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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).

Atacocha

Peru · Developing · 83.0% 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	2.00 Mt	0.16 g/t	0.01 Moz	31 Dec 2025
Indicated	4.30 Mt	0.20 g/t	0.03 Moz	31 Dec 2025
Inferred	1.49 Mt	0.18 g/t	0.01 Moz	31 Dec 2025
Total Resources	7.79 Mt	0.19 g/t	0.05 Moz	31 Dec 2025
Proved	1.33 Mt	0.17 g/t	0.01 Moz	31 Dec 2025
Probable	1.62 Mt	0.22 g/t	0.01 Moz	31 Dec 2025
Total Reserves	2.95 Mt	0.20 g/t	0.02 Moz	31 Dec 2025

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	2.90 Mt	34.85 g/t	3.26 Moz	31 Dec 2025
Indicated	6.49 Mt	35.83 g/t	7.47 Moz	31 Dec 2025
Inferred	10.04 Mt	71.67 g/t	23.12 Moz	31 Dec 2025
Total Resources	19.43 Mt	54.20 g/t	33.85 Moz	31 Dec 2025
Proved	3.31 Mt	63.60 g/t	6.78 Moz	31 Dec 2025
Probable

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	0.90 Mt	0.27%	2.4 kt Cu	31 Dec 2025
Indicated	2.19 Mt	0.33%	0.01 Mt Cu	31 Dec 2025
Inferred	8.55 Mt	0.58%	0.05 Mt Cu	31 Dec 2025
Total Resources	11.64 Mt	0.51%	0.06 Mt Cu	31 Dec 2025
Proved	1.98 Mt	0.33%	0.01 Mt Cu	31 Dec 2025
Probable

Zn

Category	Tonnes (Mt)	Grade (% Zn)	Contained (Mt Zn)	As at
Measured	2.90 Mt	1.69%	0.05 Mt Zn	31 Dec 2025
Indicated	6.49 Mt	1.73%	0.11 Mt Zn	31 Dec 2025
Inferred	10.04 Mt	3.67%	0.37 Mt Zn	31 Dec 2025
Total Resources	19.43 Mt	2.73%	0.53 Mt Zn	31 Dec 2025
Proved	3.31 Mt	2.68%	0.09 Mt Zn	31 Dec 2025
Probable

Pb

Category	Tonnes (Mt)	Grade (% Pb)	Contained (Mt Pb)	As at
Measured	2.90 Mt	0.78%	0.02 Mt Pb	31 Dec 2025
Indicated	6.49 Mt	0.88%	0.06 Mt Pb	31 Dec 2025
Inferred	10.04 Mt	1.16%	0.12 Mt Pb	31 Dec 2025
Total Resources	19.43 Mt	1.01%	0.20 Mt Pb	31 Dec 2025
Proved	3.31 Mt	1.35%	0.04 Mt Pb	31 Dec 2025
Probable

Cut-off grade

77.6000 % Cu · 22.9100 g/t Au · 22.9100 % Pb · 22.9100 g/t Ag · 22.9100 % Zn · 77.6000 % Pb · 77.6000 g/t Ag · 77.6000 % Zn

Price assumption

US$3449.20/t · US$2999.30/t

JORC code year

—

Peer benchmark — developing Zn projects (33 with resources)Resource size P89Resource 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 · 31 Dec 2025
Reporting code: SK-1300
Convention: exclusive
Currency assumption: US$
Disagreement flags: 4 rows

Current R&R

Resources

Area	Category	Tonnes (Mt)	Au		Ag		Cu		Zn		Pb		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 (% Zn)	Contained (Mt Zn)	Grade (% Pb)	Contained (Mt Pb)	As at	Source	Provenance
Total

Open Pit

Measured

2.00 Mt

0.16 g/t

0.01 Moz

28.80 g/t

1.86 Moz

—

1.11%

0.02 Mt Zn

0.78%

0.02 Mt Pb

31 Dec 2025

Atacocha Open Pit – 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: Atacocha Open Pit – Year End Mineral Resources as of December 31, 2025 (on a 100% ownership basis)

SK-1300 — Reporting code of record: SK-1300
Cutoff 22.91 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 2.94% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±3.13% (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.

Open Pit

Indicated

4.30 Mt

0.20 g/t

0.03 Moz

27.80 g/t

3.84 Moz

—

0.96%

0.04 Mt Zn

0.87%

0.04 Mt Pb

31 Dec 2025

Atacocha Open Pit – 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: Atacocha Open Pit – Year End Mineral Resources as of December 31, 2025 (on a 100% ownership basis)

SK-1300 — Reporting code of record: SK-1300
Cutoff 22.91 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 2.03% from the printed contained figure, but the printed tonnes/grade/contained are only good to ±2.50% (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.

