Geotechnical Properties of Mine Tailings Journal of in which p 0 = 1 kPa e 0 = initial void ratio corresponding to p 0 and C c = compression index The fitting results of the four tailings are summarized in Table compression index C c is and for the coarse and fine iron tailings and and for the coarse and fine copper the coarse and fine iron tailings display a higher compressibility than the