1 INTRODUCTIONThe strength of the rock mass depends on the properties of the intact rock as well as the presence and distribution of discontinuities (e.g. faults, folds and joints, etc.) ( Bell., 1978). In order to measure the strength properties of intact rocks, several laboratory techniques have been developed. These laboratory techniques can be performed either on core samples or on bulk samples. The physical and mechanical properties of intact rocks strongly depend on their mineralogical composition and texture. Many attempts have been made to establish relationships between them (Bell, 1978; Dobereiner and De Freitas, 1986; Shakoor and Bonelli, 1991; Yates, 1992; Ulusay et al., 1994; Bell and Lindsay, 1999). Physical and mechanical properties also have interrelationships with each other. The most commonly used mechanical parameters include uniaxial compressive strength, point load resistance index and Schmidt rebound values ​​which are calculated from the uniaxial compressive strength (UCS) test, Point Load Test (PLT) and Schmidt Rebound Hammer (SRH). ) testing plays an essential role in the design of engineering and mining structures. But these tests are expensive, sophisticated and time-consuming. In contrast to this, other strength tests (i.e. point load test and Schmidt rebound hammer test) are inexpensive, simple to perform and samples can be prepared easily. The UCS can be easily calculated using indirect methods suggested by (D'Andrea et al. 1964; Reichmuth 1968; Broch and Franklin 1972; Bieniawski 1975). The present study focuses on the preparation of technical geological map and correlation between strength parameters (determined from PLT and SRH) and mineralogical composition of Lockhart Limestone and Margall Hill Limestone of Rumli, Islam. ..... middle of paper ......h sandstones from the Sherwood Sandstone Group of North Staffordshire with reference to microfabric. Quarterly Journal of Engineering Geology 25, 107-113.D'Andrea DV, Fisher RL, Fogelson DE (1964) Predicting compressive strength from other rock properties. Col Sch Mines Q 59(4B):623–640Reichmuth DR (1968) Point load testing of brittle materials to determine tensile strength and relative brittleness. In: Grosvener NE, Paulding BW (eds) Proceedings of the 9th American symposium on rock mechanics. Port City Press, Baltimore, pp 134–159Broch E, Franklin JA (1972) Point load resistance testing. Int J Rock Mech Min Sci 9(6):669–697Bieniawski ZT (1975) Point load testing in geotechnical practice. Eng Geol 9(1):1–11Sabatakakis N, Koukis G, Tsiambaos G, Papanakli S (2009) Microstructure-controlled index properties and strength variation for sedimentary rocks. Eng Geol 97:80–90