What Is Gold Payability in a Gold Trading Contract? Understanding Settlement Calculations
Gold payability is the percentage of the assayed fine gold content that a buyer or refinery agrees to pay for under a gold trading contract. It determines how much of the gold contained in a shipment is recognised as payable metal when calculating the seller’s settlement.
For example, if a gold shipment contains 10 kilograms of fine gold and the contract specifies 98% metal payability, the buyer calculates payment on 9.8 kilograms of payable gold before applying the agreed gold price and deducting applicable charges.
Understanding gold payability is essential for gold miners, suppliers, exporters, refiners, bullion dealers and institutional buyers. It helps both parties establish the actual value of a shipment, understand settlement deductions and avoid disputes over the final payment.
What Does Gold Payability Mean in a Gold Trading Contract?
Gold payability is a contractual percentage applied to the fine gold content established through an agreed weighing, sampling and assay process. It represents the quantity of gold for which the buyer agrees to compensate the seller.
In gold doré and concentrate transactions, the buyer may not pay for every gram of assayed gold. The contract may allow a deduction to account for refining losses, processing costs or other agreed commercial terms.
For instance, a refinery may accept a shipment containing 90% gold and apply 98% metal payability. This means that the seller receives settlement based on 98% of the fine gold content, rather than the entire assayed quantity.
However, payability is not a universal fixed rate. It depends on the type and quality of gold, the processing arrangement, the buyer, the refinery and the terms negotiated between the parties.
The contract should clearly explain whether payability refers to the percentage of fine gold credited or the percentage of the market price paid. These are different commercial terms and should not be confused.
How Gold Payability Works
Gold payability is calculated after the shipment has been weighed and its gold content established through an agreed assay procedure.
The process generally involves the following stages:
1. Weighing the Gold Shipment
The buyer or receiving refinery establishes the accepted weight of the gold delivered. The contract should specify the weighing procedure, weighing equipment and treatment of packaging or other non-gold material.
For gold doré, the accepted weight is normally established before the material is melted, sampled or processed according to the agreed procedure.
2. Sampling and Gold Assay
A representative sample is taken and analysed to determine the gold content. The assay result establishes the proportion of gold in the shipment.
For example, a 10-kilogram doré shipment assaying at 90% gold contains 9 kilograms of fine gold.
The sampling method matters because an inaccurate or unrepresentative sample can produce an incorrect settlement calculation.
Read more about Gold Authentication and the importance of verifying gold quality before completing a transaction.
3. Calculating Fine Gold Content
Fine gold content is the actual quantity of pure gold contained in the shipment.
It is calculated by multiplying the accepted gold weight by the assay percentage.
Formula:
Fine Gold Content = Accepted Gold Weight × Gold Assay Percentage
For example:
- Accepted shipment weight: 10 kg
- Assayed gold purity: 90%
- Fine gold content: 9 kg
The remaining 1 kilogram represents other metals and impurities in the material.
4. Applying the Payability Percentage
Once the fine gold content has been established, the contractual metal payability percentage is applied.
Formula:
Payable Gold = Fine Gold Content × Metal Payability Percentage
If the shipment contains 9 kilograms of fine gold and the agreed metal payability is 98%, the payable quantity is 8.82 kilograms.
The remaining 2% is not credited as payable gold under that particular contractual arrangement. The contract should explain the commercial basis for this deduction.
5. Applying the Agreed Gold Price
The payable gold quantity is converted into the agreed pricing unit, usually troy ounces or grams, and valued using the benchmark and pricing date specified in the contract.
The agreement should identify whether the transaction uses an LBMA Gold Price, another recognised benchmark or a separately negotiated price.
It should also state the applicable currency, pricing date or quotation period.
6. Deducting Contractual Charges
After calculating the gross payable gold value, the buyer deducts the charges specified in the agreement.
Depending on the transaction, these may include:
- Refining charges.
- Assay and laboratory fees.
- Treatment charges.
- Agreed impurity penalties.
- Transportation and insurance costs, where allocated to the seller.
- Other documented contractual expenses.
Not every transaction includes all these deductions. Each charge should be clearly identified, calculated and supported by the contract.
The remaining amount is the seller’s net settlement.
Gold Payability Calculation Formula
The basic metal-payability settlement formula is:
Net Settlement = (Fine Gold Content × Metal Payability × Agreed Gold Price) − Contractual Deductions
Where:
- Fine gold content is the quantity of pure gold established through the accepted assay.
- Metal payability is the contractual percentage of fine gold credited to the seller.
- Agreed gold price is the benchmark or negotiated price applied to the payable gold.
- Contractual deductions are the charges and penalties expressly permitted by the agreement.
For accurate calculations, the fine gold quantity and gold price must use matching units. For example, kilograms must be converted into troy ounces when the price is quoted per troy ounce.
If a contract separately specifies a price-payability factor, it must be applied as a distinct pricing adjustment. It should not be confused with metal payability or deducted twice.
