The Cargo That Passed Inspection Was Not the Cargo That Shipped
Quote from chief_editor on April 8, 2026, 7:11 pmPre-shipment inspection passed but discharge port results differ. How cargo substitution between PSI and loading happens in physical commodity trade.
The discharge port surveyor's report landed on a Wednesday. Iron ore fines, 62% Fe basis, 60,000 MT, CFR Qingdao. The pre-shipment inspection certificate, issued twelve days earlier at the load port in Mozambique, showed Fe content at 62.3%, moisture at 8.1%, and silica within spec. The discharge results came back at 59.7% Fe, moisture at 9.6%, and alumina above the rejection threshold. The buyer invoked the quality rejection clause. The cargo was sitting on the vessel at anchorage, accumulating demurrage at roughly $28,000 per day. The seller pointed to the PSI certificate. The buyer pointed to the discharge survey. Both were technically correct about their own numbers. Neither set of numbers described the same cargo.
This is not a rare event. It is a pattern that repeats across bulk commodity trades — iron ore, manganese ore, chrome concentrate, soybean meal, fertilizers — anywhere there is a gap between the moment a pre-shipment sample is drawn and the moment cargo crosses the ship's rail.
The Window Between Inspection and Loading Is Where the Problem Lives
Most traders treat pre-shipment inspection as a gate. Cargo passes PSI, the certificate is issued, and the transaction moves to the next stage — shipping instructions, bill of lading, LC document presentation. The assumption is that the inspected cargo and the loaded cargo are the same material. In a controlled environment — a sealed warehouse, a dedicated stockpile with no blending activity, a terminal with segregated storage — that assumption can hold. In practice, the conditions are rarely that clean.
At many load ports in sub-Saharan Africa, Southeast Asia, and parts of South America, the time between PSI sampling and actual vessel loading can range from three days to three weeks. During that window, the stockpile sits in open storage. It can be rained on, increasing moisture. It can be blended with lower-grade material to increase volume. It can be partially drawn down for a different buyer's shipment and topped up with whatever is available. The PSI certificate describes a snapshot. The loaded cargo is whatever went through the conveyor belt or grab crane on loading day.
Industry estimates suggest that in trades involving smaller, non-integrated mining operations — particularly in East and Southern Africa — discrepancies between PSI and discharge results occur in roughly 15 to 25 percent of shipments. Not all of these are deliberate substitution. Some are moisture pickup from open storage. Some are blending decisions made by the mine or the port operator to fill a vessel nomination. Some are the result of PSI samples being drawn from a different stockpile than the one actually loaded. The cause varies. The result is the same: the buyer receives cargo that does not match the certificate the seller presented under the LC.
The operational question traders need to answer is specific: who controls the stockpile between PSI completion and vessel loading, and what physical segregation exists during that period? If the answer is that the supplier controls the stockpile, there is no segregation, and blending activity continues on adjacent piles, then the PSI certificate is describing material that may no longer exist in that form by the time it reaches the hold.
The Surveyor Certified What Was Sampled, Not What Was Loaded
There is a second assumption embedded in the first: that the independent surveyor is watching the entire process. In most PSI engagements, the surveyor is contracted to draw samples from a stockpile, prepare and analyze those samples, and issue a certificate. The scope of work ends there. The surveyor is not typically contracted to witness continuous loading — to stand at the conveyor belt or crane for three days confirming that only the inspected material is being loaded. Continuous loading supervision is a separate service. It costs more. It is frequently not included in the inspection contract because the buyer either does not know to request it or does not want to pay for it.
The result is a certificate that accurately reflects a sample drawn at a specific time from a specific location in the stockpile, but says nothing about what happened between that moment and the completion of loading. The surveyor's certificate is not a guarantee of the loaded cargo. It is a record of the sampled material. These are different things, and the distinction matters when a $3.5 million cargo arrives with specs outside the contractual range.
