ABSTRACT: Almost all granite, gabbro and basalt quarries have been abandoned in the last ten years, especiallyin the eastern Black Sea Region because of high operation costs and cheap hard rock entrance to Turkeyfrom the countries such as China and India. In the study, the Saraftepe hard rock quarry in the TrabzonCity was selected as a pilot site for encouraging and developing the hard rock production in the region,and the formation condition and geological properties of the operated tephrites in the quarry wereinvestigated. Thickness of the operating tephrite varies between 25 and 30 meters and it crops out along750 meters. This tephrite sill intruded in the N70E/25NW directed limestone, marl, sandstone and tufflayers. Geomechanical properties of the tephrite samples were investigated and some laboratory testswere conducted on the rock samples obtained from different zones because there is an anisotropic structurefrom top to bottom in the sill. The result of the conducted tests on the rock samples obtained from thedifferent zones show that their uniaxial compressive strength values are between 87 and 130 MPa, p-wavevelocities are between 5048 and 5642 m/s, density values are between 2.58 and 2.68 g/cm3, apparentporosity values are between 2.77 and 4.54 % and water absorption by weight are between 1.04 and 1.78%. The weight lost at the end of the freezing-thawing test and wetting-drying tests are 0.36 and 0.22 %,respectively. These test results shows there is % 10 strength loss at the end of the tests. Considering the allinvestigation results, the studied tephrite will contribute to the regional economy.