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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).

Storm Copper

Nunavut, Canada · Exploring · 20.0% 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	—	—	—	—
Indicated	8.23 Mt	4.48 g/t	1.19 Moz	07 Feb 2025
Inferred	3.33 Mt	3.11 g/t	0.33 Moz	07 Feb 2025
Total Resources	11.56 Mt	4.08 g/t	1.52 Moz	07 Feb 2025
Proved	—	—	—	—
Probable	—	—	—	—
Total Reserves	—	—	—	—

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	—	—	—	—
Indicated	8.23 Mt	1.47%	0.12 Mt Cu	07 Feb 2025
Inferred	3.33 Mt	1.30%	0.04 Mt Cu	07 Feb 2025
Total Resources	11.56 Mt	1.42%	0.16 Mt Cu	07 Feb 2025
Proved	—	—	—	—
Probable

Cut-off grade

0.3500 % Cu · 0.3500 g/t Ag · 1.0000 g/t Ag · 1.0000 % Cu

Price assumption

—

JORC code year

—

Peer benchmark — exploring Cu projects (113 with resources)Resource size P44Resource grade P93View 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: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · 07 Feb 2025
Reporting code: unknown
Convention: unknown
Currency assumption: US$
Disagreement flags: 1 row

Current R&R

Resources

Area	Category	Tonnes (Mt)	Ag		Cu		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	As at	Source	Provenance
Total	Indicated	8.23 Mt	4.48 g/t	1.19 Moz	1.47%	0.12 Mt Cu	07 Feb 2025	Table 1: Indicated and Inferred Mineral Resource Estimate — Combined Constrained, Indicated, Global

Chinook Open Pit

Indicated

0.71 Mt

4.36 g/t

0.10 Moz

2.07%

0.01 Mt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Chinook, Open Pit, IndicatedUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Chinook, Open Pit, Indicated

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 % Cu — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 3 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=7073000 conf=0.95, t=7785000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 3 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Chinook Open Pit
matches printed Chinook line (712 kt, 2.07% Cu, 14,700 t)

Chinook Open Pit

Inferred

0.14 Mt

2.86 g/t

0.01 Moz

1.45%

2 kt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Chinook, Open Pit, InferredUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Chinook, Open Pit, Inferred

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 g/t Ag — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 7 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=505000 conf=0.95, t=791000 conf=0.95, t=532000 conf=0.95, t=189000 conf=0.95, t=756000 conf=0.95, t=2908000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 7 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Chinook Open Pit
matches printed Chinook line (135 kt, 2.86, 12,400 oz)

Cirrus Open Pit

Inferred

0.51 Mt

1.29 g/t

0.02 Moz

0.65%

3.3 kt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Cirrus, Open Pit, InferredUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Cirrus, Open Pit, Inferred

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 % Cu — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 7 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=135000 conf=0.95, t=791000 conf=0.95, t=532000 conf=0.95, t=189000 conf=0.95, t=756000 conf=0.95, t=2908000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 7 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Cirrus Open Pit
matches printed Cirrus line (505 kt, 0.65% Cu, 3,300 t)

Corona Open Pit

Inferred

0.79 Mt

1.53 g/t

0.04 Moz

1.07%

0.01 Mt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Corona, Open Pit, InferredUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Corona, Open Pit, Inferred

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 % Cu — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 7 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=135000 conf=0.95, t=505000 conf=0.95, t=532000 conf=0.95, t=189000 conf=0.95, t=756000 conf=0.95, t=2908000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 7 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Corona Open Pit
matches printed Corona line (791 kt, 1.07% Cu, 8,400 t)

Cyclone Open Pit

Indicated

7.07 Mt

4.50 g/t

1.02 Moz

1.41%

0.10 Mt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Cyclone, Open Pit, IndicatedUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Cyclone, Open Pit, Indicated

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 % Cu — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 3 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=712000 conf=0.95, t=7785000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 3 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Cyclone Open Pit
matches printed Cyclone line (7,073 kt, 1.41% Cu, 99,700 t)

Cyclone Open Pit

Inferred

0.53 Mt

6.48 g/t

0.11 Moz

1.77%

0.01 Mt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Cyclone, Open Pit, InferredUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Cyclone, Open Pit, Inferred

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 g/t Ag — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 7 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=135000 conf=0.95, t=505000 conf=0.95, t=791000 conf=0.95, t=189000 conf=0.95, t=756000 conf=0.95, t=2908000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 7 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Cyclone Open Pit
matches printed Cyclone line (532 kt, 6.48, 110,800 oz)

Lightning Ridge Open Pit

Inferred

0.19 Mt

5.17 g/t

0.03 Moz

1.33%

2.5 kt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Lightning Ridge, Open Pit, InferredUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Lightning Ridge, Open Pit, Inferred

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 % Cu — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 7 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=135000 conf=0.95, t=505000 conf=0.95, t=791000 conf=0.95, t=532000 conf=0.95, t=756000 conf=0.95, t=2908000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 7 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Lightning Ridge Open Pit
matches printed Lightning Ridge line (189 kt, 1.33% Cu, 2,500 t)

Thunder Open Pit

Inferred

0.76 Mt

2.04 g/t

0.05 Moz

1.48%

0.01 Mt Cu

07 Feb 2025

Table 1: Indicated and Inferred Mineral Resource Estimate — Thunder, Open Pit, InferredUnverified

notes (5)

Source: Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate · published 17 Apr 2025

Ref: Table 1: Indicated and Inferred Mineral Resource Estimate — Thunder, Open Pit, Inferred

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.35 g/t Ag — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: 7 rows share this exact identity in this document with CONFLICTING figures (sibling copies: t=135000 conf=0.95, t=505000 conf=0.95, t=791000 conf=0.95, t=532000 conf=0.95, t=189000 conf=0.95, t=2908000 conf=0.95) — at most one matches the print; the others are likely fabricated duplicates (verify against the printed table and reject the copies that do not appear). QA BLOCK: conflicting duplicate — this (project, mining area, commodity, classification, category, as-at date) appears 7 times in the document WITH DIFFERENT figures. At most one copy matches the print; verify each against the document and reject the rest (a copy whose figures appear nowhere in the text is fabricated).
QA fix: area=Thunder Open Pit
matches printed Thunder line (756 kt, 2.04, 49,600 oz)