Ore Processing — Cost Transferred to Concentrate Inventory
Recording the cost of processing ore through a concentrator or processing plant to produce metal concentrate.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Concentrate Inventory | Asset (+) | 3,200,000.00 | - |
| Ore Stockpile Inventory (Processed) | Asset (-) | - | 1,800,000.00 |
| Processing Costs (Transferred to Inventory) | Expense (-) | - | 1,400,000.00 |
💡 Accountant's Note
As ore is fed from the stockpile through the processing plant (crushing, grinding, flotation, leaching), processing costs accumulate and the ore's metal content is concentrated into a saleable product (copper concentrate, gold doré, iron ore pellets). The cost of the concentrate is the ore cost plus processing costs, divided by the tonnes of concentrate produced. The ore stockpile is reduced and concentrate inventory is created.
Practitioner & Systems Framework
💻 ERP Architecture
Processing costs are tracked in the plant operating cost centres (power, reagents, maintenance, labour). The process converts ore tonnes to concentrate tonnes at a specific recovery rate. The total cost transferred to concentrate inventory includes: ore cost (from stockpile) + processing costs (plant operating costs). The cost per tonne of concentrate is the primary inventory valuation metric. For operations where processing and mining are performed by different contractors or entities, the transfer pricing between stages must be at arm's length. The production module tracks input tonnes (ore feed), output tonnes (concentrate), and metal recovery (percentage of in-situ metal recovered in concentrate).
⚠️ Audit Flags
Auditors test the ore-to-concentrate conversion at the plant. Confirm the recovery rate applied is consistent with the plant's actual metallurgical performance data — overestimating recovery reduces COGS (beneficial) but may overstate inventory value. Test that processing costs are fully captured before the cost per tonne is calculated. Review the allocation of shared plant costs between different ore types or product streams if the plant processes multiple products. Confirm the concentrate inventory quantity against dispatch and sales records.
📄 Required Documentation
Plant production report (ore feed tonnes, concentrate produced, metal recovery rate), processing cost centre report, concentrate assay certificates (metal grade confirmation), cost per tonne of concentrate calculation, ore stockpile consumption record, concentrate dispatch records, and metallurgical reconciliation report.
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