Mining Vehicle & Underground Equipment worked example

Underground Duty Cycle at 12% tramming, queuing and delay allowance: a worked example

This scenario runs the underground duty cycle calculation on the strong side: 12% tramming, queuing and delay allowance, with every other input held at its documented default. Use it when underground duty cycle in mining vehicle and underground equipment is changing rate or allowance and you want to see the impact.

The inputs for this scenario

  • Loads or trips to move underground: 120 units (unchanged)
  • Trips completed per minute at the face: 12 units / min (unchanged)
  • Tramming, queuing and delay allowance: 12 % (raised for this scenario; the documented default is 10)

Working through the calculation

  • Applying the documented formula (Base underground duty cycle time = underground duty cycle workload รท underground duty cycle completion rate) to the inputs above produces each figure below.
  • At this operating point the engine returns 11.2 hr for required underground duty cycle time, the number this scenario is built around.
  • At this operating point the engine returns 10 hr for base underground duty cycle time.
  • At this operating point the engine returns 12 % for underground duty cycle allowance applied.
  • At this operating point the engine returns 12 pieces / min for underground duty cycle completion rate.

How this compares with the baseline

  • Against the tool's baseline example, where tramming, queuing and delay allowance sits at 10% and the headline result is 11 hr, this scenario comes in 1.82% above the baseline at 11.2 hr.
  • Use it when planning a shift's haulage, sizing a fleet to a production target, or sanity-checking whether a heading clears within available hours. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Required underground duty cycle time: 11.2 hr (headline result)
  • Base underground duty cycle time: 10 hr
  • Underground duty cycle allowance applied: 12 %
  • Underground duty cycle completion rate: 12 pieces / min

Run it with your numbers

  • Every input above is editable in the live Underground Duty Cycle calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.