China Metals Intelligence — Copper Draws Down on Both Sides of the Boundary

China's copper market reversed its post-holiday inventory build in the week to 22 October, with national social stocks falling 21,500 tonnes while bonded-zone inventory declined a further 3,200 tonnes and Yangshan import premiums approached decade highs. Aluminium recorded its largest post-holiday weekly ingot reduction since 2020, lead tightened across three separate inventory measures, and Indonesian nickel-matte production contracted sharply without comparable movement in Chinese refined stocks.

TL;DR

• Copper national social inventory fell approximately 21,500 tonnes to around 90,000 tonnes, roughly half the 180,000 tonnes held in the same period of 2025.

Copper bonded-zone stocks fell 3,200 tonnes, entirely in Shanghai, so domestic and bonded inventories declined together.

Yangshan registered-warrant premiums averaged $145/t and approached decade highs, while the November import arbitrage stood at a loss of ¥410.53/t.

Aluminium primary ingot inventory fell 53,000 tonnes on the week and 103,000 tonnes over two weeks, the largest reduction for the corresponding post-holiday period since 2020.

Zinc seven-region social inventory fell 1,900 tonnes to 200,200 tonnes, with Guangdong premiums of just ¥15–55/t against the SHFE December contract.

Lead five-region social inventory fell 1,700 tonnes to 44,400 tonnes, SHFE warrants fell 950 tonnes and LME stocks fell 4,900 tonnes.

Indonesian nickel-matte output fell to 16,600 tonnes of contained nickel in September, while Chinese refined plate inventory drew just 602 tonnes to 122,936 tonnes.

One Clear Tightening and Five Other Markets

China's base metals all recorded inventory reductions in the week to 22 October, but the aggregate impression of a tightening complex does not survive examination of the individual mechanisms.

Copper produced the only draw registering across more than one measure, falling on both sides of the customs boundary while premiums for imported cathode rose towards decade highs. Aluminium's reduction was faster in absolute terms but its bonded stocks moved the other way over the same week. Zinc's inventory barely moved and its spot premiums stayed narrow, while lead's decline across three measures was attributed by SMM largely to smelter maintenance and slow secondary restarts rather than to consumption. Nickel and tin both show upstream production difficulty without a corresponding effect downstream.

The Inventory Board

Sources: Shanghai Metals Market, 16 to 22 October 2026. Bases differ and are shown individually: copper's national change is weekly while its Shanghai and Jiangsu figures cover three days, so the regional movements are not components of the national total. For copper bonded inventory only the weekly change is used, because the regional figures and the published national total in the source do not reconcile. Inventory definitions differ by product and region, cover different survey populations and should not be aggregated.

Premiums and treatment charges are quoted in the units and currencies in which SMM publishes them. Physical premiums and the futures import arbitrage measure different things and are not reconcilable to a single figure.

Copper Draws Down on Both Sides of the Boundary

SMM attributes the 21,500-tonne national draw to improved downstream consumption, accelerated warehouse withdrawals and reduced arrivals. All three contribute and the data do not apportion the movement between them, which matters because a draw driven by consumption would persist once deliveries normalise while one driven by arrivals would not.

The national figure conceals two distinct regional mechanisms. Shanghai and Jiangsu destocked on improved withdrawals, while SMM identifies maintenance at nearby smelters as the main reason for Guangdong's 1,300-tonne decline, with arrivals dropping significantly as a result. South China's contribution is therefore a supply constraint rather than evidence of consumption recovery.

Bonded-zone stocks fell 3,200 tonnes, entirely in Shanghai, which SMM attributes to previously arrived material moving into the domestic market. Copper drew down on both sides of the customs boundary this week, which is a broader indication than a domestic draw alone. The qualification is that bonded metal clearing into domestic circulation moves between the two categories, so the pairing describes a tightening balance without quantifying how much was consumed.

Premiums for imported cathode reinforce that reading. Yangshan registered-warrant premiums averaged $145 per tonne against bill-of-lading premiums of $135, with SMM reporting that warrant premiums approached decade highs as available cargoes became scarce. The spread between the two reflects the difference between metal held in warehouse against a warrant and cargo still represented by shipping documents, a distinction of form and immediate availability rather than of customs status.

Import economics nonetheless remained unfavourable, with the November arbitrage at a loss of ¥410.53 per tonne and LME November–December backwardation at $40.45. Scarce nearby availability is supporting premiums while the futures relationship does not reward bringing additional metal into China. Concentrate terms remain separately under pressure at negative $241.51 per dry metric tonne, a measure of smelter economics rather than refined availability.

