View settings100% · M+I+I · Resources excl. reserves · Native commodities

Reporting assumptions

These choices persist and are added to shared URLs.

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).

Young-Davidson

Ontario, Canada · 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.

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	5.91 Mt	2.52 g/t	0.48 Moz	31 Dec 2025
Indicated	8.80 Mt	3.57 g/t	1.01 Moz	31 Dec 2025
Inferred	1.41 Mt	3.67 g/t	0.17 Moz	31 Dec 2025
Total Resources	16.12 Mt	3.20 g/t	1.66 Moz	31 Dec 2025
Proved	12.46 Mt	2.18 g/t	0.87 Moz	31 Dec 2025
Probable	29.73 Mt	2.21 g/t	2.11 Moz	31 Dec 2025
Total Reserves	42.18 Mt	2.20 g/t	2.98 Moz	31 Dec 2025

Cut-off grade

1.3900 g/t Au · 0.5000 g/t Au · 1.5700 g/t Au

Price assumption

US$2000.00/oz · US$1400.00/oz · US$1800.00/oz

JORC code year

—

Peer benchmark — producing Au projects (282 with resources)Resource size P48Resource grade P76View 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: 1 row

Current R&R

Resources

Area	Category	Tonnes (Mt)	Au		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at	Source	Provenance
Total	Inferred	1.41 Mt	3.67 g/t	0.17 Moz	31 Dec 2025	Table 4: INFERRED GOLD MINERAL RESOURCES – Total Young-DavidsonUnverified Evidence record Young-Davidson Inferred · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 1413000.0000 Grade 3.6700 Contained (oz) 167000.0000 Classification Resource Source trail Alamos Gold Reports Mineral Reserves and Resources for the Year-Ended 2025 Table 4: INFERRED GOLD MINERAL RESOURCES – Total Young-Davidson Published 2026-02-17 Verification Approved; not independently verified · Model extracted QA WARN: tonnes/contained equal the SUM of 2 sibling row(s) of the same classification/category/commodity (Surface, Underground) — likely a printed multi-deposit rollup/subtotal. Policy keeps leaf rows and printed whole-project Totals only; reject mid-level rollups (double-count). Copies a pre-filled issue record so you can send it through your normal channel.

Reserves

Area	Category	Tonnes (Mt)	Au		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at	Source	Provenance
Total	Proved	12.46 Mt	2.18 g/t	0.87 Moz	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record Young-Davidson Proved · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 12457000.0000 Grade 2.1800 Contained (oz) 873000.0000 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 1.57 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.
Total	Probable	29.73 Mt	2.21 g/t	2.11 Moz	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record Young-Davidson Probable · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 29727000.0000 Grade 2.2100 Contained (oz) 2109000.0000 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
Total	Total Reserves	42.18 Mt	2.20 g/t	2.98 Moz	31 Dec 2025	Table 1: Total Proven and Probable Mineral Reserves as of December 31, 2025Unverified Evidence record Young-Davidson Total Reserve · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 42184000.0000 Grade 2.2000 Contained (oz) 2983000.0000 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