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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).

Samarco

Minas Gerais, Brazil · Producing · 50.0% ownedUnverified

Same deposit, other owners: NYSE:BHP (50.0%) — each filer reports its own statement of the same orebody; figures can differ by convention and as-at date.

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	2,408.00 Mt	38.30%	922.26 Mt Fe	31 Dec 2025
Indicated	1,506.00 Mt	36.80%	554.21 Mt Fe	31 Dec 2025
Inferred	420.00 Mt	37.40%	157.08 Mt Fe	31 Dec 2025
Total Resources	4,334.00 Mt	37.69%	1,633.55 Mt Fe	31 Dec 2025
Proved	232.00 Mt	42.40%	98.37 Mt Fe	31 Dec 2025
Probable	582.00 Mt	42.80%	249.10 Mt Fe	31 Dec 2025
Total Reserves	814.00 Mt	42.70%	347.58 Mt Fe	31 Dec 2025

Cut-off grade

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Price assumption

US$130.20/t

JORC code year

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Peer benchmark — producing Fe projects (34 with resources)Resource size P82Resource grade P29View 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	2,408.00 Mt	38.30%	922.26 Mt Fe	31 Dec 2025	Samarco Iron Ore Mineral Resources as of December 31Unverified Evidence record Samarco Measured · Fe · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 2408000000 Grade 38.3000 Contained (t Fe) 922264000 Classification Resource Source trail 20-F: 20-F Samarco Iron Ore Mineral Resources as of December 31 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	232.00 Mt	42.40%	98.37 Mt Fe	31 Dec 2025	Samarco Iron Ore Mineral Reserves as of December 31Unverified Evidence record Samarco Proved · Fe · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 232000000 Grade 42.4000 Contained (t Fe) 98368000 Classification Reserve Source trail 20-F: 20-F Samarco Iron Ore Mineral Reserves as of December 31 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 (4) Source: 20-F: 20-F · published 27 Mar 2026 Ref: Samarco Iron Ore Mineral Reserves as of December 31 SK-1300 — Reporting code of record: SK-1300 @ US$ 130.2/t — Metal price assumption used to derive this estimate. attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project. 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	582.00 Mt	42.80%	249.10 Mt Fe	31 Dec 2025	Samarco Iron Ore Mineral Reserves as of December 31Unverified Evidence record Samarco Probable · Fe · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 582000000 Grade 42.8000 Contained (t Fe) 249096000 Classification Reserve Source trail 20-F: 20-F Samarco Iron Ore Mineral Reserves as of December 31 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 (4) Source: 20-F: 20-F · published 27 Mar 2026 Ref: Samarco Iron Ore Mineral Reserves as of December 31 SK-1300
Total Reserves	814.00 Mt	42.70%	347.58 Mt Fe	31 Dec 2025	Samarco Iron Ore Mineral Reserves as of December 31Unverified Evidence record Samarco Total Reserve · Fe · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 814000000 Grade 42.7000 Contained (t Fe) 347578000 Classification Reserve Source trail 20-F: 20-F Samarco Iron Ore Mineral Reserves as of December 31 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 (4) Source: 20-F: 20-F · published 27 Mar 2026 Ref: Samarco Iron Ore Mineral Reserves as of December 31