Aluminium's Fastest Post-Holiday Draw Since 2020

SMM identifies the 53,000-tonne weekly ingot reduction as the largest for the corresponding post-holiday period since 2020. The comparison is specific to that seasonal window rather than an outright five-year record, but it measures the rate of absorption rather than the level, which is the more useful framing after a holiday-distorted fortnight.

The 6063 billet book fell 20,000 tonnes on the week and 39,000 tonnes over two weeks. Reductions across both ingot and billet indicate withdrawal at more than one stage of the domestic chain rather than material migrating between categories. Downstream processing held steady rather than accelerating, with the semis operating rate at 61.7%, suggesting the reduction reflects the balance between arrivals and withdrawals rather than a surge in fabrication.

Bonded ingot inventory rose over the same week, with Guangdong accounting for most of the accumulation. Bonded stocks sit in customs-supervised warehouses and have not entered domestic circulation, so they measure imported metal awaiting clearance rather than domestic availability. The two series moved in opposite directions this week, which distinguishes aluminium from copper.

Zinc Destocks While Lead Tightens on Maintenance

Zinc's 1,900-tonne reduction is modest against a substantial base, and the spot market qualifies it. Guangdong #0 zinc transacted at ¥25,575–25,710 per tonne on 22 October, carrying premiums of ¥15–55 against the SHFE December contract and ¥5 against Shanghai spot, with SMM describing end-use consumption as moderate and buyers purchasing as needed. Premiums this narrow describe restrained nearby demand and do not establish the overall market balance. September refined exports of 70,400 tonnes provided an outlet for domestic production, while concentrate imports fell 17.08% year on year and October refined output is forecast at approximately 564,000 tonnes.

Lead declined across three distinct pools — a domestic survey, exchange-deliverable metal documented through SHFE warehouses, and stocks held outside China. They cannot be summed, though their simultaneous decline is notable. Spot quotations reflected the tightness without being uniform: primary producers quoted premiums of ¥50–100 per tonne on an ex-works basis while secondary refined lead was quoted between parity and ¥75, so recycled material was not consistently commanding a premium.

SMM attributes regional tightness partly to maintenance at primary smelters and slower-than-expected restarts among secondary producers. Because recycling normally provides an alternative source of supply, constraints affecting both channels simultaneously reduce buyers' ability to substitute between them.

Nickel and Tin: Upstream Strain Without Downstream Effect

Indonesian nickel-matte output fell from approximately 21,100 tonnes of contained nickel in August to 16,600 tonnes in September, with October forecast at 15,800 tonnes. Against monthly capacity of roughly 70,900 tonnes, the operating rate fell from around 30% to 23%. The cause is margin pressure rather than operational disruption: the estimated margin on converting nickel pig iron into matte was negative $467 per tonne of contained nickel in the first half of October, with the broader matte production margin at approximately negative $857. Mixed hydroxide precipitate showed comparable strain, with spot prices below $13,000 per tonne against an estimated theoretical cash cost of approximately $14,500 after cobalt credits.

Chinese refined inventories show no comparable tightening. Domestic nickel plate social inventory drew just 602 tonnes to 122,936 tonnes on 16 October, with Shanghai bonded stocks unchanged at 1,900 tonnes, while the Jinchuan premium strengthened from ¥4,150 to ¥4,750. Matte and MHP are intermediate products feeding specific processing routes, principally towards battery materials, while refined plate serves different end uses. The absence of a visible effect is not evidence that none will emerge.

Tin shows a comparable disconnect. Smelter utilisation in Yunnan and Jiangxi stood at 29.36%, broadly unchanged from 29.74% a week earlier, yet September refined imports of 3,890.24 tonnes against exports of 1,318.76 tonnes left China a net importer of 2,571.48 tonnes. Tin ore and concentrate imports of 21,602.54 tonnes contained 6,156.76 tonnes of metal. Visible inventories nonetheless fell, with ingot social inventory down 980 tonnes in the first clean weekly comparison since the National Day closure.

Key Risks

Inventory definitions differ by product, region and survey coverage. Domestic social inventories, bonded-zone stocks, SHFE warrants and LME stocks measure different things and cannot be combined into a single national availability figure. Material clearing customs moves between categories without changing total availability.

