Daily dig rate of the unit is measured in production
units/time.
Usually, availabilities of the loading units are
determined from maintenance schedules whilst the
utilisation and dig rates are determined from past
performances and foreseen digability conditions.
Availability and utilisation are efficiency factors.
These input parameters are normally determined
from shovels only because haulage trucks are
usually sufficient. Typically, there are standby
trucks to replace any unscheduled breakdown
trucks. Production therefore is much dependent on
the activities of shovels.