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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).

Porgera

Papua New Guinea · Producing · 24.5% 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.

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	35.51 Mt	3.63 g/t	4.08 Moz	31 Dec 2025
Indicated	97.96 Mt	2.68 g/t	8.57 Moz	31 Dec 2025
Inferred	65.31 Mt	1.90 g/t	3.88 Moz	31 Dec 2025
Total Resources	141.63 Mt	2.38 g/t	10.82 Moz	31 Dec 2025
Proved	12.24 Mt	4.07 g/t	1.59 Moz	31 Dec 2025
Probable	44.49 Mt	2.90 g/t	4.12 Moz	31 Dec 2025
Total Reserves	57.14 Mt	3.15 g/t	5.71 Moz	31 Dec 2025

Sub-category rows are as disclosed (no Reserves-treatment netting); the Total rows honour the Resources treatment and Inferred-policy toggles, so components may not sum to the Total.

Dotted tonnes/grade are derived under the active Resources treatment: tonnes are netted of (or grossed by) the reserve tonnage alongside contained, and grade is re-derived as netted contained ÷ netted tonnes — not the published figures.

Cut-off grade

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Price assumption

US$2000.00/oz · US$1500.00/oz

JORC code year

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Peer benchmark — producing Au projects (282 with resources)Resource size P92Resource grade P70View 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: 40-F: 40-F — d833573dex991.htm (AIF exhibit) · 31 Dec 2025
Reporting code: SK-1300
Convention: inclusive
Currency assumption: US$
Disagreement flags: 14 rows

Current R&R

Resources

Area	Category	Tonnes (Mt)	Au		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at	Source	Provenance
Total	Measured	35.51 Mt	3.63 g/t	4.08 Moz	31 Dec 2025	Gold Mineral Resources table — Porgera (24.50%) totalUnverified Evidence record Porgera Measured · Au · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 35510204.08163265 Grade 3.6300 Contained (oz) 4081632.6530612246 Classification Resource Source trail 40-F: 40-F — d833573dex991.htm (AIF exhibit) Gold Mineral Resources table — Porgera (24.50%) total Published 2026-02-27 Verification Approved; not independently verified · Model extracted QA WARN: recomputed contained 1015352.7274 oz vs reported 1000000.0 oz (1.54% disagreement) Copies a pre-filled issue record so you can send it through your normal channel.

Total

Inferred

65.31 Mt

1.90 g/t

3.88 Moz

31 Dec 2025

Gold Mineral Resources table — Porgera (24.50%) totalUnverified

notes (5)

Source: 40-F: 40-F — d833573dex991.htm (AIF exhibit) · published 27 Feb 2026

Ref: Gold Mineral Resources table — Porgera (24.50%) total

SK-1300 — Reporting code of record: SK-1300
@ US$ 2,000/oz — Metal price assumption used to derive this estimate.
inc — Stated Resources are inclusive of Reserves. Set Resources: Excl. Reserves to net them out.
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA WARN: tonnes/contained equal the SUM of 2 sibling row(s) of the same classification/category/commodity (surface, underground) — likely a printed multi-deposit rollup/subtotal. Policy keeps leaf rows and printed whole-project Totals only; reject mid-level rollups (double-count). QA INFO: recompute differs 2.88% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±5.76% (rounding granularity) — treated as reconciled.

Reserves

Area	Category	Tonnes (Mt)	Au		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at	Source	Provenance
Total	Total Reserves	57.14 Mt	3.15 g/t	5.71 Moz	31 Dec 2025	Gold Mineral Reserves table — Porgera (24.50%) totalUnverified Evidence record Porgera Total Reserve · Au · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 57142857.14285714 Grade 3.1500 Contained (oz) 5714285.714285715 Classification Reserve Source trail 40-F: 40-F — d833573dex991.htm (AIF exhibit) Gold Mineral Reserves table — Porgera (24.50%) total Published 2026-02-27 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA WARN: cross-category subtotal — this whole-project total_reserve row equals the probable category value while proved rows exist (an M&I/P&P-style total excluding proved — t24 LUN / t25 GMIN-IMG class). Reject the subtotal; the full-set total (or leaves) carries the estimate. QA INFO: recompute differs 1.27% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±3.73% (rounding granularity) — treated as reconciled. Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — d833573dex991.htm (AIF exhibit) · published 27 Feb 2026 Ref: Gold Mineral Reserves table — Porgera (24.50%) total SK-1300 — Reporting code of record: SK-1300 @ US$ 1,500/oz — 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: QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA WARN: cross-category subtotal — this whole-project total_reserve row equals the probable category value while proved rows exist (an M&I/P&P-style total excluding proved — t24 LUN / t25 GMIN-IMG class). Reject the subtotal; the full-set total (or leaves) carries the estimate. QA INFO: recompute differs 1.27% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±3.73% (rounding granularity) — treated as reconciled.
surface	Proved	7.35 Mt	2.88 g/t	0.65 Moz	31 Dec 2025	Gold Mineral Reserves tableUnverified Evidence record Porgera Proved · Au · as at 2025-12-31 Reported figure Area surface Basis attributable Ore tonnes (t) 7346938.775510204 Grade 2.8800 Contained (oz) 653061.224489796 Classification Reserve Source trail 40-F: 40-F — d833573dex991.htm (AIF exhibit) Gold Mineral Reserves table Published 2026-02-27 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA WARN: recomputed contained 166669.4702 oz vs reported 160000.00 oz (4.17% disagreement) Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — d833573dex991.htm (AIF exhibit) · published 27 Feb 2026 Ref: Gold Mineral Reserves table
surface	Probable	34.29 Mt	2.28 g/t	2.49 Moz	31 Dec 2025	Gold Mineral Reserves tableUnverified Evidence record Porgera Probable · Au · as at 2025-12-31 Reported figure Area surface Basis attributable Ore tonnes (t) 34285714.28571428 Grade 2.2800 Contained (oz) 2489795.918367347 Classification Reserve Source trail 40-F: 40-F — d833573dex991.htm (AIF exhibit) Gold Mineral Reserves table Published 2026-02-27 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — d833573dex991.htm (AIF exhibit) · published 27 Feb 2026 Ref: Gold Mineral Reserves table
underground	Proved	4.90 Mt	5.85 g/t	0.94 Moz	31 Dec 2025	Gold Mineral Reserves tableUnverified Evidence record Porgera Proved · Au · as at 2025-12-31 Reported figure Area underground Basis attributable Ore tonnes (t) 4897959.183673469 Grade 5.8500 Contained (oz) 938775.5102040817 Classification Reserve Source trail 40-F: 40-F — d833573dex991.htm (AIF exhibit) Gold Mineral Reserves table Published 2026-02-27 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA WARN: recomputed contained 225698.2409 oz vs reported 230000.00 oz (1.87% disagreement) Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — d833573dex991.htm (AIF exhibit) · published 27 Feb 2026 Ref: Gold Mineral Reserves table
underground	Probable	10.20 Mt	4.97 g/t	1.63 Moz	31 Dec 2025	Gold Mineral Reserves tableUnverified Evidence record Porgera Probable · Au · as at 2025-12-31 Reported figure Area underground Basis attributable Ore tonnes (t) 10204081.632653061 Grade 4.9700 Contained (oz) 1632653.06122449 Classification Reserve Source trail 40-F: 40-F — d833573dex991.htm (AIF exhibit) Gold Mineral Reserves table Published 2026-02-27 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — d833573dex991.htm (AIF exhibit) · published 27 Feb 2026 Ref: Gold Mineral Reserves table