The problem compounds in back-to-back trades. A trader buys FOB from a supplier, sells CFR to an end buyer. The trader relies on the PSI to confirm quality before authorizing loading. The PSI passes. The trader presents documents under the LC. The bank pays. Three weeks later, the discharge survey shows different numbers. The end buyer claims against the trader. The trader turns to the supplier. The supplier points to the PSI certificate and says the cargo was on-spec when inspected. The supplier is not wrong. The cargo may have been on-spec when sampled. It was not on-spec when loaded. But proving what happened in that window — on the supplier's premises, at a port the trader does not control — is a different exercise entirely.
In arbitration, the pattern is consistent. The party that controlled the stockpile between PSI and loading usually has the evidentiary advantage because they control the site, the records, and the personnel. The buyer or trader making the claim has a discharge survey and a discrepancy. Tribunals at GAFTA, the LME, and ad hoc LCIA panels have dealt with variations of this fact pattern repeatedly. The outcome often depends not on whether substitution occurred, but on whether the claimant can prove the chain of custody was broken — and that requires having specified continuous loading supervision in the inspection contract.
For traders operating in corridors where this pattern is known — Mozambique and South Africa to China for iron ore and chrome, Indonesia to India for nickel ore and coal, Brazil and Argentina to Southeast Asia for soybean meal — the cost of continuous loading supervision is typically $800 to $1,500 per day depending on the port and the surveyor. On a 50,000 MT Supramax cargo worth $3 million or more, that supervision cost is a fraction of a percent. The number of traders who include it as standard practice is, in the experience of surveyors who work these routes, well below half.
The PSI certificate is not the problem. The problem is treating it as something it was never designed to be: a guarantee that the inspected material is the material that boarded the vessel. The certificate tells you what was in the pile when the sample was drawn. What went into the hold is a question that only continuous supervision can answer. The traders who have learned this learned it after a discharge survey contradicted a clean PSI report on a cargo they had already paid for — and discovered that the contractual architecture they relied on had a gap precisely where it mattered most.
Keywords: pre-shipment inspection cargo substitution commodity trade | PSI loading gap risk, discharge port quality dispute, cargo quality switching bulk commodities, independent surveyor limitations physical trade
Words: 1162 | Source: Industry pattern — documented across multiple sources | Created: 2026-04-08
Pre-shipment inspection passed but discharge port results differ. How cargo substitution between PSI and loading happens in physical commodity trade.
The discharge port surveyor's report landed on a Wednesday. Iron ore fines, 62% Fe basis, 60,000 MT, CFR Qingdao. The pre-shipment inspection certificate, issued twelve days earlier at the load port in Mozambique, showed Fe content at 62.3%, moisture at 8.1%, and silica within spec. The discharge results came back at 59.7% Fe, moisture at 9.6%, and alumina above the rejection threshold. The buyer invoked the quality rejection clause. The cargo was sitting on the vessel at anchorage, accumulating demurrage at roughly $28,000 per day. The seller pointed to the PSI certificate. The buyer pointed to the discharge survey. Both were technically correct about their own numbers. Neither set of numbers described the same cargo.
This is not a rare event. It is a pattern that repeats across bulk commodity trades — iron ore, manganese ore, chrome concentrate, soybean meal, fertilizers — anywhere there is a gap between the moment a pre-shipment sample is drawn and the moment cargo crosses the ship's rail.
The Window Between Inspection and Loading Is Where the Problem Lives
Most traders treat pre-shipment inspection as a gate. Cargo passes PSI, the certificate is issued, and the transaction moves to the next stage — shipping instructions, bill of lading, LC document presentation. The assumption is that the inspected cargo and the loaded cargo are the same material. In a controlled environment — a sealed warehouse, a dedicated stockpile with no blending activity, a terminal with segregated storage — that assumption can hold. In practice, the conditions are rarely that clean.
At many load ports in sub-Saharan Africa, Southeast Asia, and parts of South America, the time between PSI sampling and actual vessel loading can range from three days to three weeks. During that window, the stockpile sits in open storage. It can be rained on, increasing moisture. It can be blended with lower-grade material to increase volume. It can be partially drawn down for a different buyer's shipment and topped up with whatever is available. The PSI certificate describes a snapshot. The loaded cargo is whatever went through the conveyor belt or grab crane on loading day.
