The invention uses the cleaning flotation technique of oxidized, sulfurized polymetallic tailings to reduce the concentration of heavy metals arsenic, barium, cadmium, chromium, mercury and lead with a reduction percentage of up to 90% of the concentration of said metals. that complies with the values ​​of the Maximum Permissible Limits of the Standard of Environmental Quality of the Soil of Peru and the (EPA), to achieve a "decontaminated tailings" is used as a "raw material" to be mixed with remedial agents to make "aggregate of concrete "and make" bricks "