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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).

El Porvenir

Peru · Producing · 83.5% 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.

Au

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	0.65 Mt	0.12 g/t	2.5 koz	31 Dec 2025
Indicated	2.89 Mt	0.15 g/t	0.01 Moz	31 Dec 2025
Inferred	20.49 Mt	0.30 g/t	0.20 Moz	31 Dec 2025
Total Resources	24.03 Mt	0.28 g/t	0.22 Moz	31 Dec 2025
Proved	4.32 Mt	0.16 g/t	0.02 Moz	31 Dec 2025
Probable	11.87 Mt	0.20 g/t	0.08 Moz	31 Dec 2025
Total Reserves	16.19 Mt	0.19 g/t	0.10 Moz	31 Dec 2025

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	0.65 Mt	43.90 g/t	0.91 Moz	31 Dec 2025
Indicated	2.89 Mt	51.80 g/t	4.82 Moz	31 Dec 2025
Inferred	20.49 Mt	83.80 g/t	55.23 Moz	31 Dec 2025
Total Resources	24.03 Mt	78.87 g/t	60.95 Moz	31 Dec 2025
Proved	4.32 Mt	69.30 g/t	9.62 Moz	31 Dec 2025
Probable

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	0.65 Mt	0.28%	1.8 kt Cu	31 Dec 2025
Indicated	2.89 Mt	0.24%	0.01 Mt Cu	31 Dec 2025
Inferred	20.49 Mt	0.22%	0.04 Mt Cu	31 Dec 2025
Total Resources	24.03 Mt	0.22%	0.05 Mt Cu	31 Dec 2025
Proved	4.32 Mt	0.27%	0.01 Mt Cu	31 Dec 2025
Probable

Zn

Category	Tonnes (Mt)	Grade (% Zn)	Contained (Mt Zn)	As at
Measured	0.65 Mt	3.17%	0.02 Mt Zn	31 Dec 2025
Indicated	2.89 Mt	3.21%	0.09 Mt Zn	31 Dec 2025
Inferred	20.49 Mt	3.69%	0.76 Mt Zn	31 Dec 2025
Total Resources	24.03 Mt	3.62%	0.87 Mt Zn	31 Dec 2025
Proved	4.32 Mt	4.35%	0.19 Mt Zn	31 Dec 2025
Probable

Pb

Category	Tonnes (Mt)	Grade (% Pb)	Contained (Mt Pb)	As at
Measured	0.65 Mt	0.63%	4.1 kt Pb	31 Dec 2025
Indicated	2.89 Mt	0.77%	0.02 Mt Pb	31 Dec 2025
Inferred	20.49 Mt	1.24%	0.25 Mt Pb	31 Dec 2025
Total Resources	24.03 Mt	1.17%	0.28 Mt Pb	31 Dec 2025
Proved	4.32 Mt	1.06%	0.05 Mt Pb	31 Dec 2025
Probable

Cut-off grade

72.9100 % Zn · 72.9100 g/t Au · 72.9100 % Pb · 72.9100 g/t Ag · 72.9100 % Cu

Price assumption

US$3449.20/t · US$2999.30/t

JORC code year

—

Peer benchmark — producing Zn projects (46 with resources)Resource size P62Resource grade P71View 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$
Disagreement flags: 6 rows

Current R&R

Resources

Category	Tonnes (Mt)	Au		Ag		Cu		Zn		Pb		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Pb)	Contained (Mt Pb)	As at	Source	Provenance
Measured	0.65 Mt	0.12 g/t	2.5 koz

Inferred

20.49 Mt

0.30 g/t

0.20 Moz

83.80 g/t

55.23 Moz

0.22%

0.04 Mt Cu

3.69%

0.76 Mt Zn

1.24%

0.25 Mt Pb

31 Dec 2025

El Porvenir – Year End Mineral Resources as of December 31, 2025 (on a 100% ownership basis)Unverified

notes (6)

Source: 20-F: 20-F · published 26 Mar 2026

Ref: El Porvenir – Year End Mineral Resources as of December 31, 2025 (on a 100% ownership basis)

SK-1300 — Reporting code of record: SK-1300
Cutoff 72.91 g/t Au — Cut-off grade assumption from the source statement.
@ US$ 3,449.2/oz — Metal price assumption used to derive this estimate.
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).

QA notes:

QA INFO: recompute differs 1.38% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±1.67% (rounding granularity) — treated as reconciled.
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.

Reserves

Category	Tonnes (Mt)	Au		Ag		Cu		Zn		Pb		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Pb)	Contained (Mt Pb)	As at	Source	Provenance
Proved	4.32 Mt	0.16 g/t	0.02 Moz	69.30 g/t	9.62 Moz	0.27%	0.01 Mt Cu	4.35%	0.19 Mt Zn	1.06%	0.05 Mt Pb	31 Dec 2025	El Porvenir – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record El Porvenir Proved · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 4320000.0000 Grade 0.2700 Contained (t Cu) 11800.0000 Classification Reserve Source trail 20-F: 20-F El Porvenir – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) Published 2026-03-26 Verification Approved; not independently verified · Model extracted QA INFO: recompute differs 1.15% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±1.85% (rounding granularity) — treated as reconciled. \| 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 (5) Source: 20-F: 20-F · published 26 Mar 2026 Ref: El Porvenir – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) SK-1300 — Reporting code of record: SK-1300 Cutoff 72.91 % Cu — Cut-off grade assumption from the source statement. @ US$ 2,999.3/t — Metal price assumption used to derive this estimate. QA notes: QA INFO: recompute differs 1.15% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±1.85% (rounding granularity) — treated as reconciled. 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.
Probable	11.87 Mt	0.20 g/t	0.08 Moz	64.80 g/t	24.73 Moz	0.26%	0.03 Mt Cu	4.16%	0.49 Mt Zn	0.96%	0.11 Mt Pb	31 Dec 2025	El Porvenir – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record El Porvenir Probable · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 11870000.0000 Grade 64.8000 Contained (oz) 24734000.0000 Classification Reserve Source trail 20-F: 20-F El Porvenir – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) Published 2026-03-26 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.
Total Reserves	16.19 Mt	0.19 g/t	0.10 Moz	66.00 g/t	34.36 Moz	0.26%	0.04 Mt Cu	4.21%	0.68 Mt Zn	0.99%	0.16 Mt Pb	31 Dec 2025	El Porvenir – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record El Porvenir Total Reserve · Zn · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 16190000.0000 Grade 4.2100 Contained (t Zn) 682000.0000 Classification Reserve Source trail 20-F: 20-F El Porvenir – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) Published 2026-03-26 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.