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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).

Quebrada Blanca

Chile · Producing · 60.0% 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.

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	951.50 Mt	1.10 g/t	33.65 Moz	31 Dec 2025
Indicated	3,580.90 Mt	1.20 g/t	138.15 Moz	31 Dec 2025
Inferred	3,731.40 Mt	1.10 g/t	131.96 Moz	31 Dec 2025
Total Resources	8,263.80 Mt	1.14 g/t	303.77 Moz	31 Dec 2025
Proved	990.70 Mt	1.40 g/t	44.59 Moz	31 Dec 2025
Probable	339.90 Mt	1.20 g/t	13.11 Moz	31 Dec 2025
Total Reserves	1,330.60 Mt	1.35 g/t	57.71 Moz	31 Dec 2025

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	951.50 Mt	0.37%	3.52 Mt Cu	31 Dec 2025
Indicated	3,580.90 Mt	0.38%	13.61 Mt Cu	31 Dec 2025
Inferred	3,731.40 Mt	0.34%	12.69 Mt Cu	31 Dec 2025
Total Resources	8,263.80 Mt	0.36%	29.81 Mt Cu	31 Dec 2025
Proved	990.70 Mt	0.53%	5.25 Mt Cu	31 Dec 2025
Probable

Mo

Category	Tonnes (Mt)	Grade (% Mo)	Contained (Mt Mo)	As at
Measured	951.50 Mt	0.01%	0.12 Mt Mo	31 Dec 2025
Indicated	3,580.90 Mt	0.02%	0.64 Mt Mo	31 Dec 2025
Inferred	3,731.40 Mt	0.02%	0.60 Mt Mo	31 Dec 2025
Total Resources	8,263.80 Mt	0.02%	1.37 Mt Mo	31 Dec 2025
Proved	990.70 Mt	0.02%	0.21 Mt Mo	31 Dec 2025
Probable

Cut-off grade

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Price assumption

US$15.20/t · US$3.80/t

JORC code year

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Peer benchmark — producing Cu projects (98 with resources)Resource size P96Resource grade P39View 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)	Ag		Cu		Mo		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Measured	951.50 Mt	1.10 g/t	33.65 Moz	0.37%	3.52 Mt Cu	0.01%	0.12 Mt Mo	31 Dec 2025

Reserves

Category	Tonnes (Mt)	Ag		Cu		Mo		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Proved	990.70 Mt	1.40 g/t	44.59 Moz	0.53%	5.25 Mt Cu	0.02%	0.21 Mt Mo	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - SilverUnverified Evidence record Quebrada Blanca Proved · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 990700000.0000 Grade 1.4000 Contained (oz) 44592442.4758 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 (1) 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
Probable	339.90 Mt	1.20 g/t	13.11 Moz	0.50%	1.70 Mt Cu	0.02%	0.08 Mt Mo	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - MolybdenumUnverified Evidence record Quebrada Blanca Probable · Mo · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 339900000.0000 Grade 0.0240 Contained (t Mo) 81576.0000 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Molybdenum 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)
Total Reserves	1,330.60 Mt	1.35 g/t	57.71 Moz	0.52%	6.95 Mt Cu	0.02%	0.29 Mt Mo	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 Quebrada Blanca Total Reserve · Ag · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 1330600000 Grade 1.348910266045393 Contained (oz) 57706088.9862 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.