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This paper discusses the causes of surface deformation as a consequence of mining activities. Surface deformation associated with underground coal mining, named subsidence, is a gradual settling of the earth?s surface. Subsidence effects can result from all mining methods, but especially coal mining. Some of the primary effects of surface subsidence include damages of infrastructure (buildings and roads). The most vulnerable areas for deformation are those where underground mine working are closed to the ground su...

Road structures construction and maintenance involves the use of large amounts of materials, including natural aggregates that occupies the largest share. On one hand the quality of natural aggregates, and other road ma terials, is decisive for the success of the technologies used in the road construction sector and on the other hand, the diversity, and number of the possibilities of purchasing and the number of producing units are more varied for natural a ggregates with possibilities to significantly influence t...

Praid salt deposit is one of the largest in Europe: the salt body has an elliptic shape, with diameters of 1.2 km and 1.4 km, the depth being extended until 2,700 m. The mining methods employed in time are various: be ll-shaped rooms, trapezoidal rooms. Nowadays, the small rooms and square pillars is employed, the method being described in the paper. At 120 m depth, the cure and treatment facility is located. The underground atmosphere is highly ionized and very eff ective in treating respiratory diseases. The Pra...