English to Portuguese Tech/Engineering Mining & Minerals / Gems Waste management/Gestão de resíduos

The good management of tailings and waste-rock includes evaluating alternative options for conditioning the tailings and waste-rock within the process to minimise any environmental or safety hazard, such as:
- de-pyritisation
- addition of buffering material.

The idea is that this material is placed to reduce the scattering of blasted material and to improve its fragmentation. I would translate it as "material amortecedor" if there's no technical specific term.