Bergbau-Tools Ore Cutoff Grade Calculator

Erz-Grenzgehalt-Rechner

Schätze den kostendeckenden Grenzgehalt aus Metallpreis, Rückgewinnung, Abbaukosten, Verarbeitungskosten und G&A.

Unterstützt Einheitenumrechnung, Preis-Szenariovergleich, Sensitivitätsanalyse, PDF-Export und mehrsprachige Nutzung.

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Bergbau-Tools

Calculate break-even cutoff grade instantly

Bergbau-Tools

Compare Low / Base / High side by side

Bergbau-Tools

Built for multilingual and decimal-comma users

Wofür dieses Tool gedacht ist

Unterstützt Einheitenumrechnung, Preis-Szenariovergleich, Sensitivitätsanalyse, PDF-Export und mehrsprachige Nutzung.

Instant calculation

Normalize prices and costs, then calculate the break-even cutoff grade immediately.

Unit conversion

Convert g/t, %, ppm, oz/t, and kg/t to absorb differences in regional notation.

Scenario comparison

Compare Low / Base / High cases by changing metal price only.

Easy to share

Save the result as a PDF from the browser print dialog and use it in meetings right away.

How to use

  1. 1 Enter the metal price currency, unit, and recovery.
  2. 2 Align mining cost, processing cost, and G&A to the same ore basis unit.
  3. 3 Add scenario rows if needed and review the sensitivity span.
  4. 4 Check the cutoff grade and export it by CSV or PDF.

Examples

Gold

Input / Output

Input

2400 USD/oz, recovery 90%, mining 18 USD/t, processing 14 USD/t, G&A 8 USD/t

Output

cutoff grade about 0.576 g/t (about 0.0185 oz/t, 0.0000576%, 0.576 ppm)

Copper

Input / Output

Input

4.10 USD/lb, recovery 88%, mining 22 USD/st, processing 12 USD/st, G&A 8 USD/st

Output

cutoff grade about 0.479% (about 4,790 ppm)

Silver scenario comparison

Input / Output

Input

24 / 27 / 30 USD/oz, recovery 85%, total cost 40 USD/t

Output

Low: about 61.1 g/t / Base: about 54.2 g/t / High: about 48.2 g/t

Glossary

cutoff grade
The minimum grade used as a break-even reference.
recovery
The share of metal recovered from the ore.
G&A
Short for General & Administrative expense.
ppm
In this tool, ppm uses the same number as g/t on a metric-tonne basis.
st / lt
Short ton and long ton. Ambiguous ton is not accepted.

Formulas

Metal price / g = metal price ÷ grams per price unit
Total cost / t ore = (mining cost + processing cost + G&A) × ore basis factor
cutoff grade (g/t) = total cost ÷ (metal price / g × recovery)
g/t → % = g/t ÷ 10000
g/t → oz/t = g/t ÷ 31.1034768

FAQ

What is cutoff grade?

It is the minimum grade used as a break-even reference. It changes with metal price, recovery, and cost assumptions.

Does this tool handle payability?

Not in the first version. It assumes 100% payable and uses recovery only.

Are ppm and g/t the same?

Yes, on a metric-tonne basis this tool uses the same number for ppm and g/t. It treats 1 ppm = 1 g/t.

Can I use short ton and long ton?

Yes. Enter t, st, or lt explicitly. Ambiguous ton is not accepted.

Can I save PDF output from the browser only?

Yes. The tool provides a print layout and uses the Chrome / Edge / Safari print dialog for PDF saving.

Hinweise

  • This tool is for quick reference only and does not replace JORC / NI 43-101 / technical reports.
  • Dilution, mining loss, payability, royalties, taxes, and freight are not part of the core calculation.
  • Enter metal price and cost in the same currency.
  • All calculations stay inside the browser and are not sent to the server.