Copper slides 3.5% intraday as 5 miners face downside risk

COMEX copper futures fell 3.51% to 34.3700 as of 10:00 AM ET, the biggest intraday drop of 2026, after global inventories hit their highest level since 2003.

"Copper inventories now stand at roughly 4.5 weeks of global consumption, the highest stockpile level in more than two decades," according to exchange data compiled by Bloomberg.

The July 22 selloff follows a five-day high of 35.6200 set July 20. The pullback comes as rising stockpiles raise fresh doubts about demand from AI data centers, EVs, and electrification build-outs, sectors that had driven copper's rally through the first half of 2026.

For copper miners, every $0.10 move in the underlying commodity flows almost directly to cash flow. If COMEX copper breaks below the July 15 low of 33.4100, the pain will not fall evenly across producers, with high-cost names facing the most immediate margin pressure.

Ero Copper and Freeport Lead Downside Exposure

Ero Copper (ERO) carries the highest cost structure among the group, with full-year C1 cash costs guided at $2.15 to $2.35 per pound and net debt of $490.7 million against a $2.86 billion market cap. The company missed Q1 revenue estimates by $79 million, reporting $263.2 million against the Street's $341.8 million consensus. Shares trade at a forward P/E of 6x with a beta of 1.584, making Ero the most cost-sensitive name in the group.

Freeport-McMoRan (FCX), the largest US-listed pure-play copper producer at a $92.36 billion market cap, faces a different constraint. Management has flagged that every $0.10 per pound move in copper materially shifts cash flow across its 3.1 billion pound annual sales base. Q1 revenue rose 12.2% to $6.23 billion on realized copper of $5.78 per pound, but the Grasberg mine's mud rush limits production to roughly 65% of capacity through the second half of 2026. Options positioning skews defensive, with the full-chain put/call ratio at 0.82 and the August 21 expiration running an outsized 6.28. Shares are down 8.8% over the past month.

Teck, Hudbay, and Southern Copper: Different Buffers

Teck Resources (TECK) has been the weakest performer, down 5.43% in the past week and 11.7% over the past month. Q1 revenue jumped 72.2% to $2.78 billion on record copper sales of 155,100 tonnes, but the pending Anglo American merger layers regulatory risk on top of commodity risk. Guided 2026 net cash costs of $1.85 to $2.20 per pound leave less cushion than low-cost peers.

Hudbay Minerals (HBM) is partially insulated by gold by-product credits, which contribute 39% of gross revenue. Consolidated cash costs came in at negative $1.80 per pound of copper in Q1, far below the guided range of negative $0.30 to negative $0.10, with realized gold at $4,468 per ounce doing the heavy lifting. Q1 revenue rose 27.3% to $757.3 million, and 22 of 23 covering analysts rate the stock Buy or Strong Buy. Still, with a beta of 2.252, HBM trades violently on copper headlines.

Southern Copper (SCCO) is best positioned to absorb the drop. Q2 operating cash cost per pound collapsed to $0.05 from $0.63 a year earlier on by-product credits and higher grades at legacy mines. Revenue jumped 40.6% to $4.29 billion, with adjusted EBITDA margin of 66.6%. At a $156.86 billion market cap and forward P/E of 39x, valuation is stretched, but the operating profile means SCCO stays profitable through moves that would pressure higher-cost peers.

The bull case — S&P Global's projected 42 million tonnes of copper demand by 2040 — remains intact. Whether the trade holds through inventory overhang and softer near-term demand is the question worth watching.

This article is for informational purposes only and does not constitute investment advice.