5.8 Mineralogy and Soil Chemistry

Mineralogy and chemical composition of overburden material may be important. The presence of certain clay minerals may fix some contaminants or slow their release. Overburden soils may also tend to buffer surface and groundwater. The presence of swelling or low strength clay minerals can have a significant impact on the shear strength characteristics and behaviour of the dump material. It can also influence the durability and strength of foundation bedrock.