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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).

San Martin

Jalisco, Mexico · Exploring · 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.

Au

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	0.07 Mt	0.40 g/t	0.9 koz	31 Dec 2020
Indicated	0.96 Mt	0.53 g/t	0.02 Moz	31 Dec 2020
Inferred	2.53 Mt	0.36 g/t	0.03 Moz	31 Dec 2020
Total Resources	3.56 Mt	0.41 g/t	0.05 Moz	31 Dec 2020
Proved	—	—	—	—
Probable	—	—	—	—
Total Reserves	—	—	—	—

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	0.07 Mt	221.00 g/t	0.50 Moz	31 Dec 2020
Indicated	0.96 Mt	277.00 g/t	8.52 Moz	31 Dec 2020
Inferred	2.53 Mt	226.00 g/t	18.40 Moz	31 Dec 2020
Total Resources	3.56 Mt	239.65 g/t	27.42 Moz	31 Dec 2020
Proved	—	—	—	—
Probable

Cut-off grade

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Price assumption

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JORC code year

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Peer benchmark — exploring Ag projects (133 with resources)Resource size P72Resource grade P94View 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 2020
Reporting code: SK-1300
Convention: unknown
Currency assumption: US$
Disagreement flags: 18 rows

Current R&R

Resources

Area	Category	Tonnes (Mt)	Au		Ag		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	As at	Source	Provenance
Total	Measured	0.07 Mt	0.40 g/t	0.9 koz	221.00 g/t	0.50 Moz	31 Dec 2020	Table 35: Internal Mineral Resource Estimates for the San Martin Silver Mine — Total Measured (UG)

Total

Indicated

0.96 Mt

0.53 g/t

0.02 Moz

277.00 g/t

8.52 Moz

31 Dec 2020

Table 35: Internal Mineral Resource Estimates for the San Martin Silver Mine — Total Indicated (UG)Unverified

notes (3)

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

Ref: Table 35: Internal Mineral Resource Estimates for the San Martin Silver Mine — Total Indicated (UG)

SK-1300 — Reporting code of record: SK-1300

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 WARN: mining_area 'Total (UG)' looks like a table SUBTOTAL line, not a leaf area — approving it alongside the leaf areas double-counts. Reject it (or reject the leaves) before approval. QA INFO: recompute differs 18.21% 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. 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.
QA fix: figures print-exact - T35 L1617 "Total Indicated (UG)": 0.96 Mt @ 277 Ag / 0.53 Au, Au 0.02 Moz, as-at 2020-12-31 per the table's effective date (L1602) and L432. This is the printed whole-project Total for a single underground mine, so the stripped-'Total' SUBTOTAL-label guard's suggested remedy ('reject it, or reject the leaves') is the wrong act

Total

Inferred

2.53 Mt

0.36 g/t

0.03 Moz

226.00 g/t

18.40 Moz

31 Dec 2020

Table 35: Internal Mineral Resource Estimates for the San Martin Silver Mine — Inferred Total (UG)Unverified

notes (3)

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

Ref: Table 35: Internal Mineral Resource Estimates for the San Martin Silver Mine — Inferred Total (UG)

SK-1300 — Reporting code of record: SK-1300

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 WARN: tonnes/contained equal the SUM of 2 sibling row(s) of the same classification/category/commodity (UG, La Veladora (UG)) — likely a printed multi-deposit rollup/subtotal. Policy keeps leaf rows and printed whole-project Totals only; reject mid-level rollups (double-count). QA WARN: mining_area 'Total (UG)' looks like a table SUBTOTAL line, not a leaf area — approving it alongside the leaf areas double-counts. Reject it (or reject the leaves) before approval. QA INFO: recompute differs 2.39% from the printed contained figure, but the printed tonnes/grade/contained carry ±7.59% 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. 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.
QA fix: figures print-exact - T35 L1638 "Inferred Total (UG)": 2.53 Mt @ 226 Ag / 0.36 Au, Au 0.03 Moz, as-at 2020-12-31 per the table's effective date (L1602) and L432. This is the printed whole-project Total for a single underground mine, so the stripped-'Total' SUBTOTAL-label guard's suggested remedy ('reject it, or reject the leaves') is the wrong acti