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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).

Zafranal

Peru · Developing · 80.0% 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	5.10 Mt	0.04 g/t	0.01 Moz	31 Dec 2025
Indicated	2.30 Mt	0.05 g/t	3.7 koz	31 Dec 2025
Inferred	62.80 Mt	0.10 g/t	0.20 Moz	31 Dec 2025
Total Resources	70.20 Mt	0.09 g/t	0.21 Moz	31 Dec 2025
Proved	408.80 Mt	0.07 g/t	0.92 Moz	31 Dec 2025
Probable	32.00 Mt	0.05 g/t	0.05 Moz	31 Dec 2025
Total Reserves	440.80 Mt	0.07 g/t	0.97 Moz	31 Dec 2025

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	5.10 Mt	0.19%	0.01 Mt Cu	31 Dec 2025
Indicated	2.30 Mt	0.21%	4.83 kt Cu	31 Dec 2025
Inferred	62.80 Mt	0.24%	0.15 Mt Cu	31 Dec 2025
Total Resources	70.20 Mt	0.24%	0.17 Mt Cu	31 Dec 2025
Proved	408.80 Mt	0.39%	1.59 Mt Cu	31 Dec 2025
Probable

Cut-off grade

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Price assumption

US$1200.00/t · US$3.00/t

JORC code year

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Peer benchmark — developing Cu projects (124 with resources)Resource size P42Resource grade P28View 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		Cu		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (% Cu)	Contained (Mt Cu)	As at	Source	Provenance
Measured	5.10 Mt	0.04 g/t	0.01 Moz	0.19%	0.01 Mt Cu	31 Dec 2025	MINERAL RESOURCES as at 31 December 2025 - CopperUnverified Evidence record Zafranal Measured · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 5100000.0000 Grade 0.1900 Contained (t Cu) 9690.0000 Classification Resource Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESOURCES as at 31 December 2025 - Copper 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.

Reserves

Category	Tonnes (Mt)	Au		Cu		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (% Cu)	Contained (Mt Cu)	As at	Source	Provenance
Proved	408.80 Mt	0.07 g/t	0.92 Moz	0.39%	1.59 Mt Cu	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - GoldUnverified Evidence record Zafranal Proved · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 408800000.0000 Grade 0.0700 Contained (oz) 920025.7638 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Gold 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 - Gold SK-1300 — Reporting code of record: SK-1300 @ US$ 1,200/oz — Metal price assumption used to derive this estimate.
Probable	32.00 Mt	0.05 g/t	0.05 Moz	0.21%	0.07 Mt Cu	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - GoldUnverified Evidence record Zafranal Probable · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 32000000.0000 Grade 0.0500 Contained (oz) 51441.1945 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Gold 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 - Gold
Total Reserves	440.80 Mt	0.07 g/t	0.97 Moz	0.38%	1.66 Mt Cu	31 Dec 2025	derived from 2 rows Proved: MINERAL RESERVES as at 31 December 2025 - Gold Probable: MINERAL RESERVES as at 31 December 2025 - Gold Unverified Evidence record Zafranal Total Reserve · Au · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 440800000 Grade 0.0685480943738657 Contained (oz) 971466.9582999999 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Gold · contributes Proved 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Gold · contributes Probable Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.