In this paper the results theoretical estimation of value yield shear stress at the hydraulic transportation of poly-metallic ore tailings are presented. In basis of a method separate positions of the similarity theory are used thus in consideration the combination of numbers of Reynolds, Froud and Euler which set have led to the new dimensionless criterion describing the yield shear stress is accepted.
In paper the theoretical and experimental research results on selection of volume composition of backfilling mixture making from Dzhezkazgan copper ore tailings are presented. The obtained backfilling mixture not only provides the normative strength characteristics but also characterized by stability of rheological properties, good portability and moreover by uniformity of internal structure at relative low contents of cement M400.
