# Hayden Locke

Chief Executive Officer and Director

## Career chronology

- **Current role; exact role start is not established: Marimaca Copper** — Chief Executive Officer and Director. [Hayden Locke management page](<https://marimaca.com/hayden-locke/>) (Hayden Locke biography)

## Personal achievements

### Relevant reported experience [locke_career]

Career to October 2026 · issuer reported · medium materiality

Marimaca says he joined as president in July 2020 and became CEO in April 2021; earlier positions include Emmerson CEO, Papillon corporate head, and Highfield corporate and technical services.

**Attribution:** Individual involvement documented. The role history is issuer-reported; individual contribution and employment dates are not fully independently established.

**Relevance:** Relevant to the present mining, financing, legal or project role.

[Hayden Locke management page](<https://marimaca.com/hayden-locke/>) (Hayden Locke biography)

## Business failures and setbacks

### Emmerson Khemisset permit refusal and arbitration [locke_emmerson]

2024–August 2026 · documented · high materiality

Emmerson, where Locke is chairman, reported the project environmental approval was refused in October 2024 and recorded a US$21.1 million impairment for 2024. Its subsidiaries seek US$1.215 billion in arbitration against Morocco. In July 2026 the tribunal refused a separate preliminary phase for jurisdiction; this was procedural, not a merits decision. An August report records a 2028 hearing timetable.

**Attribution:** Role overlaps event; causation unproven. Locke is chair; the sources do not establish personal culpability or determine the parties’ disputed claims.

**Relevance:** Shows a material development and permitting setback at another enterprise associated with the CEO.

[Hayden Locke management page](<https://marimaca.com/hayden-locke/>) (biography and chair role); [2024 annual results and arbitration](<https://data.fca.org.uk/artefacts/NSM/RNS/5717868.html>) (2024 results, impairment and permit refusal); [2025 audited financial results](<https://www.ticker.app/lse/EML/rns/2026-06-30/Final-Results/4524K>) (2025 results, arbitration claim); [Khemisset arbitration procedural timetable](<https://en.hespress.com/144377-1-215-billion-khemisset-claim-against-morocco-heads-to-2028-hearing.html>) (26 August 2026 report and tribunal timetable)

## Governance and interests

### Concurrent Emmerson arbitration incentive [locke_emm_incentive]

May–June 2026 · issuer reported · medium materiality

Emmerson’s 2025 annual results disclosed a plan allocating 6% of any arbitration compensation to a pool, of which Locke was allocated 22%, conditional on a recovery.

**Attribution:** Individual involvement documented. The contingent award is disclosed; it is not itself evidence of misconduct.

**Relevance:** Shows a concurrent financial interest and another demand on management attention.

[2025 audited financial results](<https://www.ticker.app/lse/EML/rns/2026-06-30/Final-Results/4524K>) (note 19 events after the reporting date, management incentive plan)

## Suitability for the current role

### Role-fit assessment [locke_fit]

October 2026 · analyst inference · medium materiality

The reported background is relevant to chief executive officer and director, subject to the substantial limits of the available screening.

**Attribution:** Responsibility not applicable. Analyst judgment based on the cited roles; not a finding about character.

**Relevance:** Shows the evidence and uncertainty behind the team assessment.

[Hayden Locke management page](<https://marimaca.com/hayden-locke/>) (Hayden Locke biography)

## Evidence gaps

- Independent verification of education, memberships and dates is incomplete.

- Full previous-employer outcomes and person-specific public court, regulatory, safety and environmental records have not been exhaustively reviewed.