Colin Mackey

Career chronology

• Current role; start date not stated in selected roster: Cyprium Metals Limited — Chief Operating Officer. Diggers & Dealers Presentation (Slide 17, board and management; 4 August 2026)

• Previous role; dates not stated: Gold Fields — Mining role. Key management team (Named professional biography)

• Previous role; dates not stated: BHP — Mining role. Key management team (Named professional biography)

• Previous role; dates not stated: Thiess — Mining role. Key management team (Named professional biography)

• Joined 2003: Rio Tinto — Construction, development and operational improvement roles. Key management team (Named professional biography)

Contributions and company outcomes

Acid commissioning of Nifty heaps

2026-09-14 · issuer reported · medium materiality

The issuer reported acid commissioning of nifty heaps: commenced. This records an employer-level event; the reviewed evidence does not attribute the event to Colin Mackey individually.

Attribution: Role overlaps event; causation unproven. The event occurred at the issuer level during the documented period; no source establishes this executive’s individual contribution or causal responsibility.

Relevance: Context for delivery and oversight in the current role; do not treat it as personal performance evidence.

Operations Update - Phase 1 Cathode Restart Project (page 1, Highlights and page 3)

Business failures and setbacks

Jadar licensing setback and later status

2021–2026 · documented · medium materiality

Mackey led Rio Tinto European operations from October 2021 and was subsequently identified by Cyprium as managing director of Jadar and European operations. In January 2022 Serbia revoked the Jadar spatial plan after environmental protests. The Constitutional Court overturned the repeal in July 2024, and Rio later said it placed Jadar in care and maintenance. Exact Jadar-specific appointment and departure dates have not been independently established.

Attribution: Role overlaps event; causation unproven. Mackey’s European role overlapped the 2022 setback; the precise scope of his Jadar responsibility and any personal contribution are unproven. The 2024 court ruling and later company decision occurred after his Rio role, based on the issuer’s 2024 Cyprium COO profile.

Relevance: A former project’s difficult permitting and stakeholder context illustrates delivery and social-licence exposure, not personal wrongdoing.

Mining Report Glückauf 1/2023 (Issue 1/2023, Colin Mackey interview); Government revokes spatial plan for Jadar (20 January 2022 government announcement); Constitutional Court decision IUo-39/2022 (Decision dated 11 July 2024); Rio Tinto 2025 annual report (Page 16, financial review); Key management team (Mackey biography)

Suitability for the current role

Role fit based on documented experience

As of 2026-10-31 · analyst inference · low materiality

Reported mining engineering experience and European project leadership are relevant to operating a complex restart, subject to the Jadar permitting context and incomplete exact tenure dates.

Attribution: Responsibility not applicable. This is an evidence-limited analyst judgment, not an adverse claim about the executive.

Relevance: Role-specific experience and credentials are central to assessing the current position; the available record is insufficient for a positive or negative conclusion.

Key management team (Mackey biography)

Evidence gaps

• Prior-employer dates and personal contribution to company outcomes are incompletely corroborated. Searches are screening-level and do not constitute court, sanctions or criminal clearance.

• Exact start and end dates of the Jadar-specific role and individual responsibility for project decisions remain unverified; the 2024 reversal and subsequent care-and-maintenance decision are later company events.