ISSN 1454-9174 ANNALS OF THE UNIVERSITY OF PETROSANI MINING ENGINEERING vol. 14 (XLI) UNIVERSITAS PUBLISHING HOUSE Petroşani – ROMÂNIA, 2013 _______________________________________________________________ISSN 1454-9174 EDITOR OF PUBLICATION _____________________Prof.dr.eng, Ioan – Lucian BOLUNDUT_____________________ ADVISORY AND EDITORIAL BOARD OF MINING ENGGINEERING ISSUES ADVISORY BOARD Prof. PhD. Eng. Victor ARAD University of Petroşani Prof. PhD. Eng. Andrei KORCEAK Moscow State Mining University Russia Prof. PhD. Eng. Lev Alexandrovich PUCHKOV Moscow State Mining University Russia Prof. PhD. Eng. Victor HARCENKO Moscow State Mining University Russia Prof. PhD. Eng. Vladimir LITVINENCO Moscow State Institute-Sankt Petersburg Russia Prof. PhD. Eng. Raimondo CICCU University of Cagliari - Italy Prof. PhD. Eng. Carsten DREBENSTEDT Technische Universitat Bergakademie Freiberg - Germany Conf.dr.ing. Ventzislav IVANOV University of Mining and Geology – Sofia - Bulgaria Prof. PhD. Eng. Zacharis AGIOTANTIS Technical University of Crete - Greece Prof. PhD. Eng. Sukumar BANDOPADHYAY University of Alaska – Fairbanks, S.U.A Prof. PhD. Eng. Hani MITRI McGill University – Montreal, Canada Prof. PhD. Eng. Gheorghe MORARU Universitatea Tehnică a Moldovei – Chişinău, Moldova PhD.Eng. Raj SINGHAL Int. Journal of Mining, Reclamation and Environment - Canada Prof. PhD. Eng. Işik YILMAZ Cumhuriyet University – Istambul, Turcia Prof. PhD. Eng. Ingo VALMA Tallin University of Technology - Estonia EDITORIAL BOARD Editor-in-chief: Prof. PhD. Eng. Ilie ONICA University of Petroşani Assciate editors: Prof. PhD. Eng. Viorel VOIN University of Petroşani Prof. PhD. Eng. Dumitru FODOR University of Petroşani Prof. PhD. Eng. Mircea GEORGESCU University of Petroşani Prof. PhD. Eng. Ioan DUMITRESCU University of Petroşani Assoc. Prof. PhD. Eng. Ioel VEREŞ University of Petroşani Assoc. Prof. PhD. Eng. C. BĂDULESCU University of Petroşani Assoc. Prof. PhD. Eng. Tudor GOLDAN University of Petroşani Editor Secretary: Lecturer PhD. Eng. Emilia DUNCA University of Petroşani Assist. Prof. PhD. Eng. Daniela CIOLEA University of Petroşani Editorial office address: University of Petrosani, 20 University Street, 332006, Petrosani, Romania, Phone: (40) 254/54.29.94, 54.25.80, 54.25.81, 54.25.82, 54.97.49, Fax. (40) 254/54.34.91, 54.62.38, www.upet.ro, E-mail: [email protected] Annals of the University of Petroşani, Mining Engineering, 14 (2013) 3 CUPRINS V. PLEEA, S.M. RADU - Competitiveness in energy production through hard coal exploitation retrofitting in mines belonging to Hunedoara energy complex…………….7 V. MIHĂILESCU, I. ONICA, E. COZMA - Dynamic of the technical and economic indicators of the Jiu Valley coal basin mines……………………………………………………….15 I. ONICA, E. COZMA, V. MIHĂILESCU - Improvement of the mechanized mining methods with surrounding rocks caving in horizontal slices, in the case of coal seam no.3 from the Jiu Valley coal basin…………………………………………………………………….23 M. TODERAŞ - Rock characteristics of Cetate Quarry perimeter from Rosia Montana……...31 M. POSTOLACHE - The physical feature of the debris fragments from Jiu Valley’s area…...41 I.C. PREDOIU - Dimensioning the coal faces in the used technological criterion from Oltenia’s lignite coal pits…………………………………………………………………………..47 F. BUŞE, G.F. BUŞE - Considerations regarding the methodology to determine the production capacity of complex mechanized stopes with long front………………………………...58 N. DIMA, I. VERE, L.O. FILIP - Surveying and geodetic network development method eliminate leveling Hubs……………………………………………………………….…71 E.G. BIBER, I.N. TIUZBAIAN, L. HULEA - Precious metals stocks investments. Theoretical grounds…………………………………………………………………………………..75 G. BUIA, C. LORINŢ, R. LUPULEAC - Aspects on economic potential of Jiu Valley coals……………………………………………………………………………………..81 C.D. CRIŞAN, I. CONŢ, T. VASIU - Influence on emissions from soil thermal power Deva – Mintia……………………………………………………………………………………89 G.L. DOBREI, I. CONŢ, T. VASIU - The maintenance of the hydrotechnical system in terms of environmental protection at Mintia TPP………………………………………………..97 G.L. DOBREI, C. VRÂNCEANU, I. CONŢ, T. VASIU - Practical measures of environmental pollution reduction within Complexul Energetic Hunedoara S.A. – ELECTROCENTRALE Deva…………………………………………………………..109 K.G. FISSGUS, R. MUNTEANU - The difference between the WGS84 and the ETRS89 coordinate reference systems…………………………………………………………..119 4 Annals of the University of Petroşani, Mining Engineering, 14 (2013) L.O. FILIP - General theory of processing the measurements size…………………………..123 M. LAZĂR, F. FAUR - Identification and assessment of the risk and impact generated by Roşia Poieni Quarry and Dealul Piciorului processing plant…………………………129 M. LAZĂR, V.V. SANDU - Risk of acid rain