5.2 Plasticity of Fines

Plasticity of the fines may have an impact on the shear strength characteristics of the material, and may be indicative of the type of clay minerals contained within it. If a substantial component of silt sized or finer material occurs within the mine rock, the plastic limit of this material should be determined in the laboratory. Atterberg Limit test may also be conducted on mechanically disaggregated, fine-grained sedimentary rocks.