Ore Value Calculator
Estimate contained metal, recoverable metal, revenue, total operating cost, and net value from a simplified mining model.
What Is an Ore Calculator?
An ore calculator is a practical planning tool used in mining and mineral economics to convert basic inputs into useful business numbers. Instead of only asking, “How much rock do we have?”, it helps answer more meaningful questions like: “How much metal is actually in that ore?”, “How much can be recovered in the plant?”, and “Will the project generate a positive margin?”
The model above is intentionally simple, but it still captures the core drivers of value: ore tonnage, ore grade, recovery rate, dilution, metal price, and operating costs. That combination gives a fast first-pass estimate before deeper engineering studies are done.
How This Ore Calculator Works
Inputs Explained
- Ore tonnage: Total tonnes of ore available for mining.
- Head grade (%): Concentration of valuable metal in ore before processing.
- Recovery (%): Portion of contained metal actually recovered in processing.
- Dilution (%): Waste material mixed with ore during mining, increasing tonnes and lowering effective grade.
- Metal price: Revenue value per tonne of payable metal.
- Mining + processing costs: Operating cost per tonne processed.
Core Formulas
- Contained metal = ore tonnage × grade
- Diluted tonnes = ore tonnage × (1 + dilution)
- Effective grade after dilution = contained metal ÷ diluted tonnes
- Recoverable metal = contained metal × recovery
- Gross revenue = recoverable metal × metal price
- Total operating cost = diluted tonnes × (mining + processing cost)
- Net value = gross revenue − total operating cost
Why Ore Grade and Recovery Matter So Much
Two mines can process the same tonnage but deliver very different economics due to small changes in grade and recovery. A grade increase from 1.0% to 1.2% is a 20% jump in contained metal. Likewise, raising recovery from 85% to 90% often improves revenue without increasing mined tonnes. These two variables are usually the strongest value levers in a quick ore valuation model.
In contrast, dilution often moves in the opposite direction. More dilution means more tonnes to process while the metal content stays nearly the same, which pushes up cost per payable unit of metal. That is why grade control and selective mining are so important in real operations.
Using the Calculator for Better Decisions
1) Compare scenarios quickly
Run “base,” “optimistic,” and “conservative” cases by changing only one variable at a time. This gives a quick sensitivity check and helps identify the factors with the largest economic impact.
2) Estimate cut-off pressure
If operating costs rise or metal price falls, the break-even grade climbs. That can convert marginal ore into waste. The calculator provides a break-even grade estimate so planners can see where risk begins.
3) Support early communication
A transparent, formula-based model helps geology, mining, and finance teams align on assumptions before detailed schedules, metallurgical models, and cash-flow analyses are built.
Common Mistakes to Avoid
- Mixing units (for example, entering grade in g/t when the calculator expects %).
- Assuming 100% recovery in economic screening.
- Ignoring dilution in underground or narrow-vein situations.
- Treating this simplified output as a full feasibility study.
- Using stale metal prices and cost assumptions.
Final Thoughts
This ore calculator is designed for fast insight, not final mine design. It gives a strong first look at mining economics by linking geology and processing assumptions to potential financial outcomes. If your project remains attractive across multiple price and recovery scenarios, that is a good signal to move on to more detailed technical and financial analysis.