Nexa Resources (NEXA) delivered its strongest operating quarter of the year. Earnings of $0.87 per share beat the $0.60 consensus by 45.0%, and earnings grew 3000.0% year over year. Revenue of $937.13 million rose 22.7% and edged past the $931.95 million estimate by 0.6%. That small revenue beat and large earnings beat tell the story: this was a margin quarter, not a volume quarter. Adjusted EBITDA climbed 62% to $301 million, and margin expanded 7.7 points to 32.1%. Higher zinc prices, which averaged $3,825/t versus $3,466/t in Q2, combined with strong by-product credits to do most of the work. The central tension is that the operating engine is improving just as the bottom line, the cost outlook and the credit profile are moving the other way.

The quality of the beat deserves scrutiny. The headline per-share figure contrasts sharply with a reported net loss of $47 million, down from net income of $98 million in Q2 and $118 million in Q1. The loss reflects a $124 million non-cash impairment on the Brazilian smelters and a $51 million silver-streaming remeasurement. Neither touched cash, and free cash flow turned positive at $73 million after outflows of $10 million in Q2 and $126 million in Q1. Net leverage fell to 1.24x from 1.40x last quarter and 2.21x a year ago. Still, the impairment matters. The call tied it to lower long-term treatment-charge assumptions and a stronger Brazilian real. Management is effectively marking down the earnings power of its Juiz de Fora and Três Marias smelters, not just taking a one-time accounting hit.

Beneath the headline, mining is doing the heavy lifting. Mining EBITDA margin jumped to 52% from 42% in Q2. Aripuanã treated a record 471kt of ore, lifted zinc output 48% sequentially, and averaged 84% utilization before hitting 90% in September. That is the milestone management had promised for the second half, and the CEO now calls Aripuanã "a normal mine." Smelting production rebounded 28% to 159kt as Cajamarquilla recovered from the May fire. The quality of that smelting recovery is weaker, however. Smelting EBITDA margin slipped to 9% from 11%, and smelting cash cost rose 15% sequentially to $1.65/lb. Spot China zinc treatment charges also deteriorated to -$236/t from -$109/t. In plain terms, the tight concentrate market that rewards Nexa's mines is squeezing its smelters.

Guidance reinforced that split. Production and sales volume targets were held, and mining cash cost guidance net of by-products was lowered on stronger credits. Nearly everything else moved against investors:

• 2026 capex rose 10% to $420 million from $381 million, a figure management had reaffirmed in Q1 and Q2.
• Cerro de Pasco project spending increased to $41 million from $31 million.
• Smelting cash cost and conversion cost guidance moved higher.
• Mining run-of-mine cost per tonne guidance was adjusted up.
• Copper output is now expected at the low end of its range on weaker Cerro Lindo grades.
• Cerro de Pasco environmental approvals slipped to March and April 2027 from an earlier first-quarter target.

Phase I mechanical completion remains on track for December. Part of the capex increase is deliberate, aimed at accelerating Aripuanã development for higher 2027 throughput. On the positive side, Cajamarquilla inventory is positioned for seasonally stronger Q4 sales, and sulfuric acid prices are at multi-year highs.

The Boliden transaction is the overriding catalyst, but it brought a cost. The press release says S&P cut Nexa to BB+ from BBB-, taking it below investment grade. The call summary describes the cut as BBB from BBB-. Investors should rely on the release, which also details the consequence. The downgrade obligates a change-of-control tender for the 2028 notes at 101% within 30 days of closing. Fitch's Rating Watch Negative leaves the 2034 and 2037 notes exposed to similar provisions if Fitch also downgrades.

The market has not been rewarding the operational progress. Shares sit at $12.00, down 14.2% since the open after the August report, even though the Boliden deal was announced in that window. The stock is also 7.9% below its 200-day moving average of $13.03. Investor sentiment swung meaningfully, from mildly positive at 0.16 to negative at -0.22. The Earnings Whispers price and AVWAP trend readings are both negative, consistent with that drift.

The bottom line is that Nexa's mines, led by a finally functioning Aripuanã, are generating real cash and rapidly deleveraging the balance sheet. The beat is genuine at the operating level. Bears have legitimate ammunition, however: a smelter impairment rooted in collapsing treatment charges, rising cost and capex guidance, slipping permits, and a sub-investment-grade S&P rating that triggers debt obligations at the Boliden closing. Until the deal closes and smelter economics stabilize, the market appears unwilling to pay for the mining strength alone.