ABSTRACTThe life of tools in lithic assemblages from European Middle Paleolithic sites reveal different processes of dilation, such as ramification (the use of a flake as a production matrix, from which a second and sometimes even a third tool is produced) and tool on core (TOC), core on tool (COT) and core on flake (COF) processes, with the presence of resharpening tools and the presence of double patinas as further evidence. Technological studies suggest that items in a lithic assemblage have gone through function changes (through reuse or recycling), but only use-wear analysis can demonstrate what these changes of function have been. Of particular interest is the recycling of cores, which often become tools (retouched or non). In this paper, we analyze several cores recovered in Level 4 of Prado Vargas, in which we demonstrate what their use was after the first function as matrixes of exploitation and flake-production.