Open-pit haulage

Truck-Shovel Cycle Time Varaivity Reiknivél

Calculate cycle time from load time, haul distance, speed, and wait time, then bera saman theoretical and actual varaivity instantly.

Use fleet size sensitivity, operating rate samanburðurs, and bottleneck labels on the same skjár.

Show cycle time and varaivity together
Fleet size sensitivity
Operating rate samanburður
Bottlenecks at a glance
How to read the niðurstaða
Haulage in open-pit mining is hazardous. Niðurstaðas do not replace safety rules.
Cycle time

The loading, travel, and wait pieces are shown as one truck cycle.

Fleet balance

See whether the truck side or the shovel side is limiting, along with the recommended truck count.

Inntaks are processed only in this browser and are never sent to a server.

Safety notice

  • Haulage in open-pit mining is hazardous. Niðurstaðas do not replace safety rules.
  • Grade, rolling resistance, payload limits, weather, and maintenance can change niðurstaðas a lot.
  • Use observed average wait time and operating rate from the site.
  • Always follow local law, dispatch rules, and safety procedures.

How to use

  1. Choose the unit kerfi and payload unit.
  2. Choose simple or detailed travel mode, then enter load time, travel conditions, and wait time.
  3. Enter truck count, shovel count, and operating rate.
  4. Yfirferð cycle time, theoretical and actual varaivity, bottlenecks, and fleet size sensitivity.

Sample

Metric basic case

Inntak

60 t payload, 3:00 load time, 4.0 km one-way haul, 25 km/h, 1:00 wait time, 6 trucks, 1 shovel, 85% operating rate

Úttak

cycle time about 23.2 min, theoretical about 973 t/h, actual about 791 t/h, truck-limited, recommended about 8 trucks/shovel

Imperial case

Inntak

80 st payload, 3:00 load time, 2.5 mi one-way haul, 18 mph, 1:30 wait time, 5 trucks, 1 shovel, 80% operating rate

Úttak

cycle time about 21.2 min, theoretical about 1,220 st/h, actual about 907 st/h, truck-limited

Detailed mode case

Inntak

60 t payload, loaded 4.0 km at 22 km/h, return 4.0 km at 32 km/h, 3:00 load time, 1:00 wait time, 8 trucks, 1 shovel, 90% operating rate

Úttak

cycle time about 22.4 min, theoretical about 1,200 t/h, actual about 1,080 t/h, shovel-limited

Algengar spurningar

Is haul distance one-way or round trip?

In simple mode, enter one-way distance and the verkfæri doubles it internally. Detailed mode lets you enter loaded and return legs separately.

What is the difference between theoretical and actual varaivity?

Theoretical varaivity assumes no wait time and 100% operating rate. Actual varaivity reflects wait time and operating rate.

What changes when I change the operating rate?

Actual varaivity changes linearly. The samanburður tafla shows the difference from 50% to 100%.

Is the fleet size analysis a queue simulation?

No. It is a static capacity samanburður that keeps the entered average wait time fixed. It does not estimate queue growth automatically.

Can I switch between t and m³?

Yes. Choose the unit you actually use on site. The verkfæri does not convert by density, so enter the basis unit directly.

Can multilingual teams use it?

Yes. The page is translated from English, and URL sharing reproduces the same state.

Glossary

Cycle time

Time for one truck to complete a full loading, haul, return, and wait cycle.

Payload

Average load carried per truck cycle.

Operating rate

Share of áætlund time actually used for varaion.

Bottleneck

The resource or step that most strongly limits úttak.

Match factor

Indicates the balance between truck-side and shovel-side capacity. Values near 1 are more balanced.

Wait time

Average waiting time including queue, dump, spotting, and short delays.

Formulas

  • map[Text:travelTimeSimple = 2 × haulDistance / haulSpeed × 60 text:travelTimeSimple = 2 × haulDistance / haulSpeed × 60]
  • map[Text:travelTimeDetailed = loadedHaulDistance / loadedHaulSpeed × 60 + returnHaulDistance / returnHaulSpeed × 60 text:travelTimeDetailed = loadedHaulDistance / loadedHaulSpeed × 60 + returnHaulDistance / returnHaulSpeed × 60]
  • map[Text:idealCycleTime = loadTime + travelTime text:idealCycleTime = loadTime + travelTime]
  • map[Text:actualCycleTime = idealCycleTime + waitTime text:actualCycleTime = idealCycleTime + waitTime]
  • map[Text:theoreticalTruckRate = payload / idealCycleTime × 60 text:theoreticalTruckRate = payload / idealCycleTime × 60]
  • map[Text:actualTruckRate = payload / actualCycleTime × 60 text:actualTruckRate = payload / actualCycleTime × 60]
  • map[Text:shovelRate = payload / loadTime × 60 text:shovelRate = payload / loadTime × 60]
  • map[Text:actualFleetRate = min(truckCount × actualTruckRate, shovelCount × shovelRate) × operatingRate text:actualFleetRate = min(truckCount × actualTruckRate, shovelCount × shovelRate) × operatingRate]
  • map[Text:recommendedTruckCount = ceil((shovelCount × shovelRate) / actualTruckRate) text:recommendedTruckCount = ceil((shovelCount × shovelRate) / actualTruckRate)]

Athugasemdir

  • This verkfæri is a áætlunning aid only. It is not a queue simulation.
  • Road grade and rolling resistance are not modeled automatically. Adjust speed and wait time to match site reality if needed.
  • Enter the payload unit used on site. The verkfæri does not perform density conversion.
  • Fleet size sensitivity keeps the entered average wait time fixed.