The objective of this work was to valorize the waste rock from the Bakwanga Colline Zone 4 mining site of the MIBA with pockets and layers of gravel containing more than 10 carats of diamonds per cubic meter, but abandoned because of the large volume of waste rock to excavate and move. To recover this waste rock, it is important to identify them and classify them in a category of construction materials. Soil identification and classification work based on the USCS, AASHTO, LCPC systems and many other classification standards (XPP 94-011) incates that these are SP sands or poorly graded sands or still group A-3 sands, non-plastic, non-organic, non-marly and compact. These soil classification systems indicate that the soils studied are among the soil classes with the best behavior as road infrastructure materials. They are also used in civil engineering works such as compacted earth dams in the shoulders and in the foundations. Studies made on the same types of soils in certain corners of the city of Mbuji-Mayi indicate that these soils can also be used for the manufacture of baked bricks or stabilized bricks.