Managing calculations with stockpiled materials

Managing Energy Calculations with Stockpiled Materials

When you work with materials stockpiled from one year to the next, it is essential to adjust your consumption calculations (energy, consumables…) for each stage of the process. The principle is simple: the declared energy data must always correspond to the total amount of material transformed into finished products during the current year.

1. Example scenario:
   • You excavated 100,000 tons of aggregates this year.
   • You transported and processed 150,000 tons, using the 100,000 tons excavated this year plus 50,000 tons from last year's stockpile.
   • Ultimately, you produced 150,000 tons of finished products this year.
2. Calculating energy (Stage A1: excavation):
   • For stage A1 (excavation), you must declare the energy required to excavate the 150,000 tons of material.
   • This includes the energy consumed for the 100,000 tons excavated this year (from your current records) plus the energy used to excavate the 50,000 tons from the previous year. For the latter, you can use a pro rata calculation or the previous year's data if available.
3. Calculating energy (Stages A2 & A3: transport and processing):
   • For stages A2 (transport) and A3 (processing), you must declare the energy consumed for the 150,000 tons you actually transported and processed this year.
   • For these stages, you only need to refer to your current-year energy records, as they accurately reflect the 150,000 tons that were handled.

By following this method, you ensure that each stage of your energy balance correctly reflects the quantity of material that was processed to become a finished product.