Industry estimates suggest that in trades involving smaller, non-integrated mining operations — particularly in East and Southern Africa — discrepancies between PSI and discharge results occur in roughly 15 to 25 percent of shipments. Not all of these are deliberate substitution. Some are moisture pickup from open storage. Some are blending decisions made by the mine or the port operator to fill a vessel nomination. Some are the result of PSI samples being drawn from a different stockpile than the one actually loaded. The cause varies. The result is the same: the buyer receives cargo that does not match the certificate the seller presented under the LC.
The operational question traders need to answer is specific: who controls the stockpile between PSI completion and vessel loading, and what physical segregation exists during that period? If the answer is that the supplier controls the stockpile, there is no segregation, and blending activity continues on adjacent piles, then the PSI certificate is describing material that may no longer exist in that form by the time it reaches the hold.
The Surveyor Certified What Was Sampled, Not What Was Loaded
There is a second assumption embedded in the first: that the independent surveyor is watching the entire process. In most PSI engagements, the surveyor is contracted to draw samples from a stockpile, prepare and analyze those samples, and issue a certificate. The scope of work ends there. The surveyor is not typically contracted to witness continuous loading — to stand at the conveyor belt or crane for three days confirming that only the inspected material is being loaded. Continuous loading supervision is a separate service. It costs more. It is frequently not included in the inspection contract because the buyer either does not know to request it or does not want to pay for it.
The result is a certificate that accurately reflects a sample drawn at a specific time from a specific location in the stockpile, but says nothing about what happened between that moment and the completion of loading. The surveyor's certificate is not a guarantee of the loaded cargo. It is a record of the sampled material. These are different things, and the distinction matters when a $3.5 million cargo arrives with specs outside the contractual range.
The problem compounds in back-to-back trades. A trader buys FOB from a supplier, sells CFR to an end buyer. The trader relies on the PSI to confirm quality before authorizing loading. The PSI passes. The trader presents documents under the LC. The bank pays. Three weeks later, the discharge survey shows different numbers. The end buyer claims against the trader. The trader turns to the supplier. The supplier points to the PSI certificate and says the cargo was on-spec when inspected. The supplier is not wrong. The cargo may have been on-spec when sampled. It was not on-spec when loaded. But proving what happened in that window — on the supplier's premises, at a port the trader does not control — is a different exercise entirely.
In arbitration, the pattern is consistent. The party that controlled the stockpile between PSI and loading usually has the evidentiary advantage because they control the site, the records, and the personnel. The buyer or trader making the claim has a discharge survey and a discrepancy. Tribunals at GAFTA, the LME, and ad hoc LCIA panels have dealt with variations of this fact pattern repeatedly. The outcome often depends not on whether substitution occurred, but on whether the claimant can prove the chain of custody was broken — and that requires having specified continuous loading supervision in the inspection contract.
For traders operating in corridors where this pattern is known — Mozambique and South Africa to China for iron ore and chrome, Indonesia to India for nickel ore and coal, Brazil and Argentina to Southeast Asia for soybean meal — the cost of continuous loading supervision is typically $800 to $1,500 per day depending on the port and the surveyor. On a 50,000 MT Supramax cargo worth $3 million or more, that supervision cost is a fraction of a percent. The number of traders who include it as standard practice is, in the experience of surveyors who work these routes, well below half.
The PSI certificate is not the problem. The problem is treating it as something it was never designed to be: a guarantee that the inspected material is the material that boarded the vessel. The certificate tells you what was in the pile when the sample was drawn. What went into the hold is a question that only continuous supervision can answer. The traders who have learned this learned it after a discharge survey contradicted a clean PSI report on a cargo they had already paid for — and discovered that the contractual architecture they relied on had a gap precisely where it mattered most.
Keywords: pre-shipment inspection cargo substitution commodity trade | PSI loading gap risk, discharge port quality dispute, cargo quality switching bulk commodities, independent surveyor limitations physical trade
Words: 1162 | Source: Industry pattern — documented across multiple sources | Created: 2026-04-08