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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).

Uchucchacua

Peru · 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.

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	0.92 Mt	297.46 g/t	8.82 Moz	31 Dec 2023
Indicated	2.68 Mt	295.96 g/t	25.53 Moz	31 Dec 2023
Inferred	6.54 Mt	453.71 g/t	95.46 Moz	31 Dec 2023
Total Resources	10.15 Mt	397.80 g/t	129.81 Moz	31 Dec 2023
Proved	0.65 Mt	356.55 g/t	7.43 Moz	31 Dec 2023
Probable	4.67 Mt	457.86 g/t	68.81 Moz	31 Dec 2023
Total Reserves	5.32 Mt	445.53 g/t	76.24 Moz	31 Dec 2023

Zn

Category	Tonnes (Mt)	Grade (% Zn)	Contained (Mt Zn)	As at
Measured	0.92 Mt	2.31%	0.02 Mt Zn	31 Dec 2023
Indicated	2.68 Mt	2.30%	0.06 Mt Zn	31 Dec 2023
Inferred	6.54 Mt	2.28%	0.15 Mt Zn	31 Dec 2023
Total Resources	10.15 Mt	2.29%	0.23 Mt Zn	31 Dec 2023
Proved	0.65 Mt	2.31%	0.01 Mt Zn	31 Dec 2023
Probable

Pb

Category	Tonnes (Mt)	Grade (% Pb)	Contained (Mt Pb)	As at
Measured	0.92 Mt	1.22%	0.01 Mt Pb	31 Dec 2023
Indicated	2.68 Mt	1.25%	0.03 Mt Pb	31 Dec 2023
Inferred	6.54 Mt	1.41%	0.09 Mt Pb	31 Dec 2023
Total Resources	10.15 Mt	1.35%	0.14 Mt Pb	31 Dec 2023
Proved	0.65 Mt	1.51%	0.01 Mt Pb	31 Dec 2023
Probable

Cut-off grade

58.8000 % Zn · 58.8000 g/t Ag · 58.8000 % Pb

Price assumption

US$23.00/oz

JORC code year

—

Peer benchmark — producing Ag projects (118 with resources)Resource size P83Resource grade P96View 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/A: 20-F/A · 31 Dec 2023
Reporting code: SK-1300
Convention: exclusive
Currency assumption: US$

Current R&R

Resources

Category	Tonnes (Mt)	Ag		Zn		Pb		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Pb)	Contained (Mt Pb)	As at	Source	Provenance
Measured	0.92 Mt	297.46 g/t	8.82 Moz	2.31%	0.02 Mt Zn	1.22%	0.01 Mt Pb	31 Dec 2023

Reserves

Category	Tonnes (Mt)	Ag		Zn		Pb		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Pb)	Contained (Mt Pb)	As at	Source	Provenance
Proved	0.65 Mt	356.55 g/t	7.43 Moz	2.31%	0.01 Mt Zn	1.51%	0.01 Mt Pb	31 Dec 2023	Uchucchacua – Year End Mineral Reserves as of December 31, 2023 (on a 100% ownership basis)Unverified Evidence record Uchucchacua Proved · Zn · as at 2023-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 647791.0000 Grade 2.3100 Contained (t Zn) 14969.0000 Classification Reserve Source trail 20-F/A: 20-F/A Uchucchacua – Year End Mineral Reserves as of December 31, 2023 (on a 100% ownership basis) Published 2025-01-14 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: 20-F/A: 20-F/A · published 14 Jan 2025 Ref: Uchucchacua – Year End Mineral Reserves as of December 31, 2023 (on a 100% ownership basis) SK-1300 — Reporting code of record: SK-1300 Cutoff 58.80 % Zn — Cut-off grade assumption from the source statement. @ US$ 23/t — Metal price assumption used to derive this estimate. QA notes: QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none.
Probable	4.67 Mt	457.86 g/t	68.81 Moz	2.18%	0.10 Mt Zn	1.34%	0.06 Mt Pb	31 Dec 2023	Uchucchacua – Year End Mineral Reserves as of December 31, 2023 (on a 100% ownership basis)Unverified Evidence record Uchucchacua Probable · Pb · as at 2023-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 4674629.0000 Grade 1.3400 Contained (t Pb) 62491.0000 Classification Reserve Source trail 20-F/A: 20-F/A Uchucchacua – Year End Mineral Reserves as of December 31, 2023 (on a 100% ownership basis) Published 2025-01-14 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: 20-F/A: 20-F/A
Total Reserves	5.32 Mt	445.53 g/t	76.24 Moz	2.20%	0.12 Mt Zn	1.36%	0.07 Mt Pb	31 Dec 2023	Uchucchacua – Year End Mineral Reserves as of December 31, 2023 (on a 100% ownership basis)Unverified Evidence record Uchucchacua Total Reserve · Pb · as at 2023-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 5322420.0000 Grade 1.3600 Contained (t Pb) 72285.0000 Classification Reserve Source trail 20-F/A: 20-F/A Uchucchacua – Year End Mineral Reserves as of December 31, 2023 (on a 100% ownership basis) Published 2025-01-14 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: