〔Day Digest〕Zinc Tops Four-Year High on Supply Squeeze, Lithium Reverses 2% as Anhui Logs Super-Large Copper-Gold Find - AI Copper Foil Demand +260% YoY

0. Weekly Arc

The supply story dominates today's tape: zinc printed a more-than-four-year high on tightening supply ^[1], the lithium carbonate main contract reversed from +1% to -2.00% intraday at 157,280 yuan/ton ^[2], and AI-server high-end copper foil demand is tracking +260% YoY at ~24,000 tons ^[3]. Yet China's Anhui Chating discovery flags super-large copper-gold potential at home ^[4], Guinea's CBG plans an alumina refinery by year-end ^[5], and India reopened critical-mineral talks with Zambia ^[6] - testing the durability of the squeeze narrative.

1. Zinc and Lithium: Diverging Tails

• **[NEW] Zinc at four-year high (Bloomberg):** prices advanced on tightening supply, extending a months-long rally ^[1].
• **[NEW] Lithium carbonate flip:** main contract dropped 2.00% intraday to 157,280 yuan/ton, having traded +1% earlier in the session ^[2].
• **[NEW] GFEX warehouse receipts:** lithium carbonate 45,839 lots (+215 d/d), polysilicon 23,940 (flat), industrial silicon 33,559 (flat) ^[7]. Lithium stock build against a price drop - watch the spread between inventory and tape.

2. Copper: AI Demand vs Domestic Supply

• **[NEW] AI-server copper foil (Shanghai Metals Market, via 7x24):** 2026 demand ~24,000 tons, +260% YoY; high-grade foil processing fees up 30-50% since December; ultra-low-profile foil prices +10-30% YTD ^[3]. A Jiangxi Yingtan producer reports 24/7 lines, orders booked through year-end, monthly output >2,000 tons, +30% YoY ^[3].
• **[NEW] Anhui Chating copper-gold (Ministry of Natural Resources):** super-large scale potential; main ore body ~1.2 km long, 1.1 km wide; copper resources estimated to exceed several 50-million-ton-class large deposits, gold resources to exceed 10+ 20-ton-class large deposits; deep ore body not yet fully delineated, with reserves expected to rise further ^[4]. Quote (Hu Xianqi, Director, Geological Survey Admin Div, MNR): "Chating copper-gold is one of our 2026 key exploration projects"; added that China's copper import dependence is high, but domestic exploration potential is large ^[4].
• **[ESCALATED] India-Zambia talks:** New Delhi and Lusaka held a preliminary meeting on Aug 26, with no discussion of the projects that had stalled the dialogue; prior talks deadlocked over a 9,000 sq km mining area granted by Zambia to India last year ^[6]. Two sources, both anonymous ^[6].

3. Alumina and Source Quality

• **[NEW] Guinea CBG:** plans to start alumina refinery construction by year-end ^[5].
• **[ONGOING] Source caveats:** the India-Zambia story is sourced to two unnamed officials and lacks Indian or Zambian government confirmation ^[6]; MNR figures are preliminary, with the deep ore body still open and copper potential framed as "exceeding" not a fixed number ^[4]. Treat both as directionally bullish, not yet quantified.