【Commodity Basics】How Physical Metals Trading Works
Quote from chief_editor on April 17, 2026, 1:18 amHow physical metals trading works: learn LME pricing, TC/RC structure, metal forms and grades, and how traders capture margin in base metals physical trade.
Physical metals trading covers the buying and selling of base metals — copper, aluminum, zinc, lead, nickel, tin — in their physical forms: concentrates, intermediates, and refined products. The market is structured around the London Metal Exchange (LME), which provides the global benchmark price used in almost all physical metals contracts worldwide. Understanding how physical metals trading works requires understanding both the LME pricing mechanism and the complex supply chain through which metal moves from mine to end-user.
Metals are traded at multiple stages of the production process, and each stage has its own pricing structure, contract conventions, and set of participants. The structure from mine to consumer runs through: mining company, smelter or refinery, trader, and end-user such as a manufacturer or wire rod producer.
LME Pricing and How It Applies to Physical Transactions
The LME publishes official prices for each metal at three time points during the trading day: cash, three-month, and fifteen-month forward prices. The three-month price is the most commonly used benchmark for physical transactions. Physical metal contracts express their price as LME three-month plus or minus a differential — where the differential reflects quality, location, form, and current physical market conditions.
For example, copper cathode (the standard refined form, 99.99% purity) delivered into a warehouse in Rotterdam might trade at LME three-month plus USD 90 per metric ton (the physical premium), while copper cathode delivered in Shanghai might trade at LME plus USD 65 per metric ton, reflecting different logistics costs, import duties, and local supply conditions.
The pricing period — also called the quotational period (QP) — is the window over which LME prices are averaged. A standard structure for copper cathode is: average LME three-month closing prices during the calendar month of shipment. For a 1,000 metric ton shipment of copper cathode at LME plus USD 90, if the LME three-month average for the month of shipment is USD 9,200 per metric ton, the final price is USD 9,290 per metric ton, for a total of USD 9.29 million.
Concentrate Trading and the TC/RC Structure
Copper concentrate — the intermediate product that comes directly from a mine, containing roughly 25–35% copper along with impurities — is priced differently from refined metal. Concentrate is not traded at LME plus a premium. Instead, it is priced using a payable structure combined with treatment charges (TC) and refining charges (RC) that compensate the smelter for processing the material.
The formula for copper concentrate pricing is approximately: Payable Metal Value = (LME copper price × payability percentage × copper content) − TC − RC − deductions for impurities. Payability is typically around 96.5% of the copper content, meaning the seller does not receive value for all the copper in the concentrate — the smelter retains a portion as compensation for processing losses.
TC and RC are negotiated between mining companies and smelters, and they fluctuate with global smelting capacity versus concentrate supply. When concentrate supply is abundant and smelters have negotiating power, TC/RC levels rise. When mine supply is tight and smelters compete for feed, TC/RC falls. Benchmark annual TC/RC negotiations between major miners and Chinese smelters — which set a reference level for the industry — have ranged from around USD 80 per dry metric ton and 8 cents per pound in high-supply years to below USD 30 per dry metric ton and 3 cents per pound in tight-supply periods.
For a physical metals trader, the key insight is that margin comes from the differential between benchmark and physical price — driven by location, form, timing, and supply-demand balance — and that each stage of the metals supply chain has its own pricing language and conventions that must be understood separately.
Physical metals trading is built on the LME benchmark, but the actual transaction price is always benchmark plus or minus negotiated differentials that encode the specific economics of each cargo's grade, location, and market timing.
Keywords: how physical metals trading works LME pricing | LME copper price structure, base metals physical trade, TC RC concentrate trading, metal premium discount trade, copper cathode trade explained
Words: 643 | Source: London Metal Exchange (LME) trading rules; Industry knowledge — WorldTradePro editorial research | Created: 2026-04-09
How physical metals trading works: learn LME pricing, TC/RC structure, metal forms and grades, and how traders capture margin in base metals physical trade.
Physical metals trading covers the buying and selling of base metals — copper, aluminum, zinc, lead, nickel, tin — in their physical forms: concentrates, intermediates, and refined products. The market is structured around the London Metal Exchange (LME), which provides the global benchmark price used in almost all physical metals contracts worldwide. Understanding how physical metals trading works requires understanding both the LME pricing mechanism and the complex supply chain through which metal moves from mine to end-user.
Metals are traded at multiple stages of the production process, and each stage has its own pricing structure, contract conventions, and set of participants. The structure from mine to consumer runs through: mining company, smelter or refinery, trader, and end-user such as a manufacturer or wire rod producer.
LME Pricing and How It Applies to Physical Transactions
The LME publishes official prices for each metal at three time points during the trading day: cash, three-month, and fifteen-month forward prices. The three-month price is the most commonly used benchmark for physical transactions. Physical metal contracts express their price as LME three-month plus or minus a differential — where the differential reflects quality, location, form, and current physical market conditions.
For example, copper cathode (the standard refined form, 99.99% purity) delivered into a warehouse in Rotterdam might trade at LME three-month plus USD 90 per metric ton (the physical premium), while copper cathode delivered in Shanghai might trade at LME plus USD 65 per metric ton, reflecting different logistics costs, import duties, and local supply conditions.
The pricing period — also called the quotational period (QP) — is the window over which LME prices are averaged. A standard structure for copper cathode is: average LME three-month closing prices during the calendar month of shipment. For a 1,000 metric ton shipment of copper cathode at LME plus USD 90, if the LME three-month average for the month of shipment is USD 9,200 per metric ton, the final price is USD 9,290 per metric ton, for a total of USD 9.29 million.
Concentrate Trading and the TC/RC Structure
Copper concentrate — the intermediate product that comes directly from a mine, containing roughly 25–35% copper along with impurities — is priced differently from refined metal. Concentrate is not traded at LME plus a premium. Instead, it is priced using a payable structure combined with treatment charges (TC) and refining charges (RC) that compensate the smelter for processing the material.
The formula for copper concentrate pricing is approximately: Payable Metal Value = (LME copper price × payability percentage × copper content) − TC − RC − deductions for impurities. Payability is typically around 96.5% of the copper content, meaning the seller does not receive value for all the copper in the concentrate — the smelter retains a portion as compensation for processing losses.
TC and RC are negotiated between mining companies and smelters, and they fluctuate with global smelting capacity versus concentrate supply. When concentrate supply is abundant and smelters have negotiating power, TC/RC levels rise. When mine supply is tight and smelters compete for feed, TC/RC falls. Benchmark annual TC/RC negotiations between major miners and Chinese smelters — which set a reference level for the industry — have ranged from around USD 80 per dry metric ton and 8 cents per pound in high-supply years to below USD 30 per dry metric ton and 3 cents per pound in tight-supply periods.
For a physical metals trader, the key insight is that margin comes from the differential between benchmark and physical price — driven by location, form, timing, and supply-demand balance — and that each stage of the metals supply chain has its own pricing language and conventions that must be understood separately.
Physical metals trading is built on the LME benchmark, but the actual transaction price is always benchmark plus or minus negotiated differentials that encode the specific economics of each cargo's grade, location, and market timing.
Keywords: how physical metals trading works LME pricing | LME copper price structure, base metals physical trade, TC RC concentrate trading, metal premium discount trade, copper cathode trade explained
Words: 643 | Source: London Metal Exchange (LME) trading rules; Industry knowledge — WorldTradePro editorial research | Created: 2026-04-09