Sergio Rotondo

Career chronology

• Executive director disclosed since Sep 2021; current as of selected roster: Challenger Gold — Co-founder and Executive Vice Chair. Interim Report for half year ended 30 June 2026 (Corporate directory); Completion of Hualilan Toll Milling Pre-Feasibility Study (Directors list)

• Founded 2018; company consolidated Hualilan before Challenger acquisition: Golden Mining SA — Founder. Directors & Management (Sergio Rotondo biography); Interview with Sonia Delgado, Executive Director (Delgado account of operating-company relationship)

Contributions and company outcomes

Founded Golden Mining, which consolidated the Hualilan project

2018 onward · issuer reported · medium materiality

Challenger’s biography states Rotondo founded Golden Mining SA, which originally consolidated 100% of Hualilan; dated 2023 interview coverage also describes Golden Mining’s project acquisition and legal unblocking. This is a company-reported origin story; underlying title chain/legal resolutions were not separately reviewed.

Attribution: Individual involvement documented. Issuer biography directly links him as founder to the company that consolidated the asset; it does not establish sole responsibility for subsequent exploration/approval.

Relevance: Material project-generation and local stakeholder context.

Directors & Management (Sergio Rotondo biography); Interview with Sonia Delgado, Executive Director (Delgado describes Golden Mining operating structure)

Hualilan advanced to a toll-milling PFS and first production

2025–2026 · issuer reported · medium materiality

During Rotondo’s executive tenure, Challenger published a 2025 toll-milling PFS estimating positive project economics under stated assumptions and in June 2026 poured first doré. The PFS was an externally authored technical study; Rotondo’s individual causal contribution is not isolated.

Attribution: Role overlaps event; causation unproven. Executive vice chair tenure overlaps project strategy and advance; the reports do not connect him personally to mine design or operating decisions.

Relevance: Evidence of company milestone delivery, qualified by later strategic reset and discontinuation of toll arrangement.

Completion of Hualilan Toll Milling Pre-Feasibility Study (PFS key outcomes, study approach); First Gold Pour at Hualilan (ASX release dated 2 June 2026)

Suitability for the current role

Project-origin and construction background is relevant to strategic oversight

2018–2026 · analyst inference · medium materiality

Challenger reports Rotondo’s billion-dollar construction-project experience and economics/MBA qualifications; he founded the vehicle that consolidated Hualilan. Those biographical claims support strategic fit but do not establish mine construction or producing-mine performance personally.

Attribution: Responsibility not applicable. Judgment from issuer career profile; no independent construction-project list or outcome benchmark reviewed.

Relevance: Relevant to project strategy and local origin; detailed biography remains issuer-reported.

Directors & Management (Sergio Rotondo biography)

Evidence gaps

• Role chronology and education rely partly on issuer biographies; dates and credentials require primary-source confirmation where not specifically documented.

• Person-specific court, regulator, sanctions, professional-discipline and safety/environment register searches were not exhaustive.

• Hualilan technical and economic outcomes are project-level; no source establishes sole personal responsibility for outcomes.

• Company transition and counterpart disclosures are reported distinctly; no denial or allegation has been treated as an independent finding.