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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 Nicolás

Zacatecas, Mexico · Developing · 50.0% 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	0.50 Mt	0.08 g/t	1.29 koz	31 Dec 2025
Indicated	6.10 Mt	0.20 g/t	0.04 Moz	31 Dec 2025
Inferred	4.90 Mt	0.13 g/t	0.02 Moz	31 Dec 2025
Total Resources	11.50 Mt	0.16 g/t	0.06 Moz	31 Dec 2025
Proved	47.70 Mt	0.41 g/t	0.63 Moz	31 Dec 2025
Probable	57.50 Mt	0.39 g/t	0.72 Moz	31 Dec 2025
Total Reserves	105.20 Mt	0.40 g/t	1.35 Moz	31 Dec 2025

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	0.50 Mt	6.40 g/t	0.10 Moz	31 Dec 2025
Indicated	6.10 Mt	11.90 g/t	2.33 Moz	31 Dec 2025
Inferred	4.90 Mt	9.30 g/t	1.47 Moz	31 Dec 2025
Total Resources	11.50 Mt	10.55 g/t	3.90 Moz	31 Dec 2025
Proved	47.70 Mt	23.90 g/t	36.65 Moz	31 Dec 2025
Probable

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	0.50 Mt	1.35%	0.01 Mt Cu	31 Dec 2025
Indicated	6.10 Mt	1.17%	0.07 Mt Cu	31 Dec 2025
Inferred	4.90 Mt	0.94%	0.05 Mt Cu	31 Dec 2025
Total Resources	11.50 Mt	1.08%	0.12 Mt Cu	31 Dec 2025
Proved	47.70 Mt	1.26%	0.60 Mt Cu	31 Dec 2025
Probable

Zn

Category	Tonnes (Mt)	Grade (% Zn)	Contained (Mt Zn)	As at
Measured	0.50 Mt	0.40%	2 kt Zn	31 Dec 2025
Indicated	6.10 Mt	0.70%	0.04 Mt Zn	31 Dec 2025
Inferred	4.90 Mt	0.60%	0.03 Mt Zn	31 Dec 2025
Total Resources	11.50 Mt	0.64%	0.07 Mt Zn	31 Dec 2025
Proved	47.70 Mt	1.60%	0.76 Mt Zn	31 Dec 2025
Probable

Cut-off grade

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Price assumption

US$20.00/t · US$1300.00/t · US$3.00/t · US$1.10/t

JORC code year

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Peer benchmark — developing Cu projects (124 with resources)Resource size P34Resource grade P82View 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: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) · 31 Dec 2025
Reporting code: SK-1300
Convention: exclusive
Currency assumption: US$

Current R&R

Resources

Category	Tonnes (Mt)	Au		Ag		Cu		Zn		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	As at	Source	Provenance
Measured	0.50 Mt	0.08 g/t	1.29 koz	6.40 g/t	0.10 Moz	1.35%

Reserves

Category	Tonnes (Mt)	Au		Ag		Cu		Zn		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	As at	Source	Provenance
Proved	47.70 Mt	0.41 g/t	0.63 Moz	23.90 g/t	36.65 Moz	1.26%	0.60 Mt Cu	1.60%	0.76 Mt Zn	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - SilverUnverified Evidence record San Nicolás Proved · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 47700000.0000 Grade 23.9000 Contained (oz) 36652815.6106 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Silver Published 2026-02-19 Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.	notes (2) Source: 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) · published 19 Feb 2026 Ref: MINERAL RESERVES as at 31 December 2025 - Silver SK-1300 — Reporting code of record: SK-1300 @ US$ 20/oz — Metal price assumption used to derive this estimate.
Probable	57.50 Mt	0.39 g/t	0.72 Moz	20.90 g/t	38.64 Moz	1.01%	0.58 Mt Cu	1.40%	0.81 Mt Zn	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - SilverUnverified Evidence record San Nicolás Probable · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 57500000.0000 Grade 20.9000 Contained (oz) 38637159.6888 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Silver Published 2026-02-19 Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.	notes (2) Source:
Total Reserves	105.20 Mt	0.40 g/t	1.35 Moz	22.26 g/t	75.29 Moz	1.12%	1.18 Mt Cu	1.49%	1.57 Mt Zn	31 Dec 2025	derived from 2 rows Proved: MINERAL RESERVES as at 31 December 2025 - Silver Probable: MINERAL RESERVES as at 31 December 2025 - Silver Unverified Evidence record San Nicolás Total Reserve · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 105200000 Grade 22.260266159695817 Contained (oz) 75289975.2994 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Silver · contributes Proved 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Silver · contributes Probable Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.