Valuation Structure
Contractual valuation of unrefined metallic ores and industrial minerals depends on dry metric ton unit concentrations, moisture content, and chemical purity grade. Commercial transactions in bulk mineral pricing establish baseline settlements through benchmark index assessments published by price reporting agencies. Base grade definitions specify minimum metal percentages alongside maximum allowable limits for deleterious penalty elements like silica, alumina, phosphorus, and moisture.
Standard trading terms exclude refined metal cathodes and fabricated products.
Impurity Adjustment
Penalty schedules reduce the final payable invoice price when delivered shipments contain moisture or unwanted elements above agreed contract limits. Smelters charge deduction fees per dry metric ton unit for excess silica or moisture because higher slag volumes increase energy consumption during furnace processing. Moisture deductions account for water weight in transit, converting wet weight receipts into dry payable tonnage.
Premiums reward shipments exceeding minimum metal grades, compensating miners for higher furnace yields. Spot transactions reflect immediate regional supply imbalances, while long-term off-take agreements tie pricing to monthly average index calculations. Market participants monitor freight differentials between major export harbors and discharge ports to calculate netback realizations.
Re-sampling procedures resolve discrepancies between loading port assay certificates and discharge port laboratory analyses.
Contractual Benchmark
Index settlements provide transparent pricing mechanisms for long-term supply arrangements across international ocean trades. Annual pricing negotiations rely on quarterly index averages to balance spot price volatility against miner revenue stability.