A new approach to the calculation of work index and the potential energy of a particulate materialA new approach to the calculation of work index and the potential energy of a particulate material Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-11-172011enThe work index Wi was defined by F. Bond as the specific energy (kWh/ton) required to reduce a particulate material from infinite grain size to 100 microns. The calculation is based on the size-energy relationship e1,2=C.(1/x2n–1/x1n ) , which for n = 0.5, x1 = ∞ and x2 =100, by definition gives e∞, 100 = Wi and consequently C=10Wi. In theory, for a given material the value found for Wi.should be constant regardless of the measured sizes x1 and x2 used to calculate the constant C by measuring the energy e. In practice this is not so due to the fact that n ≠ 0.5 and many correction factors have been proposed to overcome this inadequacy experienced by accepting n= 0.5. The present paper proposes a simple way to calculate the appropriate exponent n using conventional grinding procedures. The same calculation can be used to calculate the true value of Wi and attribute a potential energy state to a material at any size. http://creativecommons.org/licenses/by/4.0/Geomaterials128-32 Staboliadis Ilias Σταμπολιαδης Ηλιας Emmanouilidis Stamatis Εμμανουηλιδης Σταματης Petrakis Evaggelos Πετρακης Ευαγγελος Scientific Research Publishing Engineering, Mining Mines and mining Mining mining engineering engineering mining mines and mining mining