Cost of Sales — Mineral Concentrate Sold
Recognizing the cost of concentrate inventory sold to the smelter.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Cost of Sales — Mineral Concentrate | Expense (+) | 8,200,000.00 | - |
| Concentrate Inventory | Asset (-) | - | 8,200,000.00 |
💡 Accountant's Note
The cost of mineral concentrate sold is the accumulated production cost per tonne (mining costs + processing costs + amortisation of mine assets) allocated to the tonnes sold. COGS is recognised simultaneously with revenue on the shipment date (or delivery date). The cost includes the UoP amortisation component — this means the non-cash amortisation of the mine development asset is part of COGS and must be disclosed separately.
Practitioner & Systems Framework
💻 ERP Architecture
COGS is computed in the production costing module — the cost per tonne of concentrate is applied to the tonnes of concentrate in each shipment. The cost per tonne aggregates: ore mining cost + processing cost + mine amortisation + stripping activity asset amortisation + allocated site overhead. At period-end, the ending inventory balance is calculated and the movement determines the cost of sales (opening inventory + production costs - closing inventory = COGS). The non-cash component of COGS (UoP amortisation) is disclosed separately as it is a significant item in mining income statements.
⚠️ Audit Flags
Auditors test COGS by reconciling the production cost model to the COGS in the income statement. Confirm the unit cost calculation is correct and consistent with prior periods. Test inventory movements — opening + production costs - closing should equal COGS. For shipments near period-end, test the cut-off — COGS and revenue should be recognised in the same period for each shipment. Review the non-cash COGS component (amortisation) to confirm it matches the amortisation schedule. Test that royalties are presented separately from COGS if they are a government impost rather than a production cost.
📄 Required Documentation
Production cost model (mining + processing + overhead + amortisation per tonne), concentrate inventory movement schedule, COGS calculation by shipment, non-cash COGS component (UoP amortisation), period-end inventory count or measurement, shipment timing documentation for cut-off testing, and COGS reconciliation to management cost report.
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