〔Overnight Brief〕LME Aluminum Pushes to $3,291 Since Aug 13 as Yinman Mining Restarts, Yet Japanese Q4 Premiums Plunge 18-22% - Futures vs Physical Demand Divergence

0. Overnight Arc

LME three-month aluminum ticked 0.2% higher to $3,291/ton, the highest since August 13 ^[1], while physical demand for Q4 shipments in Japan is being priced sharply lower — producers offered premiums of $310-$325/ton, down 18-22% from the current quarter ^[2]. The futures-physical split is the overnight tension, with Chinese tin supply set to step up ^[3] and Asian alumina still directionally mixed ^[4].

1. LME Aluminum and the $3,291 Mark

• **[NEW]** LME three-month aluminum rose to $3,291/ton, up 0.2% on the session and the highest since August 13 ^[1].
• The print is a single exchange-price tick from a 7x24 data feed ^[1]; European trade will judge whether the level holds.

2. Physical Market: Japanese Q4 Premiums Plunge 18-22%

• **[NEW]** Top global aluminum producers offered Japanese buyers premiums of $310-$325/ton for October-December primary metal shipments, down 18-22% from the current quarter, four sources involved in quarterly pricing talks said ^[2].
• Japan is a major importer of the light metal, and the premiums it agrees to pay each quarter over the LME cash price serve as the regional benchmark ^[2].
• Source quality: pricing is mid-negotiation; final settlement is typically locked late in the prior quarter, so the band is indicative, not final ^[2].

3. Chinese Supply: Yinman Mining Processing Plant Restarts

• **[NEW]** Xingye Yinxin announced its wholly-owned subsidiary Yinman Mining will resume its processing plant (选厂) on September 3, 2026, after receiving approval from the West Ujimqin Banner (西乌旗) emergency bureau following a safety-related shutdown ^[3].
• The mining area is still in rectification; full mining-area resumption remains pending ^[3]. Net: tin-concentrate processing returns, but ore-feed recovery is not yet on the timeline ^[3].

4. Alumina: Mixed Asian Signals

• **[NEW]** Asian alumina fundamentals show Australia spot prices slightly down, while Indonesian deals cleared at high prices and domestic supply remained ample ^[4].
• The item is a question-framed headline without reported numbers; treat as a directional read on regional balances rather than a quantified update ^[4].

5. Cost Frame: Critical Minerals in EVs

• **[NEW]** IEA: critical minerals account for a small share of final product prices, so the cost of diversification could have a limited impact on consumers ^[5].
• Quantitatively, critical minerals make up roughly a quarter of battery-cell costs but only about 3% of the price of an average EV ^[5].

6. What Falsifies the Divergence

• A sustained close above $3,291 on follow-through volume would confirm the futures leg ^[1]; conversely, a Q4 Japanese premium settling below $310/ton or above $325/ton would tighten or break the -18% to -22% band ^[2]. Yinman Mining's mining-area restart timeline, not the processing-plant resumption, is the cleaner read on Chinese tin concentrate supply ^[3].