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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 Dimas

Durango, Mexico · 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.

Au

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	1.90 Mt	4.49 g/t	0.27 Moz	31 Dec 2025
Indicated	2.97 Mt	2.98 g/t	0.28 Moz	31 Dec 2025
Inferred	5.82 Mt	2.64 g/t	0.49 Moz	31 Dec 2025
Total Resources	6.99 Mt	3.34 g/t	0.75 Moz	31 Dec 2025
Proved	1.45 Mt	2.64 g/t	0.12 Moz	31 Dec 2025
Probable	2.25 Mt	2.30 g/t	0.17 Moz	31 Dec 2025
Total Reserves	3.70 Mt	2.43 g/t	0.29 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	1.90 Mt	349.00 g/t	21.32 Moz	31 Dec 2025
Indicated	2.97 Mt	252.00 g/t	24.10 Moz	31 Dec 2025
Inferred	5.82 Mt	234.00 g/t	43.76 Moz	31 Dec 2025
Total Resources	6.99 Mt	293.77 g/t	66.02 Moz	31 Dec 2025
Proved

Cut-off grade

149.0000 g/t Ag · 149.0000 g/t Au

Price assumption

US$38.50/oz · US$35.00/oz

JORC code year

—

Peer benchmark — producing Ag projects (118 with resources)Resource size P72Resource grade P92View 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: 24 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	1.90 Mt	4.49 g/t	0.27 Moz	349.00 g/t	21.32 Moz	31 Dec 2025	TABLE 2 / Table 7: San Dimas Measured and Indicated Mineral Resource Estimate (Effective Date: December 31, 2025)

