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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).

Puerto Del Aire

Sonora, Mexico · DevelopingUnverified

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	0.36 Mt	3.32 g/t	0.04 Moz	31 Dec 2025
Indicated	2.04 Mt	3.52 g/t	0.23 Moz	31 Dec 2025
Inferred	0.28 Mt	4.07 g/t	0.04 Moz	31 Dec 2025
Total Resources	2.68 Mt	3.55 g/t	0.31 Moz	31 Dec 2025
Proved	0.95 Mt	4.78 g/t	0.15 Moz	31 Dec 2025
Probable	5.10 Mt	5.57 g/t	0.91 Moz	31 Dec 2025
Total Reserves	6.05 Mt	5.45 g/t	1.06 Moz	31 Dec 2025

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	0.36 Mt	14.69 g/t	0.17 Moz	31 Dec 2025
Indicated	2.04 Mt	9.16 g/t	0.60 Moz	31 Dec 2025
Inferred	0.28 Mt	11.30 g/t	0.10 Moz	31 Dec 2025
Total Resources	2.68 Mt	10.13 g/t	0.88 Moz	31 Dec 2025
Proved	0.95 Mt	13.31 g/t	0.41 Moz	31 Dec 2025
Probable

Cut-off grade

2.5000 g/t Ag · 2.5000 g/t Au · 3.0000 g/t Au

Price assumption

US$1800.00/oz · US$1600.00/oz

JORC code year

—

Peer benchmark — developing Au projects (284 with resources)Resource size P30Resource grade P89View 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$

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
Measured	0.36 Mt	3.32 g/t	0.04 Moz	14.69 g/t	0.17 Moz	31 Dec 2025	Table 3: MEASURED AND INDICATED SILVER MINERAL RESOURCESUnverified Evidence record Puerto Del Aire Measured · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 364000.0000 Grade 14.6900 Contained (oz) 172000.0000 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	0.95 Mt	4.78 g/t	0.15 Moz	13.31 g/t	0.41 Moz	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record Puerto Del Aire Proved · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 946000.0000 Grade 4.7800 Contained (oz) 145000.0000 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 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 3.00 g/t Au — Cut-off grade assumption from the source statement. @ US$ 1,600/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.
Probable	5.10 Mt	5.57 g/t	0.91 Moz	6.60 g/t	1.08 Moz	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record Puerto Del Aire Probable · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 5104000.0000 Grade 5.5700 Contained (oz) 914000.0000 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	6.05 Mt	5.45 g/t	1.06 Moz	7.65 g/t	1.49 Moz	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record Puerto Del Aire Total Reserve · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 6050000.0000 Grade 5.4500 Contained (oz) 1060000.0000 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