Quantum percolation problem on 3D simple cubic lattice under influence of external magnetic field is discussed. Results of numerical simulations of magnetoconductance and its dependence on both the system size (temperature) and the concentration of metallic component p are presented. Qualitative agreement with theory for metals is obtained for large p, when the system is delocalized. For small p, when the system is localized, the agreement with weak localization theory predictions is successfully verified as well.

PACS numbers: 05.70.Jk, 71.30.+h, 72.15.Rn