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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).

Los Gatos

Chihuahua, Mexico · Producing · 70.0% 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	2.57 Mt	0.36 g/t	0.03 Moz	31 Dec 2025
Indicated	9.53 Mt	0.24 g/t	0.07 Moz	31 Dec 2025
Inferred	5.80 Mt	0.19 g/t	0.03 Moz	31 Dec 2025
Total Resources	4.26 Mt	0.33 g/t	0.05 Moz	31 Dec 2025
Proved	2.81 Mt	0.25 g/t	0.02 Moz	31 Dec 2025
Probable	10.84 Mt	0.17 g/t	0.06 Moz	31 Dec 2025
Total Reserves	13.64 Mt	0.19 g/t	0.08 Moz	31 Dec 2025

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.

Dotted tonnes/grade are derived under the active Resources treatment: tonnes are netted of (or grossed by) the reserve tonnage alongside contained, and grade is re-derived as netted contained ÷ netted tonnes — not the published figures.

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	2.57 Mt	314.00 g/t	25.91 Moz	31 Dec 2025
Indicated	9.53 Mt	113.00 g/t	34.60 Moz	31 Dec 2025
Inferred	5.80 Mt	82.00 g/t	15.30 Moz	31 Dec 2025
Total Resources	4.26 Mt	185.68 g/t	25.41 Moz	31 Dec 2025
Proved

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	2.57 Mt	0.11%	2.77 kt Cu	31 Dec 2025
Indicated	9.53 Mt	0.27%	0.03 Mt Cu	31 Dec 2025
Inferred	5.80 Mt	0.21%	0.01 Mt Cu	31 Dec 2025
Total Resources	4.26 Mt	0.36%	0.02 Mt Cu	31 Dec 2025
Proved

Zn

Category	Tonnes (Mt)	Grade (% Zn)	Contained (Mt Zn)	As at
Measured	2.57 Mt	4.99%	0.13 Mt Zn	31 Dec 2025
Indicated	9.53 Mt	4.39%	0.42 Mt Zn	31 Dec 2025
Inferred	5.80 Mt	3.88%	0.23 Mt Zn	31 Dec 2025
Total Resources	4.26 Mt	7.67%	0.33 Mt Zn	31 Dec 2025
Proved

Pb

Category	Tonnes (Mt)	Grade (% Pb)	Contained (Mt Pb)	As at
Measured	2.57 Mt	2.64%	0.07 Mt Pb	31 Dec 2025
Indicated	9.53 Mt	2.35%	0.22 Mt Pb	31 Dec 2025
Inferred	5.80 Mt	1.78%	0.10 Mt Pb	31 Dec 2025
Total Resources	4.26 Mt	3.62%	0.15 Mt Pb	31 Dec 2025
Proved

Cut-off grade

61.0900 g/t Au · 61.0900 % Pb · 61.0900 % Zn · 61.0900 g/t Ag · 61.0900 % Cu

Price assumption

US$38.50/oz · US$35.00/oz

JORC code year

—

Peer benchmark — producing Ag projects (118 with resources)Resource size P46Resource grade P81View 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: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) · 31 Dec 2025
Reporting code: SK-1300
Convention: inclusive
Currency assumption: US$
Disagreement flags: 63 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	Measured

Total

Indicated

9.53 Mt

0.24 g/t

0.07 Moz

113.00 g/t

34.60 Moz

0.27%

0.03 Mt Cu

4.39%

0.42 Mt Zn

2.35%

0.22 Mt Pb

31 Dec 2025

Table 20: Los Gatos Mineral Resource Estimates – Total Indicated (UG)Unverified

notes (6)

Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) · published 31 Mar 2026

Ref: Table 20: Los Gatos Mineral Resource Estimates – Total Indicated (UG)

SK-1300 — Reporting code of record: SK-1300
Cutoff 61.09 g/t Au — Cut-off grade assumption from the source statement.
@ US$ 38.5/oz — Metal price assumption used to derive this estimate.
inc — Stated Resources are inclusive of Reserves. Set Resources: Excl. Reserves to net them out.
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin. QA INFO: recompute differs 2.93% from the printed contained figure, but the printed tonnes/grade/contained carry ±8.16% rounding granularity (capped per component; the true half-step band of coarse prints is wider) and the remainder sits under the warn threshold — treated as reconciled.

Total

Inferred

5.80 Mt

0.19 g/t

0.03 Moz

82.00 g/t

15.30 Moz

0.21%

0.01 Mt Cu

3.88%

0.23 Mt Zn

1.78%

0.10 Mt Pb

31 Dec 2025

Table 21: Los Gatos Mineral Resource Estimates, Inferred Category – Total Inferred (UG)Unverified

notes (6)

Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) · published 31 Mar 2026

Ref: Table 21: Los Gatos Mineral Resource Estimates, Inferred Category – Total Inferred (UG)

SK-1300 — Reporting code of record: SK-1300
Cutoff 61.09 g/t Au — Cut-off grade assumption from the source statement.
@ US$ 38.5/oz — Metal price assumption used to derive this estimate.
inc — Stated Resources are inclusive of Reserves. Set Resources: Excl. Reserves to net them out.
attrib — Figures are net to the issuer's ownership interest as reported (attributable basis) — NOT 100% of the project.

