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Reporting assumptions

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Display scale

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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).

Antamina

Peru · Producing · 22.5% 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	98.80 Mt	9.30 g/t	29.54 Moz	31 Dec 2025
Indicated	239.90 Mt	10.90 g/t	84.07 Moz	31 Dec 2025
Inferred	1,256.30 Mt	10.50 g/t	424.11 Moz	31 Dec 2025
Total Resources	1,595.00 Mt	10.49 g/t	537.72 Moz	31 Dec 2025
Proved	260.20 Mt	9.90 g/t	82.82 Moz	31 Dec 2025
Probable	268.20 Mt	13.00 g/t	112.10 Moz	31 Dec 2025
Total Reserves	528.40 Mt	11.47 g/t	194.92 Moz	31 Dec 2025

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	98.80 Mt	0.66%	0.65 Mt Cu	31 Dec 2025
Indicated	239.90 Mt	0.83%	1.99 Mt Cu	31 Dec 2025
Inferred	1,256.30 Mt	0.97%	12.19 Mt Cu	31 Dec 2025
Total Resources	1,595.00 Mt	0.93%	14.83 Mt Cu	31 Dec 2025
Proved	260.20 Mt	0.84%	2.19 Mt Cu	31 Dec 2025
Probable

Zn

Category	Tonnes (Mt)	Grade (% Zn)	Contained (Mt Zn)	As at
Measured	14.10 Mt	1.30%	0.18 Mt Zn	31 Dec 2025
Indicated	65.00 Mt	1.70%	1.11 Mt Zn	31 Dec 2025
Inferred	267.60 Mt	1.50%	4.01 Mt Zn	31 Dec 2025
Total Resources	346.70 Mt	1.53%	5.30 Mt Zn	31 Dec 2025
Proved	48.20 Mt	1.80%	0.87 Mt Zn	31 Dec 2025
Probable

Mo

Category	Tonnes (Mt)	Grade (% Mo)	Contained (Mt Mo)	As at
Measured	84.70 Mt	0.02%	0.01 Mt Mo	31 Dec 2025
Indicated	174.90 Mt	0.02%	0.04 Mt Mo	31 Dec 2025
Inferred	988.70 Mt	0.02%	0.21 Mt Mo	31 Dec 2025
Total Resources	1,248.30 Mt	0.02%	0.26 Mt Mo	31 Dec 2025
Proved	212.00 Mt	0.03%	0.06 Mt Mo	31 Dec 2025
Probable

Cut-off grade

—

Price assumption

US$3.75/t · US$1.21/t · US$15.00/t · US$27.00/t

JORC code year

—

Peer benchmark — producing Cu projects (98 with resources)Resource size P89Resource grade P76View 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

Area	Category	Tonnes (Mt)	Ag		Cu		Zn		Mo		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Total	Measured	14.10–98.80 Mt

Reserves

Area	Category	Tonnes (Mt)	Ag		Cu		Zn		Mo		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	Grade (% Zn)	Contained (Mt Zn)	Grade (% Mo)	Contained (Mt Mo)	As at	Source	Provenance
Total	Proved	260.20 Mt	9.90 g/t	82.82 Moz	0.84%	2.19 Mt Cu	—	—	—	—	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - Copper - Antamina TotalUnverified Evidence record Antamina Proved · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 260200000.0000 Grade 0.8400 Contained (t Cu) 2185680.0000 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Copper - Antamina Total 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 - Antamina Total SK-1300 — Reporting code of record: SK-1300 @ US$ 3.75/t — Metal price assumption used to derive this estimate.
Total	Probable	268.20 Mt	13.00 g/t	112.10 Moz	0.98%	2.63 Mt Cu	—	—	—	—	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - Copper - Antamina TotalUnverified Evidence record Antamina Probable · Cu · as at 2025-12-31 Reported figure Area Whole project Basis 100% Ore tonnes (t) 268200000.0000 Grade 0.9800 Contained (t Cu) 2628360.0000 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Copper - Antamina Total 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)
Total	Total Reserves	141.50–528.40 Mt	11.47 g/t	194.92 Moz	0.91%	4.81 Mt Cu	1.87%	2.64 Mt Zn	0.03%	0.11 Mt Mo	31 Dec 2025	derived from 2 rows Proved: MINERAL RESERVES as at 31 December 2025 - Copper - Antamina Total Probable: MINERAL RESERVES as at 31 December 2025 - Copper - Antamina Total Unverified
Copper only ore OP	Proved	212.00 Mt	7.90 g/t	53.85 Moz	0.80%	1.70 Mt Cu	—	—	0.03%	0.06 Mt Mo	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - Molybdenum - AntaminaUnverified Evidence record Antamina Proved · Mo · as at 2025-12-31 Reported figure Area Copper only ore OP Basis 100% Ore tonnes (t) 212000000.0000 Grade 0.0260 Contained (t Mo) 55120.0000 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Molybdenum - Antamina 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)
Copper only ore OP	Probable	174.90 Mt	9.60 g/t	53.98 Moz	0.93%	1.63 Mt Cu	—	—	0.03%	0.05 Mt Mo	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - Molybdenum - AntaminaUnverified Evidence record Antamina Probable · Mo · as at 2025-12-31 Reported figure Area Copper only ore OP Basis 100% Ore tonnes (t) 174900000.0000 Grade 0.0300 Contained (t Mo) 52470.0000 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Molybdenum - Antamina 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)
Copper-zinc ore OP	Proved	48.20 Mt	18.70 g/t	28.98 Moz	1.02%	0.49 Mt Cu	1.80%	0.87 Mt Zn	—	—	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - Copper - AntaminaUnverified Evidence record Antamina Proved · Cu · as at 2025-12-31 Reported figure Area Copper-zinc ore OP Basis 100% Ore tonnes (t) 48200000.0000 Grade 1.0200 Contained (t Cu) 491640.0000 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Copper - Antamina 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)
Copper-zinc ore OP	Probable	93.30 Mt	19.40 g/t	58.19 Moz	1.08%	1.01 Mt Cu	1.90%	1.77 Mt Zn	—	—	31 Dec 2025	MINERAL RESERVES as at 31 December 2025 - Silver - AntaminaUnverified Evidence record Antamina Probable · Ag · as at 2025-12-31 Reported figure Area Copper-zinc ore OP Basis 100% Ore tonnes (t) 93300000.0000 Grade 19.4000 Contained (oz) 58193494.3041 Classification Reserve Source trail 40-F: 40-F — teck-20251231xexx991aif.htm (AIF, backfilled exhibit) MINERAL RESERVES as at 31 December 2025 - Silver - Antamina 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)