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Reporting assumptions

These choices persist and are added to shared URLs.

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).

Wafi-Golpu

Morobe Province, Papua New Guinea · Developing · 50.0% ownedUnverified

Same deposit, other owners: NYSE:NEM (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.

Au

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	—	—	—	—
Indicated	472.06 Mt	0.87 g/t	13.22 Moz	30 June 2025
Inferred	227.60 Mt	0.74 g/t	5.43 Moz	30 June 2025
Total Resources	699.66 Mt	0.83 g/t	18.65 Moz	30 June 2025
Proved	—	—	—	—
Probable	380.00 Mt	0.83 g/t	10.20 Moz	30 June 2025
Total Reserves	380.00 Mt	0.83 g/t	10.20 Moz	30 June 2025

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	—	—	—	—
Indicated	310.00 Mt	1.30 g/t	12.96 Moz	30 June 2025
Inferred	140.00 Mt	1.10 g/t	4.95 Moz	30 June 2025
Total Resources	450.00 Mt	1.24 g/t	17.91 Moz	30 June 2025
Proved	—	—	—	—
Probable

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	—	—	—	—
Indicated	310.00 Mt	0.95%	2.94 Mt Cu	30 June 2025
Inferred	188.00 Mt	0.69%	1.29 Mt Cu	30 June 2025
Total Resources	498.00 Mt	0.85%	4.23 Mt Cu	30 June 2025
Proved	—	—	—	—
Probable

Mo

Category	Tonnes (Mt)	Grade (% Mo)	Contained (Mt Mo)	As at
Measured	—	—	—	—
Indicated	310.00 Mt	0.01%	0.03 Mt Mo	30 June 2025
Inferred	140.00 Mt	0.01%	0.01 Mt Mo	30 June 2025
Total Resources	450.00 Mt	0.01%	0.04 Mt Mo	30 June 2025
Proved	—	—	—	—
Probable

Cut-off grade

—

Price assumption

US$1200.00/t

JORC code year

—

Peer benchmark — developing Cu projects (124 with resources)Resource size P84Resource grade P74View 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 · 30 June 2025
Reporting code: SK-1300
Convention: exclusive
Currency assumption: US$
Disagreement flags: 16 rows

Current R&R

Resources

Area	Category	Tonnes (Mt)	Au		Ag		Cu		Mo		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Total	Total Resources	450.00–699.66 Mt

Golpu

Inferred

140.00 Mt

0.62 g/t

2.83 Moz

1.10 g/t

4.95 Moz

0.86%

1.20 Mt Cu

0.01%

0.01 Mt Mo

30 June 2025

Mineral Resources (exclusive of Mineral Reserves) — Other metals / Silver tableUnverified

notes (7)

Source: 20-F: 20-F · published 31 Oct 2025

Ref: Mineral Resources (exclusive of Mineral Reserves) — Other metals / Silver table

SK-1300 — Reporting code of record: SK-1300
excl — Stated Resources are EXCLUSIVE of Reserves — they sit on top of the reserve, so decks quoting inclusive resources will show a larger figure (inclusive = this row + the converted reserve).
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA BLOCK: recomputed contained 2475607.4858 oz vs reported 2475607485.784354500201726644 oz (99.90% disagreement)
QA FIX (claude-agent-qa): printed kg contained was converted with the oz-per-TONNE factor (32,150.75) instead of oz/kg (32.1507) — divided by 1,000. Tonnes/grades verified faithful to print.
QA FIX (claude-agent-qa): document states figures are reported on a 50% basis (Harmony holds 50% of the WGJV) — basis set to attributable.
QA sweep: print-verified

Kerimenge

Indicated

54.06 Mt

0.97 g/t

1.68 Moz

—

30 June 2025

Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New GuineaUnverified

notes (7)

Source: 20-F: 20-F · published 31 Oct 2025

Ref: Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New Guinea

SK-1300 — Reporting code of record: SK-1300
excl — Stated Resources are EXCLUSIVE of Reserves — they sit on top of the reserve, so decks quoting inclusive resources will show a larger figure (inclusive = this row + the converted reserve).
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA BLOCK: recomputed contained 842932.4531 oz vs reported 841352886.9544256222828439553 oz (99.90% disagreement)
QA FIX (claude-agent-qa): printed kg contained was converted with the oz-per-TONNE factor (32,150.75) instead of oz/kg (32.1507) — divided by 1,000. Tonnes/grades verified faithful to print.
QA FIX (claude-agent-qa): document states figures are reported on a 50% basis (Harmony holds 50% of the WGJV) — basis set to attributable.
QA sweep: print-verified

Kerimenge

Inferred

9.60 Mt

0.93 g/t

0.29 Moz

—

30 June 2025

Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New GuineaUnverified

notes (7)

Source: 20-F: 20-F · published 31 Oct 2025

Ref: Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New Guinea

SK-1300 — Reporting code of record: SK-1300
excl — Stated Resources are EXCLUSIVE of Reserves — they sit on top of the reserve, so decks quoting inclusive resources will show a larger figure (inclusive = this row + the converted reserve).
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA BLOCK: recomputed contained 143491.0325 oz vs reported 142781465.5112768614986476367 oz (99.90% disagreement)
QA FIX (claude-agent-qa): printed kg contained was converted with the oz-per-TONNE factor (32,150.75) instead of oz/kg (32.1507) — divided by 1,000. Tonnes/grades verified faithful to print.
QA FIX (claude-agent-qa): document states figures are reported on a 50% basis (Harmony holds 50% of the WGJV) — basis set to attributable.
QA sweep: print-verified

