It is widely accepted that specific energy expressed in kwh/m(3) is a good indicator of production capacity of a rapid excavation systems, i.e. roadheaders, continuous miners, shearers etc. Specific energy is best obtained from rock cutting experiments either from small-scale or full-scale cutting experiments, In the past. some research workers attempted to correlate rock properties with specific energy values. However, these researchers were limited to coal measures rocks, The results given in this paper is a result of a research work supported by State Planning Organization. MTA, Mining Engineering Department of Istanbul Technical University and The Research fund of Karaelmas University. Several rock samples were subjected to a wide range of mechanical and cutting tests. It is concluded that some of the rock mechanical properties are well correlated with specific energy values which help to select the correct excavation equipment for a given rock or mineral.