1. The LME Copper Grade A Contract Specification
LME copper trades under the official Grade A Copper Cathode contract. Each lot is 25 metric tonnes of Grade A copper cathode conforming to BS EN 1978:1998 (Cu-CATH-1), delivered to an LME-approved warehouse. The contract is priced in US dollars per metric tonne. Trading hours run from 01:00 GMT (electronic) through the open-outcry Ring sessions in London afternoon. Cash settlement is two London business days after trade for the cash contract; 3-month settlement is three months forward.
Physical scrap exporters reference Grade A specifically because it is the global benchmark for refined copper, freely traded and settled in physical metal. Other copper qualities — fire-refined copper, cathode below Grade A — trade at premiums or discounts to the LME Grade A price.
2. Cash vs 3-Month — Why Scrap Uses 3-Month
LME Cash represents settlement two business days forward — essentially spot. LME 3-Month represents settlement three months forward. Physical scrap exporters almost always quote against the 3-month price because the typical scrap trade cycle (contract signature, loading, ocean transit, refinery arrival) takes 30–60 days, and the 3-month price aligns better with the date the refinery actually melts the material.
On most trading days the 3-month price is close to the cash price, separated by a small contango (3M above cash) or backwardation (3M below cash) reflecting forward-curve dynamics. In tight physical markets backwardation widens; in loose markets contango widens. Buyers should know which they are receiving — a 3-month quote in steep backwardation effectively gives the buyer a discount versus cash.
3. The Official Settlement Procedure
Each LME trading day produces a series of Official Prices published at 12:30 GMT during the second Ring session. These prices are the closing bids and offers from the open-outcry Ring trading session and are used globally for invoicing, physical contract settlement and futures margin calculations. The Official Settlement is the single number used to settle expiring futures contracts.
Almost every physical copper scrap quotation in Europe references the Official Settlement of a named trading day — typically the day the contract is signed, or an average of Official Settlements across the loading week. The procedure gives buyer and seller a single, publicly verifiable number to reference, removing dispute over what 'today's LME price' actually was.
4. Reading an LME-Anchored Copper Scrap Quotation
A well-written quotation contains five elements: (1) the LME 3-month or Cash reference and the specific date used, (2) the grade discount expressed either as a percentage or a flat USD/MT differential, (3) the term (CIF named port or FOB Rotterdam), (4) the resulting USD/MT figure, and (5) a validity period (24–48 hours is normal).
Example: 'Millberry, ISRI Barley, 99.95% Cu min, 1/16" and over. Price: 96% of LME 3-Month settlement of 14 May 2026 (USD 9,500/MT) = USD 9,120/MT CIF Nhava Sheva. Valid until close of business 15 May 2026.' The buyer can verify the LME number against the exchange's public data feed, recompute the math and decide on the discount in seconds.
5. How LME Volatility Affects Scrap Contracting
Copper is one of the most volatile base metals. Intraday moves of 1–2% are routine; multi-percent moves on macro news (Federal Reserve decisions, Chinese stimulus, mine strikes) are common. Because scrap quotations are typically valid for only 24–48 hours, buyers must be ready to sign promptly on receipt of an acceptable offer or accept that the LME reference will move under their feet.
In high-volatility periods some buyers prefer average pricing — pricing fixed against the average of LME Official Settlements across a defined window (the loading week, the second half of the month). Average pricing smooths exposure but requires both parties to agree the window before contract signature.
6. The Role of LME Warehouse Stocks
LME-approved warehouses around the world hold physical copper inventory available for delivery against expiring futures contracts. Stock levels are published daily and watched closely as a near-term indicator of physical market tightness. Falling stocks generally precede backwardation widening and tighter scrap discounts; rising stocks generally precede contango widening and looser scrap discounts.
Scrap buyers reviewing the LME stock report weekly gain a useful signal on whether to lock contracts now or wait. A persistent stock draw indicates the refinery side is short of feed — a favourable moment to commit volume. A persistent stock build indicates surplus — a favourable moment to push for a wider grade discount.
7. Common Misconceptions About LME and Scrap
Misconception one: 'The LME price is the scrap price.' No. The LME price is the refined cathode price. Scrap is always quoted at a discount that reflects grade, recovery, freight and margin.
Misconception two: 'I can get a fixed price for the year against today's LME.' No supplier underwrites a 12-month fixed price on LME copper — the volatility risk is too high. Annual contracts cover volume and grade; price is fixed deal-by-deal.
Misconception three: 'Different exporters quote off different reference prices.' Credible European exporters all quote off LME 3-Month or Cash. If an exporter quotes off Shanghai Futures Exchange (SHFE) or COMEX without explanation, ask why — the divergence is usually a re-trade.