Nambonga

Inferred

48.00 Mt

0.69 g/t

1.03 Moz

—

0.20%

0.09 Mt Cu

—

30 June 2025

Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New GuineaUnverified

notes (7)

Source: 20-F: 20-F · published 31 Oct 2025

Ref: Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New Guinea

SK-1300 — Reporting code of record: SK-1300
excl — Stated Resources are EXCLUSIVE of Reserves — they sit on top of the reserve, so decks quoting inclusive resources will show a larger figure (inclusive = this row + the converted reserve).
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA BLOCK: recomputed contained 532416.3632 oz vs reported 514411945.0980476883536055365 oz (99.90% disagreement)
QA FIX (claude-agent-qa): printed kg contained was converted with the oz-per-TONNE factor (32,150.75) instead of oz/kg (32.1507) — divided by 1,000. Tonnes/grades verified faithful to print.
QA FIX (claude-agent-qa): document states figures are reported on a 50% basis (Harmony holds 50% of the WGJV) — basis set to attributable.
QA sweep: print-verified

Wafi

Indicated

108.00 Mt

1.66 g/t

5.72 Moz

—

30 June 2025

Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New GuineaUnverified

notes (7)

Source: 20-F: 20-F · published 31 Oct 2025

Ref: Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New Guinea

SK-1300 — Reporting code of record: SK-1300
excl — Stated Resources are EXCLUSIVE of Reserves — they sit on top of the reserve, so decks quoting inclusive resources will show a larger figure (inclusive = this row + the converted reserve).
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA BLOCK: recomputed contained 2881992.9224 oz vs reported 2861416444.607890266466930797 oz (99.90% disagreement)
QA FIX (claude-agent-qa): printed kg contained was converted with the oz-per-TONNE factor (32,150.75) instead of oz/kg (32.1507) — divided by 1,000. Tonnes/grades verified faithful to print.
QA FIX (claude-agent-qa): document states figures are reported on a 50% basis (Harmony holds 50% of the WGJV) — basis set to attributable.
QA sweep: print-verified

Wafi

Inferred

30.00 Mt

1.30 g/t

1.29 Moz

—

30 June 2025

Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New GuineaUnverified

notes (7)

Source: 20-F: 20-F · published 31 Oct 2025

Ref: Mineral Resources (exclusive of Mineral Reserves) summary table — Papua New Guinea

SK-1300 — Reporting code of record: SK-1300
excl — Stated Resources are EXCLUSIVE of Reserves — they sit on top of the reserve, so decks quoting inclusive resources will show a larger figure (inclusive = this row + the converted reserve).
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA BLOCK: recomputed contained 626939.5581 oz vs reported 643014931.3725596104420069206 oz (99.90% disagreement)
QA FIX (claude-agent-qa): printed kg contained was converted with the oz-per-TONNE factor (32,150.75) instead of oz/kg (32.1507) — divided by 1,000. Tonnes/grades verified faithful to print.
QA FIX (claude-agent-qa): document states figures are reported on a 50% basis (Harmony holds 50% of the WGJV) — basis set to attributable.
QA sweep: print-verified

Reserves

Area	Category	Tonnes (Mt)	Au		Ag		Cu		Mo		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Total	Total Reserves	380.00 Mt	0.83 g/t	10.20 Moz	—	—	1.23%	4.66 Mt Cu	—	—	30 June 2025	derived from 1 row Probable: Mineral Reserves summary table — Golpu Unverified Evidence record Wafi-Golpu Total Reserve · Au · as at 2025-06-30 Reported figure Area Whole project Basis attributable Ore tonnes (t) 380000000 Grade 0.83 Contained (oz) 10200017.2534 Classification Reserve Source trail 20-F: 20-F Mineral Reserves summary table — Golpu · contributes Probable Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.	—
Golpu	Probable	380.00 Mt	0.83 g/t	10.20 Moz	—	—	1.23%	4.66 Mt Cu	—	—	30 June 2025	Mineral Reserves summary table — GolpuUnverified Evidence record Wafi-Golpu Probable · Au · as at 2025-06-30 Reported figure Area Golpu Basis attributable Ore tonnes (t) 380000000 Grade 0.8300 Contained (oz) 10200017.2534 Classification Reserve Source trail 20-F: 20-F Mineral Reserves summary table — Golpu Published 2025-10-31 Verification Approved; not independently verified · Model extracted QA BLOCK: recomputed contained 5070172.7339 oz vs reported 5100008626.688319294259733690 oz (99.90% disagreement) \| QA FIX (claude-agent-qa): printed kg contained was converted with the oz-per-TONNE factor (32,150.75) instead of oz/kg (32.1507) — divided by 1,000. Tonnes/grades verified faithful to print. \| QA FIX (claude-agent-qa): document states figures are reported on a 50% basis (Harmony holds 50% of the WGJV) — basis set to attributable. \| QA sweep fix: incl_of_res cleared — flag belongs on resource rows only; figures print-verified Copies a pre-filled issue record so you can send it through your normal channel.