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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).

Andacollo

Chile · Producing · 90.0% 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	78.50 Mt	0.10 g/t	0.25 Moz	31 Dec 2025
Indicated	313.60 Mt	0.09 g/t	0.91 Moz	31 Dec 2025
Inferred	79.60 Mt	0.08 g/t	0.20 Moz	31 Dec 2025
Total Resources	471.70 Mt	0.09 g/t	1.36 Moz	31 Dec 2025
Proved	122.30 Mt	0.10 g/t	0.39 Moz	31 Dec 2025
Probable	112.50 Mt	0.10 g/t	0.36 Moz	31 Dec 2025
Total Reserves	234.80 Mt	0.10 g/t	0.75 Moz	31 Dec 2025

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	78.50 Mt	0.28%	0.22 Mt Cu	31 Dec 2025
Indicated	313.60 Mt	0.25%	0.78 Mt Cu	31 Dec 2025
Inferred	79.60 Mt	0.25%	0.20 Mt Cu	31 Dec 2025
Total Resources	471.70 Mt	0.25%	1.20 Mt Cu	31 Dec 2025
Proved	122.30 Mt	0.31%	0.38 Mt Cu	31 Dec 2025
Probable

Cut-off grade

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Price assumption

US$3.80/t · US$1970.00/t

JORC code year

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Peer benchmark — producing Cu projects (98 with resources)Resource size P51Resource grade P21View 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	78.50 Mt	0.10 g/t	0.25 Moz	0.28%	0.22 Mt Cu	31 Dec 2025	MINERAL RESOURCES as at 31 December 2025 - CopperUnverified Evidence record Andacollo Measured · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 78500000.0000 Grade 0.2800 Contained (t Cu) 219800.0000 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	122.30 Mt	0.10 g/t	0.39 Moz	0.31%	0.38 Mt Cu	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - CopperUnverified Evidence record Andacollo Proved · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 122300000.0000 Grade 0.3100 Contained (t Cu) 379130.0000 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 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 - Copper SK-1300 — Reporting code of record: SK-1300 @ US$ 3.8/t — Metal price assumption used to derive this estimate.
Probable	112.50 Mt	0.10 g/t	0.36 Moz	0.28%	0.32 Mt Cu	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - CopperUnverified Evidence record Andacollo Probable · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 112500000.0000 Grade 0.2800 Contained (t Cu) 315000.0000 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 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 - Copper
Total Reserves	234.80 Mt	0.10 g/t	0.75 Moz	0.30%	0.69 Mt Cu	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 Andacollo Total Reserve · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 234800000 Grade 0.2956260647359455 Contained (t Cu) 694130 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.