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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).

Moonlight-Superior

California, United States · Developing · 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.

Au

Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	As at
Measured	—	—	—	—
Indicated	365.44 Mt	0.01 g/t	0.14 Moz	15 Sept 2024
Inferred	58.60 Mt	0.01 g/t	0.01 Moz	15 Sept 2024
Total Resources	424.04 Mt	0.01 g/t	0.15 Moz	15 Sept 2024
Proved	—	—	—	—
Probable	—	—	—	—
Total Reserves	—	—	—	—

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	—	—	—	—
Indicated	365.44 Mt	1.85 g/t	21.69 Moz	15 Sept 2024
Inferred	58.60 Mt	0.77 g/t	1.45 Moz	15 Sept 2024
Total Resources	424.04 Mt	1.70 g/t	23.14 Moz	15 Sept 2024
Proved	—	—	—	—
Probable

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	—	—	—	—
Indicated	365.44 Mt	0.31%	1.15 Mt Cu	15 Sept 2024
Inferred	58.60 Mt	0.31%	0.18 Mt Cu	15 Sept 2024
Total Resources	424.04 Mt	0.31%	1.33 Mt Cu	15 Sept 2024
Proved	—	—	—	—
Probable

Cut-off grade

0.1600 % Cu · 10.4500 % Cu · 10.4500 g/t Ag · 0.1600 g/t Au · 10.4500 g/t Au · 0.1600 g/t Ag

Price assumption

—

JORC code year

—

Peer benchmark — developing Cu projects (124 with resources)Resource size P67Resource grade P40View 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: US Copper Corp Reports Updated Mineral Resource Estimate for Moonlight-Superior Project · 15 Sept 2024
Reporting code: unknown
Convention: unknown
Currency assumption: US$
Disagreement flags: 26 rows

Current R&R

Resources

Area	Category	Tonnes (Mt)	Au		Ag		Cu		As at	Source	Provenance
Area	Category	Tonnes (Mt)	Grade (g/t Au)	Contained (Moz Au)	Grade (g/t Ag)	Contained (Moz Ag)	Grade (% Cu)	Contained (Mt Cu)	As at	Source	Provenance
Total	Indicated	365.44 Mt	0.01 g/t	0.14 Moz	1.85 g/t	21.69 Moz	0.31%

Total

Inferred

58.60 Mt

0.01 g/t

0.01 Moz

0.77 g/t

1.45 Moz

0.31%

0.18 Mt Cu

15 Sept 2024

Table 1 – Inferred TotalUnverified

notes (4)

Source: US Copper Corp Reports Updated Mineral Resource Estimate for Moonlight-Superior Project · published 25 Nov 2024

Ref: Table 1 – Inferred Total

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.16 g/t Ag — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: tonnes/contained equal the SUM of 3 sibling row(s) of the same classification/category/commodity (Engels Oxide, Engels Transition, Total Sulfide) — likely a printed multi-deposit rollup/subtotal. Policy keeps leaf rows and printed whole-project Totals only; reject mid-level rollups (double-count). QA INFO: short-ton document — printed tonnage/contained were US short tons; converted x0.90718474 to metric tonnes deterministically at parse (grade unchanged).
t88 swarm r2 (a5): F3 case(a) commodity coverage, no defect: whole-project inferred 58,595,062 t; Ag is not reported at Copper Mountain Sulfide (3,538,020 t) or Lambs Ridge Sulfide (3,138,859 t), leaving 51,918,183 t. Printed Ag contained cross-foots to the OUNCE: 55,046 + 1,027,412 + 281,158 + 81,857 + 2,681 = 1,448,154 = the printed total.

Engels Oxide

Indicated

2.17 Mt

0.06 g/t

4.05 koz

7.72 g/t

0.57 Moz

0.81%

0.02 Mt Cu

15 Sept 2024

Table 1 – Indicated ResourcesUnverified

notes (19)

Source: US Copper Corp Reports Updated Mineral Resource Estimate for Moonlight-Superior Project · published 25 Nov 2024

Ref: Table 1 – Indicated Resources

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.16 % Cu — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: recomputed contained 17562.1894 t Cu vs reported 18534.23783057000 t Cu (5.24% disagreement) QA INFO: short-ton document — printed tonnage/contained were US short tons; converted x0.90718474 to metric tonnes deterministically at parse (grade unchanged).
QA annotate (t98v, a5.txt): "Engels
Oxide
0.16
%
2.39
0.81
40,861
7.72
565,232
0.055
4,050 |". Stored c=18,534.2378 t is exactly 40,861 klb x 0.45359237; over 2,168,172 t (2.39M short tons) that implies 0.8548% Cu against the printed 0.81%. Print granularity is ~0.3% (3-sf mass, 5-sf content) so this is the print, not rounding. Corroboration: the printed "Total
Oxide
... 3.74
0.68
51,104 ..." row IS self-consistent (51,104 klb over 3.74M tons = 0.683%) yet its two components printed at 0.81 and 0.36 weight to 0.648 — the deposit grade column is low by construction.

Engels Oxide

Inferred

0.14 Mt

0.01 g/t

0.05 koz

11.91 g/t

0.06 Moz

1.18%

1.7 kt Cu

15 Sept 2024

Table 1 – Inferred ResourcesUnverified

notes (13)

Source: US Copper Corp Reports Updated Mineral Resource Estimate for Moonlight-Superior Project · published 25 Nov 2024

Ref: Table 1 – Inferred Resources

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.16 % Cu — Cut-off grade assumption from the source statement.

QA notes:

QA WARN: recomputed contained 1605.7170 t Cu vs reported 1696.43546380000 t Cu (5.35% disagreement) QA INFO: short-ton document — printed tonnage/contained were US short tons; converted x0.90718474 to metric tonnes deterministically at parse (grade unchanged).
QA annotate (t98v, a5.txt): Same twin pair, Cu: deposit "Engels
Oxide
... 0.15
1.18
3,740 ..." vs roll-up "Total
Oxide
... 0.15
1.25
3,740 ...". Stored c=1,696.4355 t is exactly 3,740 klb x 0.45359237 kg/lb (the named conversion artifact); over 136,078 t (0.15M short tons) that implies 1.2467%, i.e. the Total row's printed 1.25, not the deposit row's 1.18.
t98v

Engels Transition

Inferred

1.57 Mt

0.02 g/t

1.05 koz

5.20 g/t

0.28 Moz

0.49%

0.01 Mt Cu

15 Sept 2024

Table 1 – Inferred ResourcesUnverified

notes (25)

Source: US Copper Corp Reports Updated Mineral Resource Estimate for Moonlight-Superior Project · published 25 Nov 2024

Ref: Table 1 – Inferred Resources

Unknown code — Reporting code not yet captured for this row.
Cutoff 0.16 g/t Ag — Cut-off grade assumption from the source statement.

QA notes:

QA BLOCK: recomputed contained 262383.3333 oz vs reported 281158 oz (6.68% disagreement) QA INFO: short-ton document — printed tonnage/contained were US short tons; converted x0.90718474 to metric tonnes deterministically at parse (grade unchanged).
QA annotate (t98v, a5.txt): The document prints the SAME mass and the SAME content twice with two different grades. Deposit line: "Engels
Transition
0.16
%
1.73
0.49
18,287
5.20
281,158
0.019
1,053 |"; roll-up line (Engels is the only inferred transition contributor, so it is the same material): "Total
Transition
0.16
%
1.73
0.53
18,287
5.58
281,158