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2026-11-06

← NST management

Full background report

Simon Jessop

Chief Operating Officer

Career chronology

Industrial safety

Whirling Dervish fatality and corporate convictions

2020 incident; 2023 sentences · documented · high materiality

A Byrnecut worker died in July 2020 at Whirling Dervish. In December 2023 Northern Star (Carosue Dam), successor to the prior mine operator, and contractor Byrnecut pleaded guilty and were fined A$700,000 and A$850,000 respectively; a supervisor received a separate fine.

Attribution: Role overlaps event; causation unproven. Jessop was Saracen COO; the cited convictions concern the companies and a mine supervisor, not Jessop.

Relevance: Material former-employer mine safety record during operations leadership.

Whirling Dervish safety prosecution (Whirling Dervish prosecution); De Grey scheme booklet (Senior management biography); Saracen and Northern Star scheme booklet (Sections 5.8 and 7.8, fatality and COO biography); Two companies and supervisor fined after mine fatality (Corporate name change and fines)

Thunderbox fatality and pending company charges

2024 incident; 2026 charges · alleged · high materiality

WorkSafe alleges a worker died after cyanide exposure at Thunderbox in August 2024. In August 2026 it charged Northern Star Resources, Northern Star Thunderbox and the worker employer with separate offences. ABC reported that lawyers for Northern Star Resources and Coogee entered no pleas at the September hearing and the matter was adjourned until November; the outcome of the charges was not established by the cutoff.

Attribution: Role overlaps event; causation unproven. Jessop had company-wide operations and safety responsibilities. The cited charges concern companies; the sources reviewed do not establish a personal allegation or conviction against him.

Relevance: Recent material operations and safety issue, with legal outcome pending.

WorkSafe commences multiple prosecutions (Mine incident); Companies in court over workers death (Companies in court section); FY2026 annual report (Printed page 15, executive responsibilities)

2023 maintenance injury and subsidiary conviction

2023 incident; 2025 conviction · documented · medium materiality

WorkSafe records that Northern Star Mining Services pleaded guilty and received a A$750,000 global fine in April 2025 for breaches following a January 2023 serious maintenance injury. WorkSafe describes subsequent isolation training and barricading changes.

Attribution: Role overlaps event; causation unproven. Jessop held a company-wide COO role; no source attributes personal responsibility for the incident to him.

Relevance: Shows operational safety controls and documented response.

Northern Star Mining Services prosecution summary (Pages 1-3); FY2026 annual report (Printed page 15)

Suitability for the current role

Experience relevant to role

Career to 2026 · analyst inference · low materiality

Northern Star reports he previously was Saracen COO and held management positions at Evolution, Panoramic and Byrnecut, with mining engineering and survey degrees. On its face this experience is relevant to the role; the degree and employment claims are issuer-reported and are not independently verified.

Attribution: Responsibility not applicable. The relevance assessment is an analytical judgment; independent credential and full career checks remain incomplete.

Relevance: Assesses disclosed experience relevant to role.

FY2026 annual report (Printed page 15)

Evidence gaps

  • Independent university, professional membership and credential verification remains incomplete.

  • Comprehensive prior-employer chronology, company outcomes and court, regulator, fraud, safety and environmental searches remain incomplete.

  • Final Thunderbox prosecution outcome is unknown as at the research cutoff; the companies had not entered pleas at the September hearing.