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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).

Hidden Valley

Morobe Province, Papua New Guinea · 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.

Au

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	0.70 Mt	0.67 g/t	0.02 Moz	30 June 2025
Indicated	30.87 Mt	1.23 g/t	1.22 Moz	30 June 2025
Inferred	1.82 Mt	1.29 g/t	0.08 Moz	30 June 2025
Total Resources	33.39 Mt	1.22 g/t	1.31 Moz	30 June 2025
Proved	1.63 Mt	0.95 g/t	0.05 Moz	30 June 2025
Probable	17.00 Mt	1.45 g/t	0.79 Moz	30 June 2025
Total Reserves	18.63 Mt	1.41 g/t	0.84 Moz	30 June 2025

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	0.70 Mt	14.53 g/t	0.33 Moz	30 June 2025
Indicated	30.87 Mt	17.73 g/t	17.60 Moz	30 June 2025
Inferred	1.82 Mt	11.09 g/t	0.65 Moz	30 June 2025
Total Resources	33.39 Mt	17.30 g/t	18.58 Moz	30 June 2025
Proved	1.63 Mt	22.69 g/t	1.19 Moz	30 June 2025
Probable

Cut-off grade

0.7000 g/t Au · 0.7000 g/t Ag

Price assumption

US$2349.00/oz · US$2237.00/oz

JORC code year

—

Peer benchmark — producing Au projects (282 with resources)Resource size P43Resource grade P41View 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$

Current R&R

Resources

Category	Tonnes (Mt)	Au		Ag		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	As at	Source	Provenance
Measured	0.70 Mt	0.67 g/t	0.02 Moz	14.53 g/t	0.33 Moz	30 June 2025	Mineral Resources (exclusive of Mineral Reserves) summary table / Hidden Valley Mineral Resource EstimateUnverified Evidence record Hidden Valley Measured · Au · as at 2025-06-30 Reported figure Area Whole project Basis 100% Ore tonnes (t) 703000.0000 Grade 0.6700 Contained (oz) 15014.3986 Classification Resource Source trail 20-F: 20-F Mineral Resources (exclusive of Mineral Reserves) summary table / Hidden Valley Mineral Resource Estimate Published 2025-10-31 Verification Approved; not independently verified · Model extracted QA BLOCK: recomputed contained 15143.3231 oz vs reported 15014398.64754926690382086160 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 sweep: print-verified Copies a pre-filled issue record so you can send it through your normal channel.

Reserves

Category	Tonnes (Mt)	Au		Ag		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	As at	Source	Provenance
Proved	1.63 Mt	0.95 g/t	0.05 Moz	22.69 g/t	1.19 Moz	30 June 2025	Mineral Reserves summary table — Other metals / Silver / Hidden ValleyUnverified Evidence record Hidden Valley Proved · Ag · as at 2025-06-30 Reported figure Area Whole project Basis 100% Ore tonnes (t) 1630000.0000 Grade 22.6900 Contained (oz) 1188998.9096 Classification Reserve Source trail 20-F: 20-F Mineral Reserves summary table — Other metals / Silver / Hidden Valley Published 2025-10-31 Verification Approved; not independently verified · Model extracted QA BLOCK: recomputed contained 1189085.7166 oz vs reported 1188998909.600999975668314997 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 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.	notes (5) Source: 20-F: 20-F · published 31 Oct 2025 Ref: Mineral Reserves summary table — Other metals / Silver / Hidden Valley SK-1300 — Reporting code of record: SK-1300 @ US$ 2,237/oz — Metal price assumption used to derive this estimate. QA notes: QA BLOCK: recomputed contained 1189085.7166 oz vs reported 1188998909.600999975668314997 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 sweep fix: incl_of_res cleared — flag belongs on resource rows only; figures print-verified
Probable	17.00 Mt	1.45 g/t	0.79 Moz	24.52 g/t	13.40 Moz	30 June 2025	Mineral Reserves summary table / Hidden Valley Mineral Reserve EstimateUnverified Evidence record Hidden Valley Probable · Au · as at 2025-06-30 Reported figure Area Whole project Basis 100% Ore tonnes (t) 16997000.0000 Grade 1.4500 Contained (oz) 791004.8178 Classification Reserve Source trail 20-F: 20-F Mineral Reserves summary table / Hidden Valley Mineral Reserve Estimate Published 2025-10-31 Verification Approved; not independently verified · Model extracted QA BLOCK: recomputed contained 792376.0472 oz vs reported 791004817.8279542047852348134 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 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.	notes (5) Source:
Total Reserves	18.63 Mt	1.41 g/t	0.84 Moz	24.36 g/t	14.59 Moz	30 June 2025	derived from 2 rows Proved: Mineral Reserves summary table — Other metals / Silver / Hidden Valley Probable: Mineral Reserves summary table — Other metals / Silver / Hidden Valley Unverified Evidence record Hidden Valley Total Reserve · Ag · as at 2025-06-30 Reported figure Area Whole project Basis 100% Ore tonnes (t) 18627000 Grade 24.359861491383477 Contained (oz) 14586022.1003 Classification Reserve Source trail 20-F: 20-F Mineral Reserves summary table — Other metals / Silver / Hidden Valley · contributes Proved 20-F: 20-F Mineral Reserves summary table — Other metals / Silver / Hidden Valley · contributes Probable Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.