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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).

Highland Valley Copper

British Columbia, Canada · Producing · 100.0% 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.

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	303.50 Mt	0.27%	0.82 Mt Cu	31 Dec 2025
Indicated	553.70 Mt	0.25%	1.38 Mt Cu	31 Dec 2025
Inferred	289.70 Mt	0.20%	0.58 Mt Cu	31 Dec 2025
Total Resources	1,146.90 Mt	0.24%	2.78 Mt Cu	31 Dec 2025
Proved	584.70 Mt	0.30%	1.75 Mt Cu	31 Dec 2025
Probable	488.80 Mt	0.25%	1.22 Mt Cu	31 Dec 2025
Total Reserves	1,073.50 Mt	0.28%	2.98 Mt Cu	31 Dec 2025

Mo

Category	Tonnes (Mt)	Grade (% Mo)	Contained (Mt Mo)	As at
Measured	303.50 Mt	0.01%	0.03 Mt Mo	31 Dec 2025
Indicated	553.70 Mt	0.01%	0.05 Mt Mo	31 Dec 2025
Inferred	289.70 Mt	0.01%	0.03 Mt Mo	31 Dec 2025
Total Resources	1,146.90 Mt	0.01%	0.11 Mt Mo	31 Dec 2025
Proved	584.70 Mt	0.01%	0.04 Mt Mo	31 Dec 2025
Probable

Cut-off grade

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Price assumption

US$3.80/t · US$15.20/t

JORC code year

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Peer benchmark — producing Cu projects (98 with resources)Resource size P68Resource grade P20View 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)	Cu		Mo		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Measured	303.50 Mt	0.27%	0.82 Mt Cu	0.01%	0.03 Mt Mo	31 Dec 2025	MINERAL RESOURCES as at 31 December 2025 - MolybdenumUnverified Evidence record Highland Valley Copper Measured · Mo · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 303500000.0000 Grade 0.0100 Contained (t Mo) 30350.0000 Classification Resource Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESOURCES 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.

Reserves

Category	Tonnes (Mt)	Cu		Mo		As at	Source	Provenance
Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Proved	584.70 Mt	0.30%	1.75 Mt Cu	0.01%	0.04 Mt Mo	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - CopperUnverified Evidence record Highland Valley Copper Proved · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 584700000.0000 Grade 0.3000 Contained (t Cu) 1754100.0000 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Copper Published 2026-02-19 Verification Approved; not independently verified · Model extracted QA BLOCK: recomputed contained 1754100.0000 t Cu vs reported 2660000 t Cu (34.06% disagreement) \| QA FIX (claude-agent-qa): the printed 2,660 kt is the attributable RECOVERABLE-metal column, misattached to the proved row — contained recomputed from the faithful tonnes x grade; misfiled print dropped. Copies a pre-filled issue record so you can send it through your normal channel.	notes (4) Source: 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) · published 19 Feb 2026 Ref: MINERAL RESERVES as at 31 December 2025 - Copper SK-1300 — Reporting code of record: SK-1300 @ US$ 3.8/t — Metal price assumption used to derive this estimate. QA notes: QA BLOCK: recomputed contained 1754100.0000 t Cu vs reported 2660000 t Cu (34.06% disagreement) QA FIX (claude-agent-qa): the printed 2,660 kt is the attributable RECOVERABLE-metal column, misattached to the proved row — contained recomputed from the faithful tonnes x grade; misfiled print dropped.
Probable	488.80 Mt	0.25%	1.22 Mt Cu	0.01%	0.04 Mt Mo	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - MolybdenumUnverified Evidence record Highland Valley Copper Probable · Mo · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 488800000.0000 Grade 0.0090 Contained (t Mo) 43992.0000 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) · published 19 Feb 2026 Ref: MINERAL RESERVES as at 31 December 2025 - Molybdenum
Total Reserves	1,073.50 Mt	0.28%	2.98 Mt Cu	0.01%	0.08 Mt Mo	31 Dec 2025	derived from 2 rows Proved: MINERAL RESERVES as at 31 December 2025 - Copper Probable: MINERAL RESERVES as at 31 December 2025 - Copper Unverified Evidence record Highland Valley Copper Total Reserve · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 1073500000 Grade 0.27723334885887285 Contained (t Cu) 2976100 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Copper · contributes Proved 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Copper · contributes Probable Verification Approved; not independently verified · Model extracted Copies a pre-filled issue record so you can send it through your normal channel.