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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).

La Yaqui Grande

Sonora, Mexico · ProducingUnverified

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	—	—	—	—
Indicated	1.46 Mt	0.80 g/t	0.04 Moz	31 Dec 2025
Inferred	0.04 Mt	2.17 g/t	3 koz	31 Dec 2025
Total Resources	1.50 Mt	0.84 g/t	0.04 Moz	31 Dec 2025
Proved	0.13 Mt	0.90 g/t	4 koz	31 Dec 2025
Probable	3.17 Mt	1.37 g/t	0.14 Moz	31 Dec 2025
Total Reserves	3.29 Mt	1.35 g/t	0.14 Moz	31 Dec 2025

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	—	—	—	—
Indicated	1.46 Mt	9.93 g/t	0.47 Moz	31 Dec 2025
Inferred	0.04 Mt	3.69 g/t	0.01 Moz	31 Dec 2025
Total Resources	1.50 Mt	9.76 g/t	0.47 Moz	31 Dec 2025
Proved	—	—	—	—
Probable

Cut-off grade

0.3000 g/t Ag · 0.3000 g/t Au · 0.1000 g/t Au

Price assumption

US$2000.00/oz · US$1800.00/oz

JORC code year

—

Peer benchmark — producing Au projects (282 with resources)Resource size P5Resource grade P30View 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: Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 · 31 Dec 2025
Reporting code: unknown
Convention: exclusive
Currency assumption: US$
Disagreement flags: 4 rows

Current R&R

Resources

Category	Tonnes (Mt)	Au		Ag		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	As at	Source	Provenance
Indicated	1.46 Mt	0.80 g/t	0.04 Moz	9.93 g/t	0.47 Moz	31 Dec 2025	Table 3: MEASURED AND INDICATED SILVER MINERAL RESOURCESUnverified Evidence record La Yaqui Grande Indicated · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 1462000.0000 Grade 9.9300 Contained (oz) 467000.0000 Classification Resource Source trail Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 Table 3: MEASURED AND INDICATED SILVER MINERAL RESOURCES Published 2026-02-17 Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.

Reserves

Category	Tonnes (Mt)	Au		Ag		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	As at	Source	Provenance
Proved	0.13 Mt	0.90 g/t	4 koz	—	—	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record La Yaqui Grande Proved · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 127000.0000 Grade 0.9000 Contained (oz) 4000.0000 Classification Reserve Source trail Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025 Published 2026-02-17 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 8.13% 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. Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 · published 17 Feb 2026 Ref: Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025 Unknown code — Reporting code not yet captured for this row. Cutoff 0.10 g/t Au — Cut-off grade assumption from the source statement. @ US$ 1,800/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 INFO: recompute differs 8.13% 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.
Probable	3.17 Mt	1.37 g/t	0.14 Moz	14.77 g/t	1.50 Moz	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record La Yaqui Grande Probable · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 3166000.0000 Grade 1.3700 Contained (oz) 139000.0000 Classification Reserve Source trail Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025 Published 2026-02-17 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: Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 · published 17 Feb 2026
Total Reserves	3.17–3.29 Mt	1.35 g/t	0.14 Moz	14.77 g/t	1.50 Moz	31 Dec 2025	Table 1: PROVEN AND PROBABLE SILVER MINERAL RESERVESUnverified Evidence record La Yaqui Grande Total Reserve · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 3166000.0000 Grade 14.7700 Contained (oz) 1503000.0000 Classification Reserve Source trail Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 Table 1: PROVEN AND PROBABLE SILVER MINERAL RESERVES Published 2026-02-17 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: Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025