The frank and carbonate serpentines of Bou Azzer are very friable metamorphic rocks. The mining excavations carried out in these rocks, whether permanent structures such as shafts, chutes, chimneys and galleries or temporary structures such as cuttings, suffer from a number of instability problems, which can be summarized as landslides and block falls. The purpose of this project is to make a characterization study of serpentines, whether frank or carbonate and identify the fracturing and mechanical characteristics of these rocks in order to understand their behaviour and design types of support that will be suitable for them. To try to structure the knowledge and to provide tools to help the design, some authors have very early-proposed syntheses in the form of classifications. These methods, quick to use and therefore economical, are based on different geotechnical parameters. It is the choice of these parameters and the way they are used for the design of the structure that will make the difference from one method to the other. In this article, the study was conducted at the scale of the sites Bou-Azzer East, Bouismass and Ait-Ahmane at the mine Bouazzer. My work consists, therefore, to characterize the rock mass in these three sites to design a suitable support. We will try to classify the rock mass of the various structures mentioned in the problem according to the empirical methods namely the RMR, the Q-system and the classification of the AFTES. The facies in question are Frank Serpentine, Carbonate Serpentine, Mineralized Case, Altered Diorite, Altered Chloritized Diorite and Diorite.