In the following research work the influence of the calcium carbide dosage and the aeration time on the percentage of gold recovery of an arsenical flotation gold tailings was studied. The independent variables are: dosage of calcium carbide with levels 0, 3 and 6 Kg / TM and the aeration time at 0, 30 and 60 minutes. The flotation tailings made the granulometric analysis with # 200 mesh, then the grinding curve was made to obtain 80% through # 400 mesh, then the pulp milling was done by adding 0.5 Kg of tailings to 67% solids and adding calcium carbide as per test; the pulp was discharged into a vessel to stir and insufflate air according to the established levels, then the cyanidation was done in the bottle for 24 hours at 5000 ppm of NaCN; At the end, the solids were washed, dried and analyzed by means of Fire Assay and a mixed method for calculating gold recovery. From the result of ...