Much less experience in this area have domestic mines. There is no doubt that in the case of rocks of brevity greater than 20 MPa (including limestone, dolomite, sandstone, marl, travertine, etc.) the lowest unit costs expressed in zł/Mg is achieved using the technique of blasting. However, in the case of rock, which can not be classified into these groups, there may be some difficulties as to the choice of methods of mining. These rocks include the half-solid sedimentary or metamorphic rocks, which are relatively to few concise to use mining of explosives, but too consise for single-bucket excavators. To mining of such rocks can be used ripper accessories, mounted on crawler dozers, which in recent years have become a serious alternative mining methods to blasting techniques.