sci.ore-grade-cutoff-break-even Calculator
Calculates mine ore cut-off grade below which extraction is uneconomical: g_cutoff = (C_mine + C_proc)/(R × price × recovery). Cut-off grade optimization balances NPV against resource utilization — Lane's method determines dynamic cut-off grades that change over the mine life.
Inputs
- Price Usd T
- Reference formula or conversion factor shown for context.
- Recovery Pct
- Reference formula or conversion factor shown for context.
- Mining Cost Usd T
- Reference formula or conversion factor shown for context.
- Processing Cost Usd T
- Reference formula or conversion factor shown for context.
- G And A Usd T
- Reference formula or conversion factor shown for context.
Results
- break-even cut-off grade (%)
- The price, quantity, or time at which total revenue equals total cost — neither profit nor loss.
- cut-off grade (g/t for gold etc.)
- Letter or numerical grade indicating quality, creditworthiness, or performance on a defined scale.
- total operating cost ($/t ore)
- A standardised quality or risk rating on the applicable scale.
- revenue per tonne at cut-off
- The value at the specified point or condition.
- Lane 1964: COG = (Cm+Cp+G&A)/(P×recovery)
- Sample size or count used in the calculation.
- sensitivity note
- Supplementary information explaining an assumption, caveat, or important context for interpreting the result.
metallurgical gold break cutoff even