In general, the simulated average of the combined lignite and waste volume is
in very good agreement with the actual one. The differences range from -4.3 % to
2.5 %. The same applies for the coefficient of variation, with very low values for
the combined lignite and waste volume. The agreement is not good for the particular
material types excavated on each bench, which calls for a refinement of the
model in regard to the interaction among the processes for the selection of material
type, the BWE advance, and the selection and implementation of the excavated
material conveying sequences.