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Reporting assumptions

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Ownership basis

Show the full project inventory before ownership adjustment.

Display scale

Display contained quantities in millions of ounces or tonnes.

Resource treatment

Normalise Resources to exclude Reserves: where a project is flagged inclusive, net Reserves out of Resources so the figure is additional Resources beyond Reserves. Unknown-convention rows are shown as stated.

Resource total

Total Resource includes Inferred (JORC convention). Totals are re-derived from category rows wherever the document discloses them.

Recovery basis

Show the issuer's headline recoverable figure as reported. Lithium-brine reserves already have the brine-processing recovery factor applied; everything else is shown as stated.

Commodity view

Primary view: each commodity in its own contained unit (oz / t).

Mariana

Brazil · Producing · 100.0% ownedUnverified

Current R&R by category

Whole-project rollup at the latest vintage per category: printed project-level rows are preferred, and mining areas are summed (tonnes-weighted grade) only where the issuer prints no project-level row. Per-area and per-source detail in the Current R&R table below.

Category	Tonnes (Mt)	Grade (% Fe)	Contained (Mt Fe)	As at
Measured	2,958.40 Mt	41.20%	1,218.86 Mt Fe	31 Dec 2025
Indicated	2,694.00 Mt	39.80%	1,072.21 Mt Fe	31 Dec 2025
Inferred	2,654.80 Mt	39.60%	1,051.30 Mt Fe	31 Dec 2025
Total Resources	8,307.20 Mt	40.23%	3,342.37 Mt Fe	31 Dec 2025
Proved	419.40 Mt	52.70%	221.02 Mt Fe	31 Dec 2025
Probable	308.20 Mt	53.30%	164.27 Mt Fe	31 Dec 2025
Total Reserves	727.60 Mt	53.00%	385.63 Mt Fe	31 Dec 2025

Cut-off grade

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Price assumption

US$92.30/t · US$84.30/t

JORC code year

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Peer benchmark — producing Fe projects (34 with resources)Resource size P93Resource grade P40View on grade-tonnage chart →

Percentile of this project's current total Resource among covered peers (P100 = largest / highest grade). Basis and Inferred toggles apply.

Data quality

Latest source: 20-F: 20-F · 31 Dec 2025
Reporting code: SK-1300
Convention: exclusive
Currency assumption: US$

Current R&R

Resources

Category	Tonnes (Mt)	Fe		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (% Fe)	Contained (Mt Fe)	As at	Source	Provenance
Measured	2,958.40 Mt	41.20%	1,218.86 Mt Fe	31 Dec 2025	Iron Ore Mineral Resources as of December 31 — Southeastern SystemUnverified Evidence record Mariana Measured · Fe · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 2958400000.0000 Grade 41.2000 Contained (t Fe) 1218860800.0000 Classification Resource Source trail 20-F: 20-F Iron Ore Mineral Resources as of December 31 — Southeastern System Published 2026-03-27 Verification Approved; not independently verified · Model extracted AGENT-QA 2026-07-11 (t6 recovery first gate, operator-delegated): post-#133 re-extraction verified - structure, single as-at vintage, reported basis and spot-checks against the printed tables. Approved. Copies a pre-filled issue record so you can send it through your normal channel.

Reserves

Category	Tonnes (Mt)	Fe		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (% Fe)	Contained (Mt Fe)	As at	Source	Provenance
Proved	419.40 Mt	52.70%	221.02 Mt Fe	31 Dec 2025	Iron Ore Mineral Reserves at December 31 — Southeastern SystemUnverified Evidence record Mariana Proved · Fe · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 419400000.0000 Grade 52.7000 Contained (t Fe) 221023800.0000 Classification Reserve Source trail 20-F: 20-F Iron Ore Mineral Reserves at December 31 — Southeastern System Published 2026-03-27 Verification Approved; not independently verified · Model extracted AGENT-QA 2026-07-11 (t6 recovery first gate, operator-delegated): post-#133 re-extraction verified - structure, single as-at vintage, reported basis and spot-checks against the printed tables. Approved. Copies a pre-filled issue record so you can send it through your normal channel.	notes (3) Source: 20-F: 20-F · published 27 Mar 2026 Ref: Iron Ore Mineral Reserves at December 31 — Southeastern System SK-1300 — Reporting code of record: SK-1300 @ US$ 84.3/t — Metal price assumption used to derive this estimate. QA notes: AGENT-QA 2026-07-11 (t6 recovery first gate, operator-delegated): post-#133 re-extraction verified - structure, single as-at vintage, reported basis and spot-checks against the printed tables. Approved.
Probable	308.20 Mt	53.30%	164.27 Mt Fe	31 Dec 2025	Iron Ore Mineral Reserves at December 31 — Southeastern SystemUnverified Evidence record Mariana Probable · Fe · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 308200000.0000 Grade 53.3000 Contained (t Fe) 164270600.0000 Classification Reserve Source trail 20-F: 20-F Iron Ore Mineral Reserves at December 31 — Southeastern System Published 2026-03-27 Verification Approved; not independently verified · Model extracted AGENT-QA 2026-07-11 (t6 recovery first gate, operator-delegated): post-#133 re-extraction verified - structure, single as-at vintage, reported basis and spot-checks against the printed tables. Approved. Copies a pre-filled issue record so you can send it through your normal channel.	notes (3) Source: 20-F: 20-F · published 27 Mar 2026 Ref: Iron Ore Mineral Reserves at December 31 — Southeastern System
Total Reserves	727.60 Mt	53.00%	385.63 Mt Fe	31 Dec 2025	Iron Ore Mineral Reserves at December 31 — Southeastern SystemUnverified Evidence record Mariana Total Reserve · Fe · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 727600000.0000 Grade 53.0000 Contained (t Fe) 385628000.0000 Classification Reserve Source trail 20-F: 20-F Iron Ore Mineral Reserves at December 31 — Southeastern System Published 2026-03-27 Verification Approved; not independently verified · Model extracted AGENT-QA 2026-07-11 (t6 recovery first gate, operator-delegated): post-#133 re-extraction verified - structure, single as-at vintage, reported basis and spot-checks against the printed tables. Approved. Copies a pre-filled issue record so you can send it through your normal channel.	notes (3) Source: 20-F: 20-F · published 27 Mar 2026 Ref: Iron Ore Mineral Reserves at December 31 — Southeastern System