production, due to the emissions generated by the thermal power plant Paroşeni…………………………………………………………144 C. VRÂNCEANU, D. MARCHIŞ, R. SÂRBU - Technological option for the recovery of the coal fraction from flotation tailings stored in ponds…………………………………..153 R.I. MORARU, M. POPESCU STELEA - Inconvénients et pièges en évaluation des risques professionnels: exemples en Roumanie………………………………………………..157 R. MUNTEANU, K.G. FISSGUS - The hotelling rule and its use in the Romanian mining industry………………………………………………………………………………...167 D. FODOR, A.C. SMEU - Reintroducing the internal waste dump Tismana in the agricultural circuit…………………………………………………………………………………..171 A.N. SEMEN - Sources of pollution of the surface hydrografic system and the underground water in the Jiu Valley mining district (Valea Jiului-Romania)……………………….187 R.V. VINTER (ZAHARIA), C. ZAHARIA - Study on ecosystem restoration on degraded terrains by coal mining in Câmpu lui Neag Quarry - e area…………………………..193 C. ZAHARIA, R.V. VINTER (ZAHARIA) - Recovery and capitalization solutions for the land from Poiana Mare, Șesul Șerbanilor and Galbena waste dumps, from Câmpu lui Neag area……………………………………………………………………………………209 V.V. SANDU, M. LAZĂR - Research on potential acidification of soils, due to acid rains, in the influential areas of the power plant Paroșeni……………………………………..223 C.S. MOLDOVAN, C. IONESCU, L.S. SBIRNA - Using FBC technology to study the SO2 emissions resulting from combustion of Jiu Valley coal……………………………….233 C. VRÂNCEANU, D. MARCHIŞ, G.L. DOBREI, R.I. SÂRBU - The separation of coal particles in sterile flotation deposits in coal tailing ponds through the use of hydrocyclonation………………………………………………………………………240 I.N. TIUZBAIAN - Aspects of the analysis of the mining industry production process……...244 V. VOIN - Selection methods of elastic waves aerial at surface employed in seismic prospecting……………………………………………………………………………..250 D.I. CIOLEA - Research on the obtaining and disposal sludge in the Jiu Valley…………….255 Annals of the University of Petroşani, Mining Engineering, 14 (2013) 5 R.I. MORARU, J. GRABARA, J. TABOR, M. POPESCU STELEA - Analyse de l'opportunité d'utilisation des méthodes quantitatives d'analyse des risques dans le secteur minier de Roumanie……………………………………………………………………………….261 D.I. CIOLEA - Studies on the wastewater sludge from the western part of Romania………..269 G. NANU, D. MARCHI - Identifying the pollution sources in Peşteana Quarry and assessing the impact on the environment…………………………………………………………277 E. PANTURU, A. FILCENCO – OLTEANU, O. DOBRE, C. NICOLAE - Adsorption of uranium from waste water using activated carbon with nano-iron impregnated……...288 Index of authors……………………………………………………………………………….297 Instructions for authors………………………………………………………………………..298 Scientific reviewers……………………………………………………………………………299 Annals of the University of Petrosani, Mining Engineering, 14 (2013) 7 ENERGY PRODUCTION COMPETITION THROUGH THE CHANGE OF THE MINING TECHNOLOGY OF THE MINES OF HUNEDOARA ENERGETIC COMPLEX VALERIU PLESEA* SORIN MIHAI RADU** Abstract: The economical impact ant the worldwide population increase is moderated by the decrease of the demand of electric energy, as an effect of the structural changes of the economy, the technical progress and the increase of the price of energy. The global market for energy shall be dominated by combustible fuels, their proportion being considered to reach almost 80% of the demand in 2030. Oil, natural and schist gases shall remain the main energetic resource, representing approximately 35% of the demand, the percentage of coal being 30%. By 2030, almost two thirds of the increase of coal supplies will be brought from Asia. As the single and most important player on the energy production market by burning black coal, Hunedoara Energetic Complex – HEC, through its Mining Branch, has the task of increasing the efficiency and improve the underground coal extraction technology, in order to situate the render the complex coal extraction process economically efficient considering the characteristics and rules of a free market, as well as the requirements demanded by labour safety conditions and ore protection. The paper brings forward, considering the undermined front coal exploitation method the proportion of which reaches 65% for the realisation of the total production on the entire coal basin, some of the technical mechanisation solutions of the main operations which define a complete coal face cycle. Key words: coal, exploitation, mechanisation, energy, explosion, coal front. 1. GENERAL CONSIDERATIONS As an effect of the actions undergone to improve the efficiency by reducing the exploitation activities HEC, respectively Petrosani Mining Branch Subdivision, as well as the sustained efforts by the mining staff of