〔Day Digest〕COMEX Copper Drops 2%+ to $6.63/lb and Battery-Grade Lithium Carbonate Falls to 122,900 yuan/t as Fed October Hike Bets Cross 60%, Even as Yunnan Tin Halts Smelting Sept 30 and LME Lead Drains 3,825t - Macro Tightening vs Supply Idiosyncrasies

0. Day Arc

A synchronized metals selloff drove every major base metal, precious metal, and battery-metal contract lower in the Asian session and European open on September 28, 2026 ^[1][2][3][4]. COMEX copper led the slide with a more than 2% drop to $6.63/lb ^[5]; battery-grade lithium carbonate (Mysteel) gave up 5,000 yuan/t to 122,900 yuan/t, while the GFE lithium carbonate main contract fell 5% to 119,860 yuan/t, breaking the 120,000 yuan/t floor ^[6][7]. The pressure was macro, not micro: October Fed hike bets pushed above 60% on resilient US data and stalled US-Iran talks keeping oil firm, with the dollar and Treasury yields capping risk appetite ^[8]. Yet two supply idiosyncrasies — Yunnan Tin's September 30 smelter maintenance and a Bolivia researcher flagging tin's price premium over lithium — went largely unpriced in the spot tape ^[9][10].

1. Macro Backdrop and Dollar Pressure

• **[NEW] October Fed hike bets >60%:** an SHFE-house analyst read cited resilient US data, sticky inflation, and stalled US-Iran talks keeping oil elevated; a high dollar and Treasury yields weighed on base metals risk appetite ^[8]. This matches the directional pressure in equities and precious metals the same session.
• **[NEW] China demand cooling into holiday:** Bloomberg reported copper and other base metals retreated ahead of a weeklong China holiday as traders weighed slower industrial profit growth ^[11]. SMM midday and end-of-day reads confirmed broad selling across SHFE metals and precious metals ^[1][2].
• **[NEW] Precious metals caught in the same flow:** COMEX gold -2.83%, silver -4.44%, platinum -1.62%, palladium -2.88% in the European morning window; SHFE gold -2.86%, SHFE silver -5.08% ^[2].

2. Copper and Base Metals

• **[NEW] COMEX copper -2%+ to $6.63/lb ^[5]; SHFE copper main contract closed -0.7% at 109,440 yuan ^[8].**
• **[NEW] SHFE copper analyst read:** overseas mine end remains fragile, copper concentrate TC continues weak, smelter production pressure rising, some smelters scheduling maintenance; US refined copper tariff still undecided; non-US inventories low, providing downside support, hence the contained 0.7% SHFE drop ^[8]. COMEX copper inventory continued to build with multi-point Eligible inflow ^[12].
• **[NEW] LME inventory mix:** copper -150t, lead -3,825t (sharp drawdown), zinc +1,875t (build), tin -25t, nickel -24t, aluminum flat ^[13]. LME lead nonetheless fell more than 1% to $1,910.5/t ^[14], illustrating that the macro tape overrode a tight visible stock.
• **[NEW] Jinchuan A-grade copper registered at SHFE:** the exchange approved Jinchuan Group's Yongchang Copper unit "JNMC" A-grade (permanent cathode-K) copper, with 400,000 tons of registered capacity, effective immediately for cathode copper futures delivery ^[15]. Adds deliverable supply at a price-relevant venue.

3. Lithium and Battery Metals Selloff

• **[NEW] GFE lithium carbonate main contract -5% to 119,860 yuan/t, breaching 120,000 yuan/t ^[6].** SMM's intraday reads tracked the same tape: lithium carbonate main -4.15% at midday, -5.69% at close ^[1][2].
• **[NEW] Mysteel battery-grade lithium carbonate (early):** -5,000 yuan/t to 122,900 yuan/t, corroborating the futures move ^[7].
• **[NEW] GFE warehouse receipts day-on-day:** lithium carbonate 33,715 lots (+279); polysilicon 24,320 lots (-1,280); industrial silicon 33,243 lots (-341) ^[16]. Lithium stock builds against polysilicon draws suggest divergent near-term fundamentals inside the new-materials complex.
• **[NEW] Lithium-industry corporate flow:** Jiayou International signed a 7-year Burundi spodumene cooperation with SONALEK and Suntial HK, taking exclusive logistics and sales rights ^[17]; Long Pan Technology's Changzhou Liyuan will inject 310 million yuan into Jiangsu Liyuan, raising registered capital to 610 million yuan ^[17].
• **[NEW] Policy backdrop:** MIIT's Electronics Information Department convened a new-type energy storage industry symposium on quality, standards, and industry regulation ^[17].
• **[NEW] Cross-asset spillover:** ChiNext fell more than 3% with battery, communications equipment, and semiconductor sectors leading the drop; copper foil name Tongling Copper Foil slid more than 8% ^[18].

4. Tin: Supply Idiosyncrasy Goes Unpriced

• **[NEW] Yunnan Tin (锡业股份) smelter shutdown:** the company's tin branch will halt production for maintenance starting September 30 to ensure safe, stable, and efficient operation of the tin smelting equipment; duration not specified in the brief ^[9].
• **[NEW] LME tin -1%+ to $53,995/t ^[19]; SHFE tin -1.25% at midday, -0.83% at close ^[1][2] — the supply signal did not decouple tin from the macro selloff.**
• **[NEW] Bolivia strategy memo (single source / academic):** CIDES-UMSA researcher Guillermo Guzmán Prudencio recommended prioritizing tin ($32,000/t) over lithium ($8,000/t), citing the Vinto smelter as a refining asset and contrasting zinc's lack of domestic refining capacity ^[10]. Treat as a policy-proposal datapoint, not a market signal.

5. What Decides Next / Falsifiable Tests

• **Yunnan Tin maintenance start (Sept 30):** the actual scale and duration of the halt will determine whether LME/SHFE tin can decouple from the macro tape ^[9].
• **Jinchuan A-grade copper registration (400,000 tons):** adds deliverable supply at SHFE; watch any shift in SHFE copper warrant economics or basis ^[15].
• **US refined copper tariff decision:** SHFE analysts flagged it as the key near-term driver for copper; non-US inventory tightness provides a downside cushion until it lands ^[8].
• **COMEX copper inventory trajectory:** continued Eligible-driven builds would reinforce the macro-selloff thesis; a reversal would weaken the >60% Fed-hike narrative's grip on copper ^[8][12].
• **Sourcing caveat:** the Bolivia policy memo is single-source academic commentary ^[10]; the >60% Fed October hike read is an SHFE-house view, not an instrument quote ^[8]; the GFE lithium print is corroborated across Mysteel spot and SMM intraday/close ^[6][1][2][7].