Bulk Solids, Mining, Aggregates & Material Processing worked example
Stockpile Inventory Days with usable stockpile tonnage on hand of 6,300 tons: a worked example
Here is what the math looks like when conditions slip. We hold every other input steady and drop usable stockpile tonnage on hand to 6,300 tons, then walk the calculation through step by step. Estimate stockpile inventory days for stockpile inventory days for bulk solids, mining, aggregates, and material processing using plant-floor material, production, quality, capacity, or cost inputs.
The inputs for this scenario
- Usable stockpile tonnage on hand: 6,300 tons (the input this scenario stresses; the baseline uses 12,500)
- Average daily draw from stockpile: 850 tons / day (held at the documented default)
- Safety stock multiplier: 1.2 x (held at the documented default)
Working through the calculation
- The calculation starts from the formula this tool documents: Stockpile Inventory Days uses the entered stockpile inventory days for bulk solids, mining, aggregates, and material processing values on a consistent unit basis..
- Stockpile Inventory Days works out to 6.18 tons at these inputs, and this is the headline figure for the scenario.
- Unprotected stockpile inventory days works out to 7.41 days at these inputs.
- Usable stockpile inventory days inventory works out to 6,300 pieces at these inputs.
- Daily stockpile inventory days usage works out to 850 pieces / day at these inputs.
How this compares with the baseline
- Against the tool's baseline example, where usable stockpile tonnage on hand sits at 12,500 tons and the headline result is 12.25 tons, this scenario comes in 49.6% below the baseline at 6.18 tons.
- The practical read: the gap between this scenario and the baseline is entirely attributable to usable stockpile tonnage on hand, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. It assumes a steady daily draw; seasonal demand swings, weather that freezes or floods a pile, and unrecoverable fines mean real cover can differ from the calculated figure.
Results at a glance
- Stockpile Inventory Days: 6.18 tons (headline result)
- Unprotected stockpile inventory days: 7.41 days
- Usable stockpile inventory days inventory: 6,300 pieces
- Daily stockpile inventory days usage: 850 pieces / day
Run it with your numbers
- To rerun this with your own numbers, open the live Stockpile Inventory Days calculator, set usable stockpile tonnage on hand to your actual value, and adjust the remaining inputs to match your operation.
Last reviewed 2026-05-12.