# Mark Wall Chief Executive Officer / President ## Career chronology - **Barrick 2006–2018; interim Veladero appointment September 2016; exact end date unknown: Barrick Gold / Veladero** — Senior operational executive; interim Veladero manager after September 2016 incident. [Mountain Province appoints Mark Wall]() (CEO career narrative); [Inquietud por un nuevo derrame de cianuro de la Barrick en San Juan]() (16 September 2016 replacement following incident); [Former colleague account of Barrick and ARR CEO]() (former colleague linked ARR CEO to Barrick and Veladero); [Veladero incident and interim management change]() (16 September 2016, reported interim general manager replacement); [2024 Annual Information Form]() (p. 33, Veladero general manager career) - **Before August 2020; exact role dates not independently established: Nevada Copper** — Chief Commercial Officer, then Chief Operating Officer. [Mountain Province appoints Mark Wall]() (prior Nevada Copper roles) - **2020–2021; exact end date not established: Streamers Gold Mining** — Chief Executive Officer. [Mountain Province appoints Mark Wall]() (prior Streamers role) - **15 November 2021–19 December 2025: Mountain Province Diamonds** — President, CEO and director. [Mountain Province appoints Mark Wall]() (effective date); [Mountain Province leadership and operational update]() (departure date); [Mark Wall executive profile]() (identity linkage to ARR CEO) - **CEO effective 5 January 2026; combined title 2 March 2026: American Rare Earths** — CEO and President. [Appointment of Mark Wall as Chief Executive Officer]() (CEO effective date); [American Rare Earths consolidates President and CEO roles]() (combined title) ## Contributions and company outcomes ### Halleck Creek technical advancement remains pre-production [mark_wall_project_milestones] December 2025–September 2026 · issuer reported · high materiality ARR reported mixed rare earth oxide production from test work in the December 2025 quarter, before this executive joined; in the September 2026 quarter it reported completing feasibility-stage drilling and commencing ore crushing for its pilot program. No operating mine or commercial production has been delivered. **Attribution:** Responsibility not applicable. The 2025 milestone predates the executive’s appointment; subsequent issuer-reported company work is not individually attributed. **Relevance:** Relevant to project execution; progress remains at study/pilot stage. [Quarterly Activities and Appendix 5B for September 2026]() (pp. 1–3, September quarter operational update); [Quarterly activities for December 2025]() (pp. 1–2, mixed oxide test work) ## Business failures and setbacks ### Development-stage losses and no producing operation [mark_wall_preproduction] Through 30 June 2026 · issuer reported · medium materiality ARR remains a pre-revenue rare earth developer with no operating mine; financial reports describe continued exploration, studies, processing test work and capital needs. This is a company-stage limitation, not evidence of personal failure. **Attribution:** Role overlaps event; causation unproven. Company performance overlaps current tenure for some executives; no individual causation demonstrated. **Relevance:** Material context for delivery track record and capital stewardship. [Annual Report to shareholders, year ended 30 June 2025]() (financial statements and going-concern/project sections); [Half Yearly Report and Accounts, six months ended 31 December 2025]() (financial statements and operations); [Quarterly Activities Report for period ended 30 June 2026]() (quarterly activities and cashflow) ### Prior diamond-company losses during CEO tenure [mark_wall_mountain_loss] Q3 2025 · documented · high materiality Mountain Province reported a C$55.9 million net loss in Q3 2025 versus C$19.0 million in Q3 2024. It cited softer rough-diamond sales, operating grade effects and foreign exchange; it reported Q3 2025 revenue C$29.2 million versus C$69.4 million a year earlier. **Attribution:** Role overlaps event; causation unproven. Wall was CEO during the period; the mine was operated by a joint venture and the figures reflect market and other factors. No personal causation is established. **Relevance:** Financial and operating context for a senior mining leadership record. [Mark Wall executive profile]() (identity linkage); [Mountain Province appoints Mark Wall]() (CEO appointment); [Mountain Province third quarter 2025 financial results]() (financial and operating highlights) ## Environmental record ### Veladero incident and subsequent management role [mark_wall_veladero_context] September 2016–2017 · documented · high materiality At Veladero, Barrick reported a September 2016 release of ore saturated with process solution and a temporary suspension. Contemporary reporting says Mark Wall was appointed interim general manager after that incident. Barrick reported a later administrative fine encompassing the September 2016 and March 2017 incidents; it stated material from the 2016 incident was contained on site and its monitoring found no environmental impact. **Attribution:** Employer context; no individual link established. The September 2016 event preceded Wall’s interim appointment according to contemporary reporting. His exact end date and his responsibility for any later incident are not established; neither culpability nor environmental clearance is inferred. **Relevance:** Relevant context for prior operating and environmental oversight; timing is material. [Mark Wall executive profile]() (identity linkage); [Inquietud por un nuevo derrame de cianuro de la Barrick en San Juan]() (appointment following September event); [Barrick Gold 2017 annual financial report]() (Veladero incidents and regulatory proceeding); [Former colleague account of Barrick and ARR CEO]() (colleague identifies ARR CEO with Barrick Veladero team); [Veladero incident and interim management change]() (16 September 2016, appointment after incident) ## Suitability for the current role ### Background relevant to current remit [mark_wall_experience] Career through cutoff · analyst inference · medium materiality An executive profile links ARR’s CEO to Mountain Province Diamonds’ 2021–2025 CEO Mark Wall; a former Barrick colleague also identifies ARR’s CEO as his former teammate. The former issuer reports leadership at Barrick, Nevada Copper and Streamers Gold, and lists business and management degrees and a minerals-processing diploma; independent credential checks remain unavailable. ARR’s annual report says his employment began on 22 December 2025, while the appointment release says the CEO role was effective 5 January 2026. **Attribution:** Responsibility not applicable. Issuer biography/appointment material provides this background; independent qualification and career verification are incomplete. **Relevance:** Relevant to current role, with depth varying by available published evidence. [Mark Wall executive profile]() (profile linking ARR and Mountain Province); [Mountain Province appoints Mark Wall]() (career and appointment); [2024 Annual Information Form]() (p. 33, qualifications and career); [Appointment of Mark Wall as Chief Executive Officer]() (effective date); [2026 Annual Report]() (remuneration report, CEO appointment date); [Former colleague account of Barrick and ARR CEO]() (colleague identity corroboration) ## Evidence gaps - ARR’s published CEO announcement does not identify his earlier employers by name; the link to Mountain Province relies on a secondary profile, supported by the consistent role history and dates. - Degree awarding institutions and independent credentials were not identified. - Exact Veladero operating end date and final proceedings specific to the 2016/2017 incidents were not established. - Open-source screening is not an exhaustive criminal, sanctions, litigation, regulatory or credential check.