Worked Example: How to Calculate Gold Payability
Consider a gold exporter delivering 10 kilograms of doré gold to a refinery under a contract with the following terms:
| Settlement detail | Example |
|---|---|
| Accepted gold weight | 10 kg |
| Gold assay | 90% |
| Fine gold content | 9 kg |
| Metal payability | 98% |
| Payable gold | 8.82 kg |
| Agreed gold price | US$3,000 per troy ounce |
| Contractual deductions | US$5,000 |
Step 1: Calculate fine gold content
10 kg × 90% = 9 kg of fine gold.
Step 2: Calculate payable gold
9 kg × 98% = 8.82 kg of payable gold.
Step 3: Convert payable gold into troy ounces
8.82 kg × 32.1507466 = approximately 283.57 troy ounces.
Step 4: Calculate the gross settlement value
283.57 troy ounces × US$3,000 = approximately US$850,710.
Step 5: Deduct contractual charges
US$850,710 − US$5,000 = approximately US$845,710.
The seller’s illustrative net settlement is therefore approximately US$845,710.
This example assumes that the agreed price is paid at 100% of the benchmark for each payable troy ounce and that the US$5,000 represents all applicable deductions. Actual settlements depend on the final assay, pricing terms, exchange rates where relevant and the charges specified in the contract.
Factors That Determine Gold Payability
Gold payability varies between transactions. Buyers and refiners consider several factors when negotiating the percentage of gold content that will be credited to the seller.
Gold Purity and Assay Results
Gold purity directly affects the amount of fine gold contained in a shipment. Higher-purity material generally contains more payable gold per kilogram than lower-purity material of the same weight.
However, purity and payability are not the same. Purity measures the gold content, while payability determines the contractual proportion of that content credited for settlement.
Type of Gold Being Traded
The form in which gold is supplied influences how it is assessed and processed.
- Gold doré: Semi-refined gold that contains gold, silver and other metals. It normally requires further refining before reaching investment-grade purity.
- Gold concentrates: Processed mineral material containing gold and potentially other valuable or undesirable elements. Payability may depend on metal content, treatment requirements and refining terms.
- Gold nuggets: Naturally occurring gold that may contain impurities and require testing or refining.
- Refined gold bars: Finished bullion with a stated fineness, such as 999.9. Transactions involving properly verified refined bars generally use agreed bullion pricing rather than the same doré refining-payability structure.
See Doré vs Refined Gold for a closer explanation of the differences between these products.
Refining and Processing Requirements
Material requiring more processing may attract different commercial terms from material that is easier to refine.
The buyer may consider refining costs, expected processing losses, impurities and the time required to produce saleable gold.
These factors can influence the payability percentage and other settlement charges negotiated in the contract.
Impurities and Other Precious Metals
Doré and gold concentrates may contain silver, copper, iron and other elements.
Some impurities can increase processing costs or attract contractual penalties. On the other hand, silver and other recoverable precious metals may have separate payable-metal provisions.
A seller should check whether the agreement includes a separate silver credit and whether any deductions apply to other elements.
Quantity and Consistency of Supply
The quantity and regularity of deliveries can influence commercial negotiations.
A supplier delivering consistent volumes of well-documented material may have a stronger negotiating position than a seller providing irregular shipments with uncertain composition.
However, higher volumes do not automatically guarantee better payability. The final percentage must be agreed in writing.
Gold Payability vs Gold Purity vs Gold Recovery
These three terms are related but describe different stages of gold valuation and processing.
| Term | Meaning | Importance |
|---|---|---|
| Gold purity | Percentage of gold in a sample or product | Establishes gold content |
| Gold payability | Contractual percentage of fine gold credited to the seller | Determines payable metal |
| Gold recovery | Proportion of gold successfully extracted during processing | Measures processing efficiency |
For example, a shipment may assay at 90% gold, have a contractual metal payability of 98%, and achieve a processing recovery of 99%.
These figures are not interchangeable. The contract must establish whether processing recovery is already reflected in the agreed payability or is treated separately. Otherwise, the same processing loss could be deducted twice.
What Should a Gold Trading Contract Say About Payability?
A properly drafted gold trading contract should explain how payability is established and how it affects the final settlement.
Before signing a gold sales and purchase agreement, both parties should review the following provisions:
1. Agreed Payability Percentage
The contract should state the exact metal-payability percentage and explain how it is applied to the assayed fine gold content.
Avoid relying on verbal promises or general statements such as “high gold payability” without a defined figure.
2. Assay and Sampling Procedure
The agreement should specify who conducts the assay, which laboratory or method is accepted, how samples are prepared and whether the seller can retain a sealed reference sample.
It should also establish the procedure for resolving differences between the buyer’s and seller’s assay results.
3. Gold Pricing Benchmark
The contract should identify the reference price used to value the payable gold.
For example, it may specify an agreed LBMA Gold Price fixing or another clearly identified market reference.
The pricing date, quotation period and currency should be stated.
4. Refining and Treatment Charges
All refining fees, treatment charges and other deductions should be documented.
The seller should understand whether charges are fixed, calculated per kilogram, calculated per payable ounce or determined using another agreed method.
