View settings100% · M+I+I · Resources excl. reserves · Native commodities

Reporting assumptions

These choices persist and are added to shared URLs.

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).

Tantahuatay Sulfides

Cajamarca, Peru · Developing · 40.1% 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	204.49 Mt	0.28 g/t	1.84 Moz	31 Dec 2025
M&I = Measured + Indicated (overlaps both)	133.59 Mt	0.27 g/t	1.15 Moz	31 Dec 2024
Inferred	741.40 Mt	0.16 g/t	3.74 Moz	31 Dec 2025
Total Resources	945.89 Mt	0.19 g/t	5.57 Moz	31 Dec 2025
Proved	—	—	—	—
Probable	—	—	—	—
Total Reserves	—	—	—	—

M&I is the issuer's printed Measured + Indicated subtotal — it overlaps the Measured and Indicated rows and is never added alongside them; the Total rows and every rollup already exclude it.

Ag

Category	Tonnes (Mt)	Grade (g/t Ag)	Contained (Moz Ag)	As at
Measured	—	—	—	—
Indicated	204.49 Mt	9.56 g/t	62.85 Moz	31 Dec 2025
M&I = Measured + Indicated (overlaps both)	133.59 Mt	10.24 g/t	43.99 Moz	31 Dec 2024
Inferred	741.40 Mt	6.83 g/t	162.72 Moz	31 Dec 2025
Total Resources	945.89 Mt

Cu

Category	Tonnes (Mt)	Grade (% Cu)	Contained (Mt Cu)	As at
Measured	—	—	—	—
Indicated	204.49 Mt	0.61%	1.25 Mt Cu	31 Dec 2025
M&I = Measured + Indicated (overlaps both)	133.59 Mt	0.59%	0.79 Mt Cu	31 Dec 2024
Inferred	741.40 Mt	0.35%	2.63 Mt Cu	31 Dec 2025
Total Resources	945.89 Mt

Cut-off grade

7.7600 g/t Au · 7.7600 g/t Ag · 7.7600 % Cu

Price assumption

—

JORC code year

—

Peer benchmark — developing Cu projects (124 with resources)Resource size P82Resource grade P51View 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: 20-F: 20-F · 31 Dec 2025
Reporting code: SK-1300
Convention: mixed
Currency assumption: US$
Disagreement flags: 2 rows

Current R&R

Resources

Category	Tonnes (Mt)	Au		Ag		Cu		As at	Source	Provenance
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
Indicated	204.49 Mt	0.28 g/t	1.84 Moz	9.56 g/t	62.85 Moz	0.61%	1.25 Mt Cu	31 Dec 2025

M&I = Measured + Indicated (overlaps both)

133.59 Mt

0.27 g/t

1.15 Moz

10.24 g/t

43.99 Moz

0.59%

0.79 Mt Cu

31 Dec 2024

Tantahuatay Sulfides – Year End Mineral Resources as of December 31, 2024 (on a 100% ownership basis)Unverified

notes (5)

Source: 20-F: 20-F · published 30 Apr 2025

Ref: Tantahuatay Sulfides – Year End Mineral Resources as of December 31, 2024 (on a 100% ownership basis)

SK-1300 — Reporting code of record: SK-1300
Cutoff 7.76 g/t Au — Cut-off grade assumption from the source statement.
inc — Stated Resources are inclusive of Reserves. Set Resources: Excl. Reserves to net them out.

QA notes:

tranche12b QA: printed Subtotal row, cross-foots approved singles
t83 print-round FIX (p2): Tantahuatay Sulfides - Year End Mineral Resources as of December 31, 2024 (100% ownership basis): printed 'Subtotal 133,588,876 t / Au 0.27 g/t / Ag 10.24 g/t / Cu 0.59% / Au 1,148,382 Oz / Ag 43,985,300 Oz / Cu 786,018 t'; the Measured line prints blank so the Subtotal equals the Indicated line; EXCLUDES the separately printed Inferred 601,207,140 t - printed Subtotal line is a combined Measured-and-Indicated aggregate, not a total resource; re-key to m_and_i per the migration-0030 convention applied in t77a (GFI x5, FM/OLA x30). Figures/grades/as_at/mining_area verified correct against the print - no other field changes.

Tantahuatay Sulfides

Current R&R by category

Au

Ag

Cu

Data quality

Current R&R

Resources