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Brief Development of tunnel would be partially through flotation tailing dump and partially through rock massif. Krivelj`s river stream would be regulated by new tunnel, because the old manifold could be destructed. Project No. 17004 (2008-2010) Ministry of Science and Technology Development explored all aspects of the environment in which the new tunnel is designed (primarily engineering-geological, hydrogeological and petrology features).

Details presents in the paper realize at collaboration the Ministry of Science and Technological Development on project No 17004 R. Serbia. Presented carakterisics clivage in aspect on massif rock research in drillholes B-1k, B-2k, B-3k, B-4k and B-5k. Evaliation of rock stability, in which will be place tunnel axis, took from prospecting Krivelj`s River. Iinvestigations are: structural characteristicsa of rock massif, degree of disintegration, alteration degreee, fracture degreee and physico-mechanical characteri...