Reserves

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	Proved	1.45 Mt	2.64 g/t	0.12 Moz	217.00 g/t	10.13 Moz	31 Dec 2025	TABLE 1 / Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Proved · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 1450000.0000 Grade 217.0000 Contained (oz) 10130000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) TABLE 1 / Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA WARN: tonnes/contained equal the SUM of 3 sibling row(s) of the same classification/category/commodity (Western Block, Central Block (UG), Sinaloa Block (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 fix: figures print-exact - T10 L627 "Total Proven (UG)": 1.45 Mt @ 217 Ag / 2.64 Au, Ag 10.13 Moz. This is the printed whole-project total (San Dimas is one underground operation reported across five mining blocks), so the sibling-sum warn is expected and not a defect; only the label is wrong - 'UG' is the mining-method/scope suffix, not an area, and th 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 1 / Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) SK-1300 — Reporting code of record: SK-1300 @ US$ 35/oz — 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. QA WARN: tonnes/contained equal the SUM of 3 sibling row(s) of the same classification/category/commodity (Western Block, Central Block (UG), Sinaloa Block (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 fix: figures print-exact - T10 L627 "Total Proven (UG)": 1.45 Mt @ 217 Ag / 2.64 Au, Ag 10.13 Moz. This is the printed whole-project total (San Dimas is one underground operation reported across five mining blocks), so the sibling-sum warn is expected and not a defect; only the label is wrong - 'UG' is the mining-method/scope suffix, not an area, and th
Total	Probable	2.25 Mt	2.30 g/t	0.17 Moz	180.00 g/t	13.03 Moz	31 Dec 2025	TABLE 1 / Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Probable · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 2250000.0000 Grade 180.0000 Contained (oz) 13030000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) TABLE 1 / Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. \| QA fix: figures print-exact - T10 L634 "Total Probable (UG)": 2.25 Mt @ 180 Ag / 2.30 Au, Ag 13.03 Moz. This is the printed whole-project total (San Dimas is one underground operation reported across five mining blocks), so the sibling-sum warn is expected and not a defect; only the label is wrong - 'UG' is the mining-method/scope suffix, not an area, and Copies a pre-filled issue record so you can send it through your normal channel.	notes (4)
Total	Total Reserves	3.70 Mt	2.43 g/t	0.29 Moz	195.00 g/t	23.16 Moz	31 Dec 2025	TABLE 1 / Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Total Reserve · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 3700000.0000 Grade 2.4300 Contained (oz) 290000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) TABLE 1 / Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA WARN: cross-category subtotal — this total_reserve row on area 'UG' equals the sum of the same area's proved+probable leaves — a per-deposit M&I/P&P-style total (t24 LUN/LUG NI 43-101 class). Policy keeps category leaves + the whole-project Total; adjudicate per the per-property-totals precedent before approval. \| QA fix: figures print-exact - T10 L641 "Total Proven + Probable (UG)": 3.70 Mt @ 195 Ag / 2.43 Au, Au 0.289 Moz. This is the printed whole-project total (San Dimas is one underground operation reported across five mining blocks), so the sibling-sum warn is expected and not a defect; only the label is wrong - 'UG' is the mining-method/scope suffix, not an a Copies a pre-filled issue record so you can send it through your normal channel.
Central Block (UG)	Proved	0.94 Mt	2.77 g/t	0.08 Moz	209.00 g/t	6.28 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Proved · Au · as at 2025-12-31 Reported figure Area Central Block (UG) Basis 100% Ore tonnes (t) 940000.0000 Grade 2.7700 Contained (oz) 83000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 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 (3) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit)
Central Block (UG)	Probable	0.92 Mt	2.24 g/t	0.07 Moz	186.00 g/t	5.48 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Probable · Au · as at 2025-12-31 Reported figure Area Central Block (UG) Basis 100% Ore tonnes (t) 920000.0000 Grade 2.2400 Contained (oz) 66000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 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 (3) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit)
Other Areas (UG)	Proved	0.01 Mt	2.82 g/t	1 koz	108.00 g/t	0.05 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Proved · Au · as at 2025-12-31 Reported figure Area Other Areas (UG) Basis 100% Ore tonnes (t) 10000.0000 Grade 2.8200 Contained (oz) 1000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA INFO: recompute differs 9.33% from the printed contained figure, but the printed tonnes/grade/contained carry ±12.18% 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.	notes (3)
Other Areas (UG)	Probable	0.42 Mt	1.99 g/t	0.03 Moz	154.00 g/t	2.10 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Probable · Ag · as at 2025-12-31 Reported figure Area Other Areas (UG) Basis 100% Ore tonnes (t) 420000.0000 Grade 154.0000 Contained (oz) 2100000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 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 (3) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit)
Sinaloa Block (UG)	Proved	0.27 Mt	2.44 g/t	0.02 Moz	195.00 g/t	1.70 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Proved · Ag · as at 2025-12-31 Reported figure Area Sinaloa Block (UG) Basis 100% Ore tonnes (t) 270000.0000 Grade 195.0000 Contained (oz) 1700000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 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 (3) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit)
Sinaloa Block (UG)	Probable	0.43 Mt	2.80 g/t	0.04 Moz	185.00 g/t	2.56 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Probable · Au · as at 2025-12-31 Reported figure Area Sinaloa Block (UG) Basis 100% Ore tonnes (t) 430000.0000 Grade 2.8000 Contained (oz) 39000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 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 (3) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit)
Tayoltita Block (UG)	Probable	0.17 Mt	2.54 g/t	0.01 Moz	191.00 g/t	1.05 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Probable · Au · as at 2025-12-31 Reported figure Area Tayoltita Block (UG) Basis 100% Ore tonnes (t) 170000.0000 Grade 2.5400 Contained (oz) 14000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 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 (3) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit)
Western Block	Proved	0.23 Mt	2.33 g/t	0.02 Moz	282.00 g/t	2.10 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Proved · Au · as at 2025-12-31 Reported figure Area Western Block Basis 100% Ore tonnes (t) 230000.0000 Grade 2.3300 Contained (oz) 17000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 Verification Approved; not independently verified · Model extracted QA INFO: inclusive-of-reserves flag cleared — the flag describes resource statements; reserve rows carry none. QA INFO: recompute differs 1.35% from the printed contained figure, but the printed tonnes/grade/contained carry ±5.33% 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.	notes (3)
Western Block (UG)	Probable	0.31 Mt	2.05 g/t	0.02 Moz	186.00 g/t	1.84 Moz	31 Dec 2025	Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025)Unverified Evidence record San Dimas Probable · Ag · as at 2025-12-31 Reported figure Area Western Block (UG) Basis 100% Ore tonnes (t) 310000.0000 Grade 186.0000 Contained (oz) 1840000.0000 Classification Reserve Source trail 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit) Table 10: San Dimas Mineral Reserves Estimates (Effective Date: December 31, 2025) Published 2026-03-31 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 (3) Source: 40-F: FORM 40-F — exhibit99-1.htm (AIF exhibit)