ISSN 1062-7391, Journal of Mining Science, 2016, Vol. 52, No. 1, pp. 110–114. © Pleiades Publishing, Ltd., 2016. Original Russian Text © B. Petrović, S. Vujić, V. Čebašek, G. Gajić, D. Ignjatović, 2016, published in Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, 2016, No. 1, pp. 110–115. 110 ______________________________ MINERAL MINING ________________________________ _______________________________________________________________________________________________________________________ ________________________________________________________________________________________________________________________________ TECHNOLOGY Predictive Analysis of Slope Stability of Internal Dumps in Tamnava–West Field Mine after Flooding B. Petrović a* , S. Vujić b** , V. Čebašek c*** , G. Gajić c , and D. Ignjatović c a Elektroprivreda Srbije (EPS), Kolubara Mining Basin, Lazarevac, Serbia *e-mail: branko.petrovic@rbkolubara.rs b Mining Institute of Belgrade, Batajnički put 2, Belgrade, 11080 Serbia **e-mail: slobodan.vujic@ribeograd.ac.rs c University of Belgrade, Studentski trg, 1, Belgrade, 11000 Serbia ***e-mail: vcebasek@rgf.bg.ac.rs Received June 14, 2015 Abstract—The article reports the results of estimation of internal dump slope stability in flooded open pit coal mine Tamnava–West Field. The geostatic analysis of stability used methods by Bishop and Morgenstern–Price. The studies confirm that slopes of internal dump are sufficiently stable and sustain stability after drainage of the open pit. Keywords: Open pit mine, internal dump, slope stability, geostatic analysis. DOI: 10.1134/S1062739116010186 INTRODUCTION In the middle of May 2014, heavy fall of rain and the induced flood caused record loss to Serbia. In the night between May 14 and 15, the flooded river Kolubara with tributaries Peshtan and Turia flushed coal open pits in Kolubara Basin. The evidence on the disaster says: round 236 Mm 3 of water put out operation in Veliki Crljeni opencast mine with annual production capacity of 4 Mt of coal per year and in Tamnava–West Field OCM with the annual production output of 14 Mt of coal [1, 2]. Fig. 1. General view of opencast coal mines (a) before and (b) after flood: 1—Tamnava–West Field OCM; 2—Tamnava–East Field OCM; 3—Veliki Crljeni OCM; 4—Kolubara River.