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2026-11-06
◂ Monitor TSO ASX

Tesoro Gold Limited

PFS Developer · Gold · CL Rating locked: sign in to view v8.1 · tso-20261030t220329-full
Last 2026-11-06
A$0.74
1D
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1M
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YTD
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1Y
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Fair value
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Upside
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Mkt cap
A$133M
EV
A$124.1M
Cash
A$9.3M
Debt
A$0
3 newer ASX announcements not yet reflected in this valuation

People, delivery and responsibility

Management background checks

Evidence through 2026-10-31

Decision-relevant facts

Material summary

Individual involvement and employer context shown separately

Zeffron (Zeff) Reeves

Managing Director

Current
Full background report for Zeffron (Zeff) Reeves
Personal SuccessIssuer Reported · Medium materiality

Relevant professional experience

Geologist with 25+ years across resources; former MD of Metallum with Chile development/operating projects and prior Brazil project leadership.

Individual involvement documented · The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Board and Management · Zeff Reeves profile; career/role section
Role FitAnalyst Inference · Medium materiality

Role fit and evidence limits

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Responsibility not applicable · This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Board and Management · Zeff Reeves profile; career/role section
LegalAlleged · High materiality

Wanaco litigation included a dismissal and a later criminal complaint

Tesoro reported dismissal of the initial Wanaco civil case in August 2025; its June 2026 half-year report states Wanaco appealed and ancillary proceedings remained. Separately, a September 2025 news report says a criminal complaint named Reeves and