View settings100% · M+I+I · Resources excl. reserves · Native commodities

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).

Antamina

Peru · Producing · 33.8% 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.

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	97.78 Mt	9.00 g/t	28.29 Moz	30 June 2026
Indicated	240.00 Mt	11.00 g/t	84.88 Moz	30 June 2026
M&I = Measured + Indicated (overlaps both)	337.78 Mt	10.00 g/t	108.60 Moz	30 June 2026
Inferred	1,256.30 Mt	10.00 g/t	403.91 Moz	30 June 2026
Total Resources	1,594.07 Mt	10.09 g/t	517.08 Moz	30 June 2026
Proved	245.93 Mt	10.00 g/t	79.07 Moz	30 June 2026
Probable	257.78 Mt	13.00 g/t	107.74 Moz	30 June 2026
Total Reserves	503.70 Mt	11.00 g/t	178.14 Moz	30 June 2026

M&I is the issuer's printed Measured + Indicated subtotal — it overlaps the Measured and Indicated rows and is never added alongside them; the Total rows and every rollup already exclude it.

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.

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	97.78 Mt	0.66%	0.65 Mt Cu	30 June 2026
Indicated	240.00 Mt	0.83%	1.99 Mt Cu	30 June 2026
M&I = Measured + Indicated (overlaps both)	337.78 Mt	0.78%	2.63 Mt Cu	30 June 2026
Inferred	1,256.30 Mt	0.97%	12.19 Mt Cu	30 June 2026
Total Resources

Zn

Category	Tonnes (Mt)	Grade (% Zn)	Contained (Mt Zn)	As at
Measured	97.78 Mt	0.27%	0.26 Mt Zn	30 June 2026
Indicated	240.00 Mt	0.54%	1.30 Mt Zn	30 June 2026
M&I = Measured + Indicated (overlaps both)	337.78 Mt	0.46%	1.55 Mt Zn	30 June 2026
Inferred	1,256.30 Mt	0.44%	5.53 Mt Zn	30 June 2026
Total Resources

Mo

Category	Tonnes (Mt)	Grade (% Mo)	Contained (Mt Mo)	As at
Measured	97.78 Mt	0.01%	0.01 Mt Mo	30 June 2026
Indicated	240.00 Mt	0.02%	0.04 Mt Mo	30 June 2026
M&I = Measured + Indicated (overlaps both)	337.78 Mt	0.02%	0.06 Mt Mo	30 June 2026
Inferred	1,256.30 Mt	0.02%	0.23 Mt Mo	30 June 2026
Total Resources

Cut-off grade

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Price assumption

A$3.75/t · A$1.33/t · A$31.38/t · A$21.00/t · A$1.21/t · A$27.00/t · A$15.00/t

JORC code year

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Peer benchmark — producing Cu projects (98 with resources)Resource size P88Resource grade P77View 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 2026
Reporting code: SK-1300
Convention: exclusive
Currency assumption: A$

Current R&R

Resources

Category	Tonnes (Mt)	Ag		Cu		Zn		Mo		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Measured	97.78 Mt	9.00 g/t	28.29 Moz	0.66%	0.65 Mt Cu	0.27%

Reserves

Category	Tonnes (Mt)	Ag		Cu		Zn		Mo		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Proved	245.93 Mt	10.00 g/t	79.07 Moz	0.82%	2.02 Mt Cu	0.43%	1.06 Mt Zn	0.02%	0.06 Mt Mo	30 June 2026	6.1 Copper Mineral reserves As at 30 June 2026Unverified Evidence record Antamina Proved · Cu · as at 2026-06-30 Reported figure Area Whole project Basis attributable Ore tonnes (t) 245925925.9259259 Grade 0.8200 Contained (t Cu) 2016592.5925925926 Classification Reserve Source trail 20-F: 20-F 6.1 Copper Mineral reserves As at 30 June 2026 Published 2026-08-18 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. \| QA approve (t119v): source-table reconciled; printed values, basis and vintage verified \| t119v Copies a pre-filled issue record so you can send it through your normal channel.	notes (6) Source: 20-F: 20-F · published 18 Aug 2026 Ref: 6.1 Copper Mineral reserves As at 30 June 2026 SK-1300 — Reporting code of record: SK-1300 @ A$ 3.75/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: QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA approve (t119v): source-table reconciled; printed values, basis and vintage verified t119v
Probable	257.78 Mt	13.00 g/t	107.74 Moz	0.97%	2.50 Mt Cu	0.75%	1.93 Mt Zn	0.02%	0.06 Mt Mo	30 June 2026	6.1 Copper Mineral reserves As at 30 June 2026Unverified Evidence record Antamina Probable · Cu · as at 2026-06-30 Reported figure Area Whole project Basis attributable Ore tonnes (t) 257777777.77777776 Grade 0.9700 Contained (t Cu) 2500444.4444444445 Classification Reserve Source trail 20-F: 20-F 6.1 Copper Mineral reserves As at 30 June 2026 Published 2026-08-18 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. \| QA approve (t119v): source-table reconciled; printed values, basis and vintage verified \| t119v Copies a pre-filled issue record so you can send it through your normal channel.	notes (6)
Total Reserves	503.70 Mt	11.00 g/t	178.14 Moz	0.90%	4.53 Mt Cu	0.59%	2.97 Mt Zn	0.02%	0.12 Mt Mo	30 June 2026	6.1 Copper Mineral reserves As at 30 June 2026Unverified Evidence record Antamina Total Reserve · Cu · as at 2026-06-30 Reported figure Area Whole project Basis attributable Ore tonnes (t) 503703703.7037037 Grade 0.9000 Contained (t Cu) 4533333.333333333 Classification Reserve Source trail 20-F: 20-F 6.1 Copper Mineral reserves As at 30 June 2026 Published 2026-08-18 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. \| QA approve (t119v): source-table reconciled; printed values, basis and vintage verified \| t119v Copies a pre-filled issue record so you can send it through your normal channel.	notes (6)