Building materials of non-metallic materials; construction materials of non-metallic materials; non-woven fabrics for construction purposes; woven fabrics for construction purposes; non-metallic stabilisation geotextiles for use in construction; non-metallic linings for use in construction; building materials in the form of a geosynthetic clay liner (GCL) used in exposed lining and capping applications for tailings dams and waste materials, mining process water and settling ponds and reduced cover landfill caps