are operation expenses derive horn trie services rendered by CR Operaciores y Mantersrrnerto. S,A (Nate 10) 16. Administrative expenses 2014 2013 Professerel services 1 880.815 S 925,994 Plant operation expenses 167.051 160.832 Materials and supplies 18.370 52(60 Travel 3.071 2922 Ctrer 14,5