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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).

PTVI

Indonesia · Producing · 30.5% 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.

Ni

Category	Tonnes (Mt)	Grade (% Ni)	Contained (Mt Ni)	As at
Measured	92.13 Mt	1.21%	1.12 Mt Ni	31 Dec 2025
Indicated	512.46 Mt	1.25%	6.40 Mt Ni	31 Dec 2025
Inferred	395.41 Mt	1.58%	6.24 Mt Ni	31 Dec 2025
Total Resources	1,000.00 Mt	1.38%	13.76 Mt Ni	31 Dec 2025
Proved	326.23 Mt	1.38%	4.49 Mt Ni	31 Dec 2025
Probable	337.70 Mt	1.28%	4.33 Mt Ni	31 Dec 2025
Total Reserves	664.26 Mt	1.33%	8.81 Mt Ni	31 Dec 2025

Co

Category	Tonnes (Mt)	Grade (% Co)	Contained (Mt Co)	As at
Measured	48.52 Mt	0.10%	0.05 Mt Co	31 Dec 2025
Indicated	301.64 Mt	0.12%	0.36 Mt Co	31 Dec 2025
Inferred	68.20 Mt	0.10%	0.07 Mt Co	31 Dec 2025
Total Resources	418.36 Mt	0.11%	0.48 Mt Co	31 Dec 2025
Proved	197.38 Mt	0.12%	0.24 Mt Co	31 Dec 2025
Probable

Cut-off grade

—

Price assumption

US$13376.00/t · US$33833.00/t · US$39125.00/t · US$17625.00/t

JORC code year

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Peer benchmark — producing Ni projects (17 with resources)Resource size P97Resource grade P68View 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

Area	Category	Tonnes (Mt)	Ni		Co		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (% Ni)	Contained (Mt Ni)	Grade (% Co)	Contained (Mt Co)	As at	Source	Provenance
Total	Total Resources	418.36–1,000.00 Mt	1.38%	13.76 Mt Ni	0.11%	0.48 Mt Co	31 Dec 2025

Reserves

Area	Category	Tonnes (Mt)	Ni		Co		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (% Ni)	Contained (Mt Ni)	Grade (% Co)	Contained (Mt Co)	As at	Source	Provenance
Limonite	Proved	197.38 Mt	1.16%	2.29 Mt Ni	0.12%	0.24 Mt Co	31 Dec 2025	Cobalt Mineral Reserves as of December 31 — IndonesiaUnverified Evidence record PTVI Proved · Co · as at 2025-12-31 Reported figure Area Limonite Basis attributable Ore tonnes (t) 197377049.18032786 Grade 0.1200 Contained (t Co) 236852.45901639346 Classification Reserve Source trail 20-F: 20-F Cobalt Mineral Reserves as of December 31 — Indonesia 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: Cobalt Mineral Reserves as of December 31 — Indonesia SK-1300 — Reporting code of record: SK-1300 @ US$ 39,125/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.
Limonite	Probable	234.10 Mt	1.11%	2.60 Mt Ni	0.12%	0.28 Mt Co	31 Dec 2025	Cobalt Mineral Reserves as of December 31 — IndonesiaUnverified Evidence record PTVI Probable · Co · as at 2025-12-31 Reported figure Area Limonite Basis attributable Ore tonnes (t) 234098360.6557377 Grade 0.1200 Contained (t Co) 280918.0327868853 Classification Reserve Source trail 20-F: 20-F Cobalt Mineral Reserves as of December 31 — Indonesia 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
Limonite	Total Reserves	431.80 Mt	1.13%	4.88 Mt Ni	0.12%	0.52 Mt Co	31 Dec 2025	Cobalt Mineral Reserves as of December 31 — IndonesiaUnverified Evidence record PTVI Total Reserve · Co · as at 2025-12-31 Reported figure Area Limonite Basis attributable Ore tonnes (t) 431803278.6885246 Grade 0.1200 Contained (t Co) 518163.9344262295 Classification Reserve Source trail 20-F: 20-F Cobalt Mineral Reserves as of December 31 — Indonesia 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
Saprolite	Proved	128.85 Mt	1.71%	2.20 Mt Ni	—	—	31 Dec 2025	Nickel Mineral Reserves as of December 31 — IndonesiaUnverified Evidence record PTVI Proved · Ni · as at 2025-12-31 Reported figure Area Saprolite Basis attributable Ore tonnes (t) 128852459.01639345 Grade 1.7100 Contained (t Ni) 2203377.049180328 Classification Reserve Source trail 20-F: 20-F Nickel Mineral Reserves as of December 31 — Indonesia 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
Saprolite	Probable	103.61 Mt	1.67%	1.73 Mt Ni	—	—	31 Dec 2025	Nickel Mineral Reserves as of December 31 — IndonesiaUnverified Evidence record PTVI Probable · Ni · as at 2025-12-31 Reported figure Area Saprolite Basis attributable Ore tonnes (t) 103606557.37704918 Grade 1.6700 Contained (t Ni) 1730229.5081967213 Classification Reserve Source trail 20-F: 20-F Nickel Mineral Reserves as of December 31 — Indonesia 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
Saprolite	Total Reserves	232.46 Mt	1.69%	3.93 Mt Ni	—	—	31 Dec 2025	Nickel Mineral Reserves as of December 31 — IndonesiaUnverified Evidence record PTVI Total Reserve · Ni · as at 2025-12-31 Reported figure Area Saprolite Basis attributable Ore tonnes (t) 232459016.39344263 Grade 1.6900 Contained (t Ni) 3928557.37704918 Classification Reserve Source trail 20-F: 20-F Nickel Mineral Reserves as of December 31 — Indonesia 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