Each one in plain English, with the numbers worked through for a shareholder.
28 July 2026drilling result● Neutral
Nexa reported first-half 2026 drilling: 123,455 m in total (99,116 m infill, 24,339 m exploration), with top hits of 5.1 m at 13.93% Zn at Vazante's Conexão Sucuri Norte and 64.7 m at 6.33% Zn, 2.71% Pb and 502.08 g/t Ag at El Porvenir's Integración target. Nexa says the results support potential resource growth and mine-life extension; no resource figures are given. The 2026 exploration drilling plan was raised 12% to 66,805 m from 59,870 m (extra drilling at Namibia and Cerro Pasco), within unchanged guidance. At Aripuanã, no exploration drilling took place and geophysics was deferred to the second half due to operational delays, and the Hilarión drilling (4,000 m planned) was rescheduled for community engagement.
Nexa reported 2025 exploration results: 274,889 m drilled (69,807 m exploration, 205,082 m infill), with highlights such as 16.6 m at 9.63% Zn at Aripuanã's Massaranduba target and 14.2 m at 25.93% Zn at Vazante. Nexa says the results support resource replenishment and mine life extension, and plans 59,870 m of drilling in 2026 (74% in Peru). It also confirms the Otavi and Namibia North divestment completed December 22, 2025, resolving the May 2025 sale agreement; the filing text does not give a final price.
Nexa filed an S-K 1300 technical report summary on its El Porvenir mine in Peru, prepared by SLR Consulting, with effective date December 31, 2020, signed January 15, 2021 and amended October 18, 2021, plus SLR's consent. The visible text is only the table of contents (which lists resource and reserve tables as of Dec 31, 2020), so no resource, reserve or economic figures can be read. It follows the same reformatting pattern as the Aripuanã S-K 1300 report filed in March 2021.
Nexa filed an Aripuanã technical report summary prepared by SLR in the U.S. SEC format (S-K 1300), effective September 30, 2020 and signed January 15, 2021, with SLR's consent. It is a reformatted version of the November 2020 report; the visible text is the table of contents only, so no resource, reserve, capex or economic figures can be read from it.
Nexa filed the full Aripuanã technical report (dated November 17, 2020) with consents from four qualified persons; this is the report announced in the same-day release. The visible text is cover pages and a table of contents, which shows resource and reserve tables dated September 30, 2020, and the actual figures are not in the visible text.
Nexa announced it filed an updated technical report on the Aripuanã zinc project, dated November 17, 2020 and prepared jointly with SLR Consulting (formerly Roscoe Postle Associates). The release gives no figures; it says only that the report was previously announced on October 6, 2020 and is available on the company website, SEDAR and EDGAR.
Nexa released the preliminary economic assessment for Hilarión, due by end-2019 per earlier filings and now delivered in March 2020. It envisions a 16-year underground mine at 10,000 tonnes per day, averaging about 115kt of zinc a year (about 150kt zinc equivalent), with capex of US$585 million, after-tax NPV of US$231 million at 8% and IRR of 15.5%. The filing calls it a conceptual study with no certainty the forecasts will be realized; Nexa says it is still early stage and expects a pre-feasibility study in the medium term, and Hilarión remains 100% held by Nexa Perú (80% owned by Nexa).
Nexa filed the formal technical report on the Hilarión project in Peru (dated February 14, 2020, prepared with Roscoe Postle Associates), along with consents from the qualified persons. This is the report behind the Hilarión economic assessment announced the same day; the visible text is cover pages and table of contents, with no figures of its own.
Nexa filed an independent technical report (dated December 3, 2019, prepared by Roscoe Postle Associates) on its Cerro Lindo mine in Peru, with consents from the four qualified authors. It supports the mine's mineral resource and reserve estimates as of July 31, 2019; the visible text contains only the table of contents and the opening of the summary, so the resource and reserve figures themselves are not shown.
Nexa reported 2019 drilling at the Babaçu target next to Aripuanã, which it calls its best intersection there so far: hole BRAPD000057 hit 257 meters at 3.71% zinc, 1.87% lead and 0.36% copper. Babaçu has an unproven exploration target of 25-45 million tonnes (the filing says this is conceptual, not a mineral resource), and about 8,000 meters of further drilling is planned for 2020; mine production is still expected to start in 2021.
Nexa reported first-half 2019 drilling at its 100%-owned Hilarión zinc project in Peru: 5 directional holes (4,650 meters) extended mineralization about 1 km northeast, narrowing the gap to the El Padrino deposit to 1.5 km. It gave a conceptual exploration target for Hilarión North of 30-120 million tonnes at 3.0-8.0% zinc equivalent, which the filing says is not a mineral resource; a preliminary economic assessment is expected by end of 2019.
This is a companion filing attaching the Atacocha mine technical report (dated March 22, 2019, prepared by RPA) and the qualified-person consents and certificates behind the April 3 announcement. The visible text contains no new figures beyond the report's table of contents and the announced reserve update; the detailed estimates are in the truncated body.
Nexa announced it filed its 2018 annual report (Form 20-F), an updated mineral reserves and resources report as of December 31, 2018, and a technical report for the Atacocha mine. Contained zinc reserves rose to 4,449.0 kt from 3,897.2 kt, which the filing attributes to the positive Aripuanã feasibility study and production decision.
On October 19, 2018 the Board approved construction of the Aripuanã project, following the feasibility study (first-time reserves: 26.2 million tonnes). The study estimates capex of about US$392 million, NPV of US$129 million at 9%, IRR of 15.8%, a 13-year mine life and production starting early 2021; Nexa holds 70% and expects to fund it from cash and operating cash flow. This follows the April 2018 preliminary license, and the installation license is still expected by end of 2018, with Karmin (30%) having one year to decide whether to contribute funding.
Nexa reported its first-half 2018 exploration results: US$36.6 million spent and 147,381 meters of diamond drilling across its Peruvian and Brazilian mines and projects. Highlights include a Cerro Lindo hole with 39.75m at 3.82% zinc, and Aripuanã drilling where five of nine holes hit mineralization, with another 6,000 meters planned for the second half of 2018.
