggers, whose presence can be seen on the ground