5. Impurity Penalties and Other Metal Credits
The contract should identify the impurities that may attract penalties and the applicable thresholds or calculation methods.
It should also explain whether silver or other recoverable precious metals receive separate settlement credits.
6. Provisional and Final Settlement
Some gold trading agreements provide for provisional payment after preliminary weighing or assay, followed by a final settlement once the definitive assay and pricing information are available.
The agreement should specify the provisional payment percentage, the documents required and when the remaining balance becomes payable.
7. Payment Deadline and Dispute Resolution
The contract should state when payment is due after final settlement and which procedure applies if the parties disagree about the weight, assay, payability or deductions.
An independent umpire assay may be used where the contract provides for it.
Common Gold Payability Mistakes to Avoid
Misunderstanding payability can lead to financial losses and disputes between gold buyers and sellers.
The following mistakes should be avoided:
- Confusing purity with payability: A 95% gold assay does not automatically mean the buyer pays for 95% of the shipment’s total weight. Fine gold must first be calculated, and the contractual payability then applied.
- Accepting an undefined payability percentage: The agreement should state whether the percentage applies to fine gold content or to the benchmark price.
- Ignoring refining charges: A high payability percentage does not necessarily produce a better settlement if the contract includes excessive or unclear deductions.
- Using an unreliable assay: An unrepresentative sample can result in an incorrect gold-content calculation.
- Overlooking the pricing date: Gold prices fluctuate, so the contract should specify when the benchmark price is determined.
- Allowing duplicate deductions: Refining losses, recovery adjustments and payability deductions should be examined to ensure the same cost is not charged twice.
- Ignoring other payable metals: Silver contained in doré may have additional value if the contract provides for separate payment.
Why Gold Payability Matters to Gold Buyers and Sellers
Gold payability affects the commercial value of a shipment and the amount ultimately received by the seller.
For sellers, understanding payability helps with evaluating purchase offers, negotiating refining terms and estimating revenue before delivering gold.
For buyers and refiners, it provides a contractual framework for valuing gold content while accounting for agreed processing and commercial costs.
It also improves transparency because both parties can follow the calculation from accepted weight and assay results to payable gold, benchmark pricing, deductions and final payment.
For international transactions, the settlement calculation should be supported by the appropriate transaction documents. These may include an assay certificate, sales and purchase agreement, commercial invoice, export documentation and payment records.
Read Gold Export Procedures in Africa to understand the documentation and compliance requirements involved in international gold shipments. You can also learn about Gold Traceability and why documenting gold from its source to the buyer is important.
Frequently Asked Questions About Gold Payability
What is a good gold payability percentage?
There is no single payability percentage that applies to every gold transaction. The agreed rate depends on the gold product, assay results, refining requirements, processing costs, market conditions and the negotiating position of both parties. Compare the complete settlement terms rather than looking at the percentage alone.
How is gold payability calculated?
Gold payability is calculated by multiplying the assayed fine gold content by the contractual metal-payability percentage. The resulting payable gold quantity is valued at the agreed gold price, after which applicable contractual charges are deducted.
Is gold payability the same as gold purity?
No. Gold purity measures the proportion of gold contained in a product, while payability determines the contractual proportion of its fine gold content for which the buyer agrees to pay.
Why do gold buyers apply payability deductions?
Buyers or refiners may apply payability terms to account for agreed refining losses, processing economics and other commercial considerations. The basis of the deduction should be explained in the contract.
Does gold payability apply to refined gold bars?
The term is particularly relevant to doré, concentrates and other material requiring further processing. Properly verified refined bullion is more commonly valued using its accepted fine-gold weight and an agreed bullion price, although a contract can still specify separate price or settlement adjustments.
Can gold payability be negotiated?
Yes. Buyers and sellers can negotiate the percentage and associated settlement terms before signing the agreement. The final arrangement should clearly state the payability basis, assay procedure, pricing method and permitted deductions.
What happens if the buyer and seller disagree on the gold assay?
The contract should provide a procedure for resolving assay differences. This may involve comparing sealed samples, using an independent laboratory or appointing an agreed umpire assayer. The agreement should also explain who pays the additional testing costs and which result controls settlement.
Does a higher gold payability percentage always mean a better deal?
Not necessarily. A higher metal-payability percentage may be offset by higher refining charges, lower benchmark pricing or additional deductions. Sellers should compare the net settlement value rather than relying on one contractual figure.
Conclusion
Gold payability is an important part of gold trading because it determines how much assayed fine gold is recognised for payment under a contract. It directly influences the settlement calculation and the final amount received by a gold seller.
Before entering a gold transaction, buyers and sellers should understand the difference between gold purity, fine gold content, metal payability, price adjustments and refining charges. They should also agree on the assay procedure, pricing benchmark, settlement deadline and dispute-resolution mechanism.
A transparent gold trading contract should make every calculation verifiable, from the accepted shipment weight to the final payment. This protects both parties and helps prevent misunderstandings during gold purchases, refining and international trade.
