The recent breaches of the Fundão tailings dam in 2015 and the Córrego do Feijão dam in 2019 have prompted professionals in the field and the government to call for changes in legislation on dam construction methods and new technologies for disposing of mining tailings; among these is the technique of dry stacking filtered mining tailings and reprocessing the tailings to form by-products. Although the stacking technique is promising, it is still prone to disruption and its filtration and disposal processes mainly use cement, a material that, although widely used in construction, requires a lot of energy and emits large quantities of toxic substances into the atmosphere during its production. In view of this, with a view to reusing materials, we propose the use of perlite residue to form geopolymers for the stabilization of a by-product of iron ore tailings. To this end, physical characterization tests were initially carried out on the materials, as well as mechanical characterization by means of Unconfined Compressive Strength and Direct Shear tests, and the results obtained made it possible to obtain the Porosity/Volumetric Content parameter of the cementing agent in the composites. The use of the geopolymer has proved promising in stabilizing the by-product, but further mechanical, chemical, environmental and microstructural analyses will be carried out to validate this thesis.