The Lode

Three datasets this week, and all three tell the same story: the headline number has stopped being the signal.

Aluminium’s fund net long crossed 150,000 lots while gross long positions fell. Chinese copper inventory drew again, but partly because fewer cargoes arrived. And copper set a record before giving back 3% in the same session on a policy report.

Zinc is the exception, and worth watching for that reason.

When the Headline Stops Being the Signal

Aluminium is the clearest case. Investment-fund net length rose to +150,080.40 lots in the week to 4 September, crossing 150,000. But funds removed 4,035.55 longs while covering 5,169.75 shorts. The position became more net bullish because bearish exposure disappeared faster than bullish exposure, not because the fund category added gross long exposure. Last week the same metal at least added 1,307.03 gross longs. This week even that went.

China’s copper inventory shows the same problem in a different dataset. National stocks fell 1,400 tonnes to 87,500, and at 56,800 tonnes below last year that reads as scarcity. The composition says otherwise: Shanghai built inventory as arrivals improved, while Jiangsu and Guangdong destocked partly because fewer cargoes arrived. SMM expects a rebuild next week as arrivals recover and downstream buyers continue resisting the price.

Copper’s record is the third. Three-month LME copper reached $14,875/t on 10 September and fell roughly 3% to around $14,330/t within the same session, after Reuters reported the White House hesitating over proposed refined-copper tariffs. The US premium fell far enough to make shipments there temporarily uneconomic.

That reversal is diagnostic. Part of the record represented a geographical premium built around the possibility of a future refined-copper tariff, layered on top of genuine mine scarcity at Grasberg, Kamoa-Kakula and across Chile. Mine disruption persists for years. A dislocation premium can unwind in an afternoon, and did.

Zinc is where the headline and the mechanics agree. Chinese seven-region stocks have fallen 51,700 tonnes, or 19.2%, in a fortnight, and funds added 4,667.72 gross longs. The qualification is that shorts rose 3,067.46 too, so the trade is becoming contested rather than one-sided.

LME Positioning Intelligence — Aluminium Passes 150,000 Lots, But Bulls Are Leaving Too

Aluminium crossed 150,000 lots net long entirely through short covering, while gross longs fell for the first time in this sequence.

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China Metals Intelligence — The Inventory Draw Is Splitting From Demand

Zinc and primary aluminium stocks keep falling, but copper premiums are weakening and cast aluminium alloy inventory has built for five straight weeks.

Read the note →

Copper’s Record Rally Has a Missing Buyer

Copper hit $14,875/t six days after investment funds cut net length by 5.2%, then reversed sharply on a tariff report.

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LME Investment Fund Positioning

Positions as at 4 September 2026, in lots.

Only zinc attracted meaningful fresh long exposure. Aluminium’s increase came from shorts leaving, copper lost longs and gained shorts, and nickel attracted almost twice as many new sellers as buyers.

SMM Chinese Physical Market

Source: Shanghai Metals Market, through 10 September except lead. Series cover different products and regions and should not be aggregated.

Aluminium’s two series move in opposite directions: primary ingot drawing, cast alloy building for a fifth consecutive week.

01 — Whether Aluminium’s Short Base Runs Out

Short covering has driven the net long for two weeks and gross longs are now falling. Once the shorts are gone, something else has to replace them.

02 — The US Refined-Copper Tariff Decision

The 10 September report indicated hesitation rather than resolution. A formal deferral would unwind more of the geographical premium; a reversal would rebuild it.

03 — Chinese Copper Inventory

SMM expects a rebuild from 87,500 tonnes as arrivals recover. That would strengthen the case that the latest draw was partly supply-led.

04 — Zinc’s Short Book

Funds added longs and shorts simultaneously. Whether that resolves towards one side will determine whether zinc remains the cleanest positioning signal in the complex.

05 — Cast Aluminium Alloy Inventory

Five weeks of building. The first sustained decline would provide clearer downstream confirmation.

The Bottom Line

A net long can rise while gross longs fall. Inventory can fall because fewer cargoes arrived. A price can set a record on a premium that evaporates the same afternoon.

None of that means the metals are not tight. Grasberg has been impaired for a year, Chilean grades are declining, and Chinese zinc stocks have fallen almost a fifth in two weeks. The supply constraints are real and mostly slow to resolve.

What changed this week is the quality of the confirmation. Funds are not adding conviction outside zinc. Chinese buyers are deferring purchases rather than competing for metal. And the copper reversal showed how quickly a premium built on policy expectation can disappear when the expectation weakens.

The supply thesis stands. The demand and positioning evidence supporting it has thinned.

The Lode is published every Friday by Bloodstone Research, covering global metals, mining markets and the emerging economies that supply them. This document is published by Bloodstone Research for informational and institutional research purposes only. It does not constitute investment advice, an investment recommendation, an offer or solicitation to buy or sell any financial instrument, commodity or security, or a forecast of future performance. Market conditions and data may change without notice. Readers should conduct their own analysis and, where appropriate, seek independent professional advice before making investment decisions.

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