Impact Area Value Calculator

Mining is not a temporary land use, and to date, mining has largely externalized (written off) most environmental costs; especially those outside the mine property.

The Impact Area Value (IAV) calculator is one method to account for these costs.

The Calculator will ask you some specifics on the mine. Click the “?” by each field to get the pop-up help window.

  1. Company Name
  2. Project Name
  3. Location
  4. Project Footprint (hectares)
  5. Project Impact Footprint (hectares – default set to x4 Project Footprint, but you can use your own)
  6. Water Bodies (area in hectares of affects waterbodies)
  7. Natural Area Value – Per-hectare value of affected land in jurisdiction
  8. Seismic Zone – scale of 1 to 5 (British Columbia)
  9. Precipitation Zone – scale of 1 to 5 (British Columbia)
  10. Comminution (crushing processes)
  11. Sizing (sizing and sorting of ore)
  12. Concentration (concentration/mixing technologies used)
  13. Company Profile – we scale from 1 (high) to 4 (poor)
  14. Dry-Stack or TSF (up to 2 TSFs)
  15. TSF (tailings storage facility) Dam Design (4 types)
  16. TSF Embankment Slopes (Factor of Safety) (up to 5 embankments per TSF)
  17. Solids By Weight (Solid-to-Water) ratio of tailings in each TSF
  18. TSF Liner Type (scale of 1 -3)


The Calculator will display 3 colour bar graphs indicating the Project Footprint, Project Impact Footprint, and Water Body areas affected.

Below the bar graphs is the Impact Area Value/cost of the mine in dollars ($).

At the bottom is the sliding scale which has a Base Risk setting of 10.8% (see pages 19 – 21 of “Impact Area Value II: The Formula”). The IAV will place your mine somewhere along this scale, depending on the input parameters.

Please forward any comments or questions to