〔Overnight Brief〕Second Fatal Chilean Mine Accident in Nearly Two Weeks Stacks Onto 15-Year-Low 369.5kt August Copper; Sigma Lithium Halts 240kt on Court; LME Zinc Slides to $3,732/t — Supply Perimeter Narrows

0. Supply Arc

Codelco's Radomiro Tomic mine reported a fatal accident Thursday, the second copper-mine death in Chile in nearly two weeks, on top of an August where Chilean copper production already collapsed 13% y/y to 369,500 tonnes — a more-than-15-year monthly low ^[1]. Sigma Lithium paused mining pending an appellate ruling, pushing 240,000 tonnes of guidance out by three months while keeping its 330,000-tonne FY2027 target ^[2]. LME three-month zinc, meanwhile, slid to $3,732/t — the lowest since August 20 — pointing at the demand side ^[3]. The trade is supply tightening into a softer demand tape.

1. Chile: Second Fatal Compounds an Already-Strained Sector

• **[ESCALATED] Codelco — Radomiro Tomic mine:** A worker died at the Radomiro Tomic copper mine, located about 40km (25 miles) north of Calama ^[1]. Cause and circumstances are under investigation; Codelco has not commented ^[1]. This is the second copper-mine death reported in Chile, the world's largest copper producer, in nearly two weeks ^[1].
• **[ESCALATED] BHP — Escondida mine:** A worker died during equipment maintenance at the world's largest copper mine last week, triggering a temporary shutdown that has since been progressively restored ^[1].
• **[NEW] Codelco recovery drag:** Radomiro Tomic also recorded a fatal accident in early 2024, after which Codelco ran safety remediation that limited the mine to about one-third of its haul truck fleet, weighing on the state producer's recovery plan ^[1].
• **[NEW] August Chile copper output:** Down 13% y/y to 369,500 tonnes, a more-than-15-year monthly low, on weather and operational disruptions across multiple large mines ^[1].

2. Sigma Lithium: Court Halt, Guidance Pushed

• **[NEW] Sigma Lithium:** Suspended mining operations pending an appellate court ruling ^[2]. The FY2027 production target of 330,000 tonnes is maintained, but 240,000 tonnes of production guidance has been delayed by three months ^[2].

3. Zinc Slips to Lowest Since August 20

• **[NEW] LME three-month zinc:** $3,732/t, the lowest level since August 20 ^[3].

4. What Would Falsify the Tightening Trade

• The 13% y/y August copper print, the more-than-15-year-low framing, and the two-fatal-in-nearly-two-weeks claim are all sourced to a single dispatch ^[1]. The Radomiro Tomic cause remains under investigation and Codelco has not commented ^[1]. A clean Codelco statement, a Sigma Lithium appellate ruling that lifts the mining halt, or a stronger LME zinc print would reopen supply assumptions ^[1][2][3].