Underground

Measured

0.90 Mt

—

48.30 g/t

1.40 Moz

0.27%

2.4 kt Cu

2.99%

0.03 Mt Zn

0.78%

0.01 Mt Pb

31 Dec 2025

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

SK-1300 — Reporting code of record: SK-1300
Cutoff 77.60 % Cu — Cut-off grade assumption from the source statement.
@ US$ 3,449.2/t — 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 1.25% 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.

Reserves

Area	Category	Tonnes (Mt)	Au		Ag		Cu		Zn		Pb		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 (% Zn)	Contained (Mt Zn)	Grade (% Pb)	Contained (Mt Pb)	As at	Source	Provenance
Total	Total Reserves	2.95–9.61 Mt	0.20 g/t	0.02 Moz	64.29 g/t	19.87 Moz	0.41%	0.03 Mt Cu	—	—	1.27%	0.12 Mt Pb	31 Dec 2025	derived from 4 rows Proved: Atacocha Open Pit – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) Proved: Atacocha Underground – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) Probable: Atacocha Underground – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) Probable: Atacocha Open Pit – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) Unverified Evidence record Atacocha Total Reserve · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 9610000 Grade 64.28574401664932 Contained (oz) 19870000 Classification Reserve Source trail 20-F: 20-F Atacocha Open Pit – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) · contributes Proved 20-F: 20-F Atacocha Underground – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) · contributes Proved 20-F: 20-F Atacocha Underground – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) · contributes Probable 20-F: 20-F Atacocha Open Pit – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis) · contributes Probable Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.	—
Open Pit	Proved	1.33 Mt	0.17 g/t	0.01 Moz	37.40 g/t	1.60 Moz	—	—	1.17%	0.02 Mt Zn	1.21%	0.02 Mt Pb	31 Dec 2025	Atacocha Open Pit – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record Atacocha Proved · Ag · as at 2025-12-31 Reported figure Area Open Pit Basis 100% Ore tonnes (t) 1330000.0000 Grade 37.4000 Contained (oz) 1602000.0000 Classification Reserve Source trail 20-F: 20-F Atacocha Open Pit – 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.
Open Pit	Probable	1.62 Mt	0.22 g/t	0.01 Moz	33.00 g/t	1.72 Moz	—	—	1.19%	0.02 Mt Zn	1.21%	0.02 Mt Pb	31 Dec 2025	Atacocha Open Pit – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record Atacocha Probable · Zn · as at 2025-12-31 Reported figure Area Open Pit Basis 100% Ore tonnes (t) 1620000.0000 Grade 1.1900 Contained (t Zn) 19400.0000 Classification Reserve Source trail 20-F: 20-F Atacocha Open Pit – 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.
Open Pit	Total Reserves	2.95 Mt	—	—	—	—	—	—	1.18%	0.03 Mt Zn	—	—	31 Dec 2025	Atacocha Open Pit – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record Atacocha Total Reserve · Zn · as at 2025-12-31 Reported figure Area Open Pit Basis 100% Ore tonnes (t) 2950000.0000 Grade 1.1800 Contained (t Zn) 34900.0000 Classification Reserve Source trail 20-F: 20-F Atacocha Open Pit – 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.
Underground	Proved	1.98 Mt	—	—	81.20 g/t	5.18 Moz	0.33%	0.01 Mt Cu	3.70%	0.07 Mt Zn	1.44%	0.03 Mt Pb	31 Dec 2025	Atacocha Underground – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record Atacocha Proved · Zn · as at 2025-12-31 Reported figure Area Underground Basis 100% Ore tonnes (t) 1980000.0000 Grade 3.7000 Contained (t Zn) 73400.0000 Classification Reserve Source trail 20-F: 20-F Atacocha Underground – 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.
Underground	Probable	4.68 Mt	—	—	75.60 g/t	11.37 Moz	0.45%	0.02 Mt Cu	4.24%	0.20 Mt Zn	1.24%	0.06 Mt Pb	31 Dec 2025	Atacocha Underground – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record Atacocha Probable · Pb · as at 2025-12-31 Reported figure Area Underground Basis 100% Ore tonnes (t) 4680000.0000 Grade 1.2400 Contained (t Pb) 58000.0000 Classification Reserve Source trail 20-F: 20-F Atacocha Underground – 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.
Underground	Total Reserves	6.66 Mt	—	—	—	—	—	—	4.08%	0.27 Mt Zn	—	—	31 Dec 2025	Atacocha Underground – Year End Mineral Reserves as of December 31, 2025 (on a 100% ownership basis)Unverified Evidence record Atacocha Total Reserve · Zn · as at 2025-12-31 Reported figure Area Underground Basis 100% Ore tonnes (t) 6660000.0000 Grade 4.0800 Contained (t Zn) 271800.0000 Classification Reserve Source trail 20-F: 20-F Atacocha Underground – 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.