A Pakistani concentrate seller marketing a cargo FOB Karachi can watch the LME all week and still be blindsided when the Chinese bids firm sharply or go quiet. The reason usually is not the copper price — it is the LME-SHFE import arbitrage, the relationship between the London and Shanghai exchanges that decides whether importing metal into China makes or loses money on any given day. When the window is open, China pulls units in and smelters compete for feed; when it shuts, the same buyers step back mid-negotiation. In our own concentrate marketing from Pakistan, the state of the arb window is checked before the cargo is offered, not after the bids arrive — this guide explains the mechanics so your desk can do the same.
How the LME-SHFE Import Arb Actually Works
The import window compares what copper is worth inside China against what it costs to land it there. On one side: the SHFE front-month price, stripped of China's 13% import VAT (the rate since the 2019-04-01 VAT reform, per the State Taxation Administration) and converted at the CNY/USD rate. On the other: the landed cost — the LME price, plus the Yangshan import premium, plus freight and insurance. When the VAT-adjusted SHFE side exceeds the landed cost, the window is open: importers profit on every tonne and Chinese buying reaches out into the seaborne market. When it inverts, the window is closed: imports lose money, bonded stocks build in Shanghai, and China's pull on seaborne units weakens. Both exchanges publish daily, so the window can flip within a week — and a currency move alone can flip it with no change in copper demand at all.
What an Open Window Does to Chinese Bids for Feed
Concentrate does not trade on the arb directly — it is priced LME-minus-TC with payable metals, as the concentrate-versus-cathode distinction makes clear. The transmission is through the smelters: an open window and a firm SHFE mean Chinese refined output finds ready buyers, sustaining smelter run-rates and their hunger for feed. In the current market — where the 2026 TC/RC benchmark settled at zero and spot TCs have traded negative — that hunger is already extreme, and an open arb window intensifies the competition for every seaborne cargo. A closed window works the other way: refined metal backs up domestically, maintenance rounds get scheduled, and the bid for feed softens first at the margin — which is exactly where a mid-size Pakistani cargo sits. The daily tell for all of this is the Yangshan copper premium, the visible edge of the same arbitrage.
The FOB Karachi Playbook
For a seller of Pakistani copper concentrates (Cu 15–25%, with Au 1–3 g/MT and Ag 20–60 g/MT payables in the standard export grade) or run-of-mine copper ore, the arb translates into three operating rules. First, time the marketing, not the mining: cargoes offered into an opening window meet Chinese bids that are strengthening day by day; the same cargo offered into a closing window meets buyers who would rather wait. Second, keep the destination book wider than China: Indian, Korean, and Japanese smelters price off the same LME-minus-TC structure but sit outside the SHFE arb, so a closed China window is a routing decision, not a lost sale. Third, fix the pricing basis in the contract — LME cash or LME three-month average with a named quotation period, TC referenced to a named index — so that arb-driven bid swings show up as negotiation leverage rather than contract ambiguity.
Signals to Track Weekly
Five inputs cover the window for a seller's purposes: the daily Yangshan premium (SMM/Mysteel) for import appetite; the SHFE-LME price relationship net of VAT and FX for the window itself; Shanghai bonded-zone stock estimates for the buffer direction; the CSPT quarterly TC guidance and the Fastmarkets TC index for how smelter feed terms are translating; and the ICSG monthly bulletin for the confirming production-consumption balance. A desk that reviews these five each Monday knows which way the China bid is leaning before the week's enquiries go out.
Where Arb Reads Go Wrong
- Comparing SHFE to LME without the VAT leg. The raw price ratio is meaningless — the 13% import VAT sits between the two exchanges, and skipping it flips the apparent sign of the window.
- Forgetting the FX leg. The window runs through CNY/USD; a currency move can open or close it while copper demand is unchanged. Track the ratio, not just the two prices.
- Confusing the cathode arb with concentrate economics. The window prices refined metal. Concentrate follows through smelter demand and TCs — with a lag, and mediated by the payables and penalty terms covered in our smelter-clause guide.
- Assuming the window stays where it is. Arb windows flip within days; a cargo marketed on last month's read meets this week's window.
- Treating SHFE as a hedging venue for a Pakistani exporter. SHFE access for offshore participants is constrained; Pakistani sellers hedge on the LME and read SHFE as a signal, not a venue.
Next step: Review grade specifications and origin documentation for copper concentrates and copper ore, or request a delivered-cost indication quoted LME-minus-TC with a named quotation period for a China or alternative-destination discharge. The Minerals & Mining division lists the full portfolio.
Additional Market Context
The working references are the LME (cash and three-month copper, the global benchmark), the SHFE (the China-domestic leg), SMM and Mysteel for the Yangshan premium and bonded-stock estimates, the China State Taxation Administration for the VAT framework, and the ICSG monthly bulletin for the statistical confirmation. For the concentrate-side translation — TCs, payables, penalties — the Fastmarkets TC index and the CSPT quarterly guidance are the references that turn an arb read into a cargo price.
Last reviewed: 2026-07-09. This post describes the arbitrage mechanics and deliberately quotes no price levels — both exchange legs and the Yangshan premium move daily; run the window calculation with live prints at decision time.
