LME-Approved Warehouses: Metal Delivery, Warrants, and Costs
Quote from chief_editor on June 12, 2026, 5:30 pmHow LME-approved warehouses issue and cancel warrants, how physical delivery against futures works, and what rent and load-out fees mean for the total cost of holding LME metal.
The London Metal Exchange maintains a global network of approved warehouses where metals traded on the exchange can be stored and delivered against LME futures contracts. LME approval is granted at the facility level and requires that the operator meet defined standards for security, insurance, reporting, and minimum load-out rates. LME warrants—electronic title documents registered in the LME's clearing system—are the delivery instrument that connects the physical metal market with the exchange's futures pricing mechanism.
Understanding how LME-approved warehouses function matters for metals traders, producers, and industrial buyers who use LME pricing as a reference or who take or make physical delivery through the exchange system.
What LME Approval Means and How Warrants Are Issued
LME approval is specific to a physical location, not to an operator as a company. A single operator may hold approval for multiple facilities across different countries and ports, each carrying separate approvals for specific metals and specific lot configurations. Approved locations include major trading hubs in Europe, the Americas, and Asia—Rotterdam, Johor Bahru, New Orleans, Detroit, Gwangyang, and others—with the specific list subject to periodic review by the LME.
For a metal to be deliverable on LME contracts, both the producer's brand and the warehouse facility must be LME-registered. Brand registration requires that the metal meets the LME's published specifications for purity, shape, and weight. Copper must meet a minimum purity threshold and be available in standard cathode form. Aluminum must conform to specified alloy composition. Metals from unregistered brands cannot be delivered against LME futures regardless of actual purity.
When metal is deposited in an LME-approved warehouse, the operator issues an LME warrant—an electronic record in the LME's settlement system representing a single lot of metal. Standard lot sizes vary by metal: 25 tonnes for copper, 25 tonnes for aluminum, 6 tonnes for nickel. Each warrant identifies the metal brand, lot number, warehouse location, and weight. The holder of a warrant has the legal right to demand physical load-out of that specific lot from the named facility.
Warrant Trading and Physical Delivery
LME warrants trade informally in the inter-dealer market—the warrant market—which operates separately from the LME futures exchange. Traders can buy and sell warrants to transfer title to specific metal lots without those lots moving physically. This allows metal to be sold and resold between traders while remaining in place in the warehouse, with the warehouse receipt system tracking ownership changes.
Physical delivery against an LME futures position occurs when a short position holder tenders warrants into the LME clearing system on a designated delivery date and a long position holder is allocated those warrants. The long holder then has two options: sell the warrants forward in the warrant market, or cancel them by requesting physical load-out from the warehouse.
Warrant cancellation triggers the load-out process. Once cancelled, the warrant ceases to exist as an exchange document and the metal must be collected within a defined period. The warehouse charges a load-out fee for each tonne removed, in addition to the daily rent that has accumulated since the metal was deposited. These costs are significant on large positions held for extended periods.
Load-out rate requirements are set by the LME to prevent warehouse operators from restricting deliveries to maintain high occupancy and rent income. The LME minimum load-out rules were strengthened after the 2012 to 2014 period, when load-out queues at certain aluminum warehouses extended to more than a year, creating a large physical premium—the Metro premium in Detroit being the most publicized example—between LME warrant metal and spot physical metal available without a queue. For buyers of physical aluminum who used LME pricing as a reference, this queue premium added materially to the actual cost of metal.
For industrial buyers who use LME pricing as a contract reference—copper fabricators, aluminum extruders, zinc die-casters—understanding the relationship between the LME cash price, the physical premium over LME, and warehouse rent and load-out costs determines the true delivered cost of metal relative to the exchange benchmark. The LME price is not the cost; it is the base from which the actual cost is calculated.
How LME-approved warehouses issue and cancel warrants, how physical delivery against futures works, and what rent and load-out fees mean for the total cost of holding LME metal.
The London Metal Exchange maintains a global network of approved warehouses where metals traded on the exchange can be stored and delivered against LME futures contracts. LME approval is granted at the facility level and requires that the operator meet defined standards for security, insurance, reporting, and minimum load-out rates. LME warrants—electronic title documents registered in the LME's clearing system—are the delivery instrument that connects the physical metal market with the exchange's futures pricing mechanism.
Understanding how LME-approved warehouses function matters for metals traders, producers, and industrial buyers who use LME pricing as a reference or who take or make physical delivery through the exchange system.
What LME Approval Means and How Warrants Are Issued
LME approval is specific to a physical location, not to an operator as a company. A single operator may hold approval for multiple facilities across different countries and ports, each carrying separate approvals for specific metals and specific lot configurations. Approved locations include major trading hubs in Europe, the Americas, and Asia—Rotterdam, Johor Bahru, New Orleans, Detroit, Gwangyang, and others—with the specific list subject to periodic review by the LME.
For a metal to be deliverable on LME contracts, both the producer's brand and the warehouse facility must be LME-registered. Brand registration requires that the metal meets the LME's published specifications for purity, shape, and weight. Copper must meet a minimum purity threshold and be available in standard cathode form. Aluminum must conform to specified alloy composition. Metals from unregistered brands cannot be delivered against LME futures regardless of actual purity.
When metal is deposited in an LME-approved warehouse, the operator issues an LME warrant—an electronic record in the LME's settlement system representing a single lot of metal. Standard lot sizes vary by metal: 25 tonnes for copper, 25 tonnes for aluminum, 6 tonnes for nickel. Each warrant identifies the metal brand, lot number, warehouse location, and weight. The holder of a warrant has the legal right to demand physical load-out of that specific lot from the named facility.
Warrant Trading and Physical Delivery
LME warrants trade informally in the inter-dealer market—the warrant market—which operates separately from the LME futures exchange. Traders can buy and sell warrants to transfer title to specific metal lots without those lots moving physically. This allows metal to be sold and resold between traders while remaining in place in the warehouse, with the warehouse receipt system tracking ownership changes.
Physical delivery against an LME futures position occurs when a short position holder tenders warrants into the LME clearing system on a designated delivery date and a long position holder is allocated those warrants. The long holder then has two options: sell the warrants forward in the warrant market, or cancel them by requesting physical load-out from the warehouse.
Warrant cancellation triggers the load-out process. Once cancelled, the warrant ceases to exist as an exchange document and the metal must be collected within a defined period. The warehouse charges a load-out fee for each tonne removed, in addition to the daily rent that has accumulated since the metal was deposited. These costs are significant on large positions held for extended periods.
Load-out rate requirements are set by the LME to prevent warehouse operators from restricting deliveries to maintain high occupancy and rent income. The LME minimum load-out rules were strengthened after the 2012 to 2014 period, when load-out queues at certain aluminum warehouses extended to more than a year, creating a large physical premium—the Metro premium in Detroit being the most publicized example—between LME warrant metal and spot physical metal available without a queue. For buyers of physical aluminum who used LME pricing as a reference, this queue premium added materially to the actual cost of metal.
For industrial buyers who use LME pricing as a contract reference—copper fabricators, aluminum extruders, zinc die-casters—understanding the relationship between the LME cash price, the physical premium over LME, and warehouse rent and load-out costs determines the true delivered cost of metal relative to the exchange benchmark. The LME price is not the cost; it is the base from which the actual cost is calculated.