Field Tools.
16 free engineering calculators for mining and heavy civil. Every equation cited to the handbook and the page.
Your ROI, worked out
Hours back and money made. Your numbers, not ours.
Two of these tools put a number on the office side of the job. Plug in your own crews, rates and jobs. Every step is shown, so you can argue with any line.
Hours savedReporting Chain CostWhat the paperwork from shift report to invoice costs you a year, in office hours and dollars.Work out your hours
Money madeJob Cost and MarginJob cost, margin, cost per meter or ton and cost against budget, for every job you run.Work out your margin
- Up to20ha week, per supervisor, on paperwork.
- Counted4,871emails read and sorted in our own companies, October 17, 2026.
- About860hof work done in the same count. Hours estimated from minutes per task.
Surface 7
Open pit, quarry, haul road and the water in the pit.
Bench Blast PatternBurden, spacing, stemming, subdrill and explosive per hole from hole diameter and bench height. Two published methods.Open the tool
Blasthole Drill ProductivityMeters per shift, holes per shift and cost per meter for a surface blasthole drill, from the rock being drilled.Open the tool
Truck Cycle Time and Fleet MatchHaul cycle time and how many trucks it takes to keep the loader busy. Surplus trucks flagged.Open the tool
Shovel and Loader ProductivityBank tons per hour and cost per ton, from the material and the bucket on the machine.Open the tool
Haul Road DesignRunning width, curve widening, superelevation and stopping distance, checked against the published limit.Open the tool
Dewatering Pump and Pipe SizingTotal dynamic head, brake horsepower, motor draw and whether the pump can prime where it sits.Open the tool
Asphalt TonnageTons from length, width and compacted thickness, plus paver tons per hour, paving hours and truckloads.Open the tool
Underground 6
Development, blasting, support, air and the shaft.
Jumbo DevelopmentMeters of advance per shift, per day and per month from the round drilled and how the cycle runs.Open the tool
Round Charge and Powder FactorExplosive per development round from the published loading equation, and whether the powder factor is sane.Open the tool
Ground SupportRock mass rating from face observations, rock class, and the bolt and shotcrete pattern the guidelines call for.Open the tool
Pillar DesignTributary-area pillar load, eight published strength formulas, factor of safety and extraction ratio.Open the tool
Auxiliary VentilationAirflow a heading needs, duct pressure loss, fan duty and what the fan costs to run for a year.Open the tool
Shaft Hoisting CapacityHoist cycle time, skip payload, rope strength, drum and motor sizing for a mine shaft.Open the tool
Safety 1
The number the inspector looks at.
The two ROI tools show what your paperwork costs. We fix it.
A 20-minute call with people who have worked underground. We sign your NDA before we see anything.
Why you can trust the numbers
- CitedEvery equation and constant cites its handbook, edition and page. If a number looks wrong, you can check where it came from.
- Estimating aidsThey are estimating aids, not engineering designs. Design decisions on a live operation belong to the competent person on site. Full terms on the disclaimer page.
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