Several readings use different comparison bases. Copper's national change is weekly while its Shanghai and Jiangsu figures cover three days, and lead and tin warrant movements are day-on-day. These should not be combined into a single weekly measure.

Inventory reductions driven by reduced arrivals carry different implications from those driven by consumption. Both Guangdong copper and Chinese lead declined partly because of smelter maintenance, and such draws may reverse once the constraint resolves.

Elevated physical premiums alongside a negative import arbitrage describe scarce nearby availability rather than conditions encouraging additional imports. High premiums can also deter downstream purchasing and are not a direct measure of demand strength.

Nickel matte, MHP and refined plate serve different processing routes with different cost structures, as do copper concentrate and refined cathode. Contraction in one does not establish tightness in another.

October production figures for nickel matte and refined zinc are SMM forecasts rather than realised output, and all trade data cover September.

FAQ

Did Chinese copper inventories fall everywhere this week? Both domestic social inventory and bonded-zone stocks declined, which is unusual. The national social figure fell 21,500 tonnes week-on-week and bonded stocks fell 3,200 tonnes, entirely in Shanghai. These are separate pools and should not be added together.

Why do the regional copper figures not sum to the national change? They use different bases. The national figure is week-on-week while the Shanghai and Jiangsu readings compare 22 October with Monday 19 October, covering three days rather than five.

If Yangshan premiums are near decade highs, why is the import arbitrage negative? Physical premiums and the futures arbitrage measure different things. Competition for scarce nearby cargoes supports premiums, while the SHFE–LME relationship determines whether bringing additional metal into China is profitable.

Is aluminium's inventory reduction a record? Not outright. SMM identifies the 53,000-tonne weekly ingot reduction as the largest for the corresponding post-holiday period since 2020, a comparison specific to that seasonal window.

Does falling Indonesian nickel production mean tight nickel supply in China? Not on the current evidence. Chinese refined nickel plate inventory drew only 602 tonnes while Indonesian matte output fell to 16,600 tonnes of contained nickel. Matte and refined plate serve different processing routes.

The Bottom Line

Copper is the week's clearest development and the only metal drawing down across more than one measure. National social stocks fell to roughly half their year-earlier level, bonded inventory fell a further 3,200 tonnes, and Yangshan warrant premiums approached decade highs even as the November import arbitrage remained at a loss. The reversal is occurring alongside tighter availability of imported cathode rather than resting on domestic consumption alone. Whether it continues once smelter maintenance in south China concludes is the question for the next edition: a second consecutive decline across both categories would strengthen the evidence of tightening, though it would not on its own establish that consumption has increased.

Aluminium produced the larger absolute reduction, with a 53,000-tonne weekly ingot draw SMM identifies as the largest for the corresponding post-holiday period since 2020, reinforced by a 20,000-tonne billet decline. Bonded stocks rose over the same week. A reduction of that size cannot be sustained indefinitely, and whether the semis operating rate holds at 61.7% will indicate how much reflects consumption rather than the timing of arrivals.

Nickel remains the most instructive case. Indonesian matte production has fallen to 16,600 tonnes of contained nickel on conversion margins near negative $857, while Chinese refined plate inventory drew only 602 tonnes. Those are different products serving different routes, and the October matte forecast will establish whether the contraction extends — and in time, whether any part of it reaches Chinese refined availability.

Data and source note: Physical market data are from Shanghai Metals Market, covering readings through 16 to 23 October 2026. Comparison bases differ by series and are identified in the tables. For copper bonded inventory only the weekly change is used, because the regional figures and the published national total in the source do not reconcile. Nickel matte production and all trade figures are September monthly data; October nickel matte and refined zinc production figures are SMM forecasts. Inventory series cover different products, regions and survey populations, and domestic, bonded and exchange-warehouse stocks are reported separately and are not aggregated.

Sources

Shanghai Metals Market — national copper social inventory weekly data, 22 October 2026

Shanghai Metals Market — SHFE copper spot weekly review, 23 October 2026

Shanghai Metals Market — Yangshan copper premium and bonded inventory weekly review, 22 October 2026

Shanghai Metals Market — aluminium ingot, billet and bonded inventory data, 22 October 2026

Shanghai Metals Market — zinc, lead, nickel and tin market assessments, 16 to 22 October 2026

Bloodstone Research — China Metals Intelligence: Copper Stocks Rise as Aluminium Draws Down, 16 October 2026

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