〔Overnight Brief〕LME Aluminum Hits Two-Month Low at $3,169.50 as Zinc Drops Over 1% to $3,824.5 — Yet Chile's August Copper Output Falls 12.78% y/y: Demand Trades, Supply Ignored

0. Overnight Arc

Industrial metals traded soft across the overnight session. LME three-month aluminum hit a fresh two-month low at $3,169.50/ton, down 1.4% on the session ^[1][2], and LME zinc's main contract lost more than 1% to $3,824.5/ton ^[3]. Against that tape, Chile's August copper production printed -12.78% y/y ^[4][5] - a supply drawdown the LME is not yet rewarding. Separately, Rio Tinto, the Tasmanian government and the Australian federal government have locked the Bell Bay aluminum smelter into operation through 2031 ^[6]. Net: demand-side pressure is setting the price; the supply-side print is being ignored.

1. LME Aluminum and Zinc Tape

• **[NEW] Aluminum:** LME three-month aluminum fell to $3,169.50/ton, the lowest level since July 31, last -1.4% ^[1][2]. The print and timestamp are double-sourced via Gelonghui and Cailian Press ^[1][2].
• **[NEW] Zinc:** LME zinc main contract down more than 1% at $3,824.5/ton ^[3]. Single source (Tonghuashun live feed) ^[3].

2. Chile Copper Supply

• **[NEW] Chile August copper output, -12.78% y/y:** per Chile's National Statistics Institute, the print is a sharp year-over-year contraction ^[4][5]. Double-sourced ^[4][5]. The packet contains no LME copper price quote to pair with the volume print — flag as a known blind spot.

3. Bell Bay Smelter

• **[NEW] Rio Tinto + Tasmania + Australian federal government:** an agreement secures Bell Bay aluminum smelter operations through 2031 ^[6]. Single source ^[6]. Read as a policy backstop on existing capacity, not a fresh supply catalyst.

4. What Decides Next

• Falsifiable test: whether the September Chile production print narrows the y/y deficit, and whether LME copper eventually tracks the supply signal ^[4][5]. The LME aluminum level at $3,169.50/ton and Chile's -12.78% y/y print are the only supply-side anchors in the packet ^[1][2][4][5].
• Source quality control: the zinc tape is single-source ^[3]; the Chile copper print and LME aluminum level are double-sourced ^[1][2][4][5]; the Bell Bay agreement is single-source ^[6]. No LME copper price is provided in the material - quote the supply print, not a price reaction.