"Mechanical properties, specifically uniaxial compressive strength, tensile strength, propagation velocities for compressional (P) and shear (S) waves and dynamic elastic moduli, measured for rock types from the Rawlins, Wyoming T-2 underground coal gasification (UCG) site correlate well with mean grain size , volume percent cement, types of cement and percent porosity. Mechanical properties show the strongest relationship with the amount of calcite cement present. Mean grain size, percent porosity and percent clay cement show less pronounced relationships with mechanical properties when the amount of calcite cement present is small. Mechanical wave velocities and uniaxial compressive strength are related, but the relationship is not linear. Recommendations are given for routine sampling, testing and analysis procedures to assess mechanical and lithological parameters at UCG site"