Metal Recycling, Scrap Processing & Salvage worked example

Supplier Grade Variance with highest assayed grade reading across loads of 20 value: a worked example

This scenario runs the supplier grade variance calculation on the strong side: highest assayed grade reading across loads of 20 value, with every other input held at its documented default. Use it when supplier grade variance in metal recycling, scrap processing and salvage is being audited or compared against a control chart.

The inputs for this scenario

  • Highest assayed grade reading across loads: 20 value (raised for this scenario; the documented default is 8)
  • Lowest assayed grade reading across loads: 12 value (unchanged)
  • Nominal contracted grade target: 10 value (unchanged)

Working through the calculation

  • Applying the documented formula (Supplier grade variance range = highest supplier grade variance reading - lowest supplier grade variance reading) to the inputs above produces each figure below.
  • At this operating point the engine returns 0 units for supplier grade variance variation, the number this scenario is built around.
  • At this operating point the engine returns 0 value for spread.
  • At this operating point the engine returns 20 value for minimum.
  • At this operating point the engine returns 12 value for maximum.

How this compares with the baseline

  • Against the tool's baseline example, where highest assayed grade reading across loads sits at 8 value and the headline result is 40 units, this scenario comes in 100% below the baseline at 0 units.
  • Use it during supplier scorecarding, contract renewals, or when a string of off-spec loads makes you question whether a vendor's grade is drifting or just noisy. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Supplier grade variance variation: 0 units (headline result)
  • Spread: 0 value
  • Minimum: 20 value
  • Maximum: 12 value

Run it with your numbers

  • Every input above is editable in the live Supplier Grade Variance calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.