QA notes:

QA WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin. QA INFO: recompute differs 24.01% from the printed contained figure, but the print is exactly consistent with the recompute at the printed tonnes/grade/contained granularity (rounding-interval overlap) — treated as reconciled.

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	Proved	2.81 Mt	0.25 g/t	0.02 Moz	231.00 g/t	20.81 Moz	0.07%	2.09 kt Cu	3.51%	0.10 Mt Zn	1.85%	0.05 Mt Pb	31 Dec 2025	Table 22: Los Gatos Mineral Reserve Estimates – Total Proven (UG)Unverified Evidence record Los Gatos Proved · Ag · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 2814285.7142857146 Grade 231.0000 Contained (oz) 20814285.714285716 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 22: Los Gatos Mineral Reserve Estimates – Total Proven (UG) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin. Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) · published 31 Mar 2026 Ref: Table 22: Los Gatos Mineral Reserve Estimates – Total Proven (UG) SK-1300 — Reporting code of record: SK-1300 @ US$ 35/oz — 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 WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin.
Total	Probable	10.84 Mt	0.17 g/t	0.06 Moz	85.00 g/t	29.57 Moz	0.21%	0.02 Mt Cu	3.19%	0.35 Mt Zn	1.74%	0.19 Mt Pb	31 Dec 2025	Table 22: Los Gatos Mineral Reserve Estimates – Total Probable (UG)Unverified Evidence record Los Gatos Probable · Au · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 10842857.142857144 Grade 0.1700 Contained (oz) 60000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 22: Los Gatos Mineral Reserve Estimates – Total Probable (UG) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin. QA INFO: recompute differs 1.23% from the printed contained figure, but the printed tonnes/grade/contained carry ±4.20% rounding granularity (capped per component; the true half-step band of coarse prints is wider) and the remainder sits under the warn threshold — treated as reconciled. Copies a pre-filled issue record so you can send it through your normal channel.
Total	Total Reserves	13.64 Mt	0.19 g/t	0.08 Moz	115.00 g/t	50.40 Moz	0.19%	0.03 Mt Cu	3.26%	0.44 Mt Zn	1.76%	0.24 Mt Pb	31 Dec 2025	Table 22: Los Gatos Mineral Reserve Estimates – Total Proven + Probable (UG)Unverified Evidence record Los Gatos Total Reserve · Pb · as at 2025-12-31 Reported figure Area Whole project Basis attributable Ore tonnes (t) 13642857.142857144 Grade 1.7600 Contained (t Pb) 240669.6315714286 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 22: Los Gatos Mineral Reserve Estimates – Total Proven + Probable (UG) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin. Copies a pre-filled issue record so you can send it through your normal channel.
CLG (UG)	Proved	2.81 Mt	0.25 g/t	0.02 Moz	231.00 g/t	20.81 Moz	0.07%	2.09 kt Cu	3.51%	0.10 Mt Zn	1.85%	0.05 Mt Pb	31 Dec 2025	Table 22: Los Gatos Mineral Reserve EstimatesUnverified Evidence record Los Gatos Proved · Zn · as at 2025-12-31 Reported figure Area CLG (UG) Basis attributable Ore tonnes (t) 2814285.7142857146 Grade 3.5100 Contained (t Zn) 98513.78285714285 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 22: Los Gatos Mineral Reserve Estimates Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin. QA INFO: identical figures to area(s) 'UG' — likely the same printed line under two labels (a summary and a detail table); keep one label and reject the other. Copies a pre-filled issue record so you can send it through your normal channel.
CLG (UG)	Probable	10.84 Mt	0.17 g/t	0.06 Moz	85.00 g/t	29.57 Moz	0.21%	0.02 Mt Cu	3.19%	0.35 Mt Zn	1.74%	0.19 Mt Pb	31 Dec 2025	Table 22: Los Gatos Mineral Reserve EstimatesUnverified Evidence record Los Gatos Probable · Au · as at 2025-12-31 Reported figure Area CLG (UG) Basis attributable Ore tonnes (t) 10842857.142857144 Grade 0.1700 Contained (oz) 60000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 22: Los Gatos Mineral Reserve Estimates Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA WARN: identical figures appear under ANOTHER area label of this project in the same document — likely one printed estimate stored twice (a summary/grouping line duplicating its leaf). Keep one copy; reject the relabelled twin. QA INFO: recompute differs 1.23% from the printed contained figure, but the printed tonnes/grade/contained carry ±4.20% rounding granularity (capped per component; the true half-step band of coarse prints is wider) and the remainder sits under the warn threshold — treated as reconciled. Copies a pre-filled issue record so you can send it through your normal channel.