Presentado en el V Seminario Peruano de Geoingeniería.Por: M.A. Lozada y A.A. Goñe, Compañía Minera Ares, Pallancata, Ayacucho, Perú.AbstractThis study presents the research and previous tests to incorporate in the shotcrete design a percentage of tailings material that replaces another percentage of sand for support purposes in underground mining, maintaining adequate safety factors in our Mining Operation. To develop the technical research, several designs have been conducted at laboratory level, as well as field tests and monitoring of the shotcrete with 10% tailings in the design. Strength tests have been conducted at 4 hours, 3 days, 7 days, 14 days and 28 days, and in the case of flexural strength, at 28 days. And we have complemented the research with microscopy tests of both the tailings and the river sand.