# Sergio Rotondo Executive Vice Chair ## 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 [sergio_hualilan_origin] 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 [sergio_hualilan_toll] 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 [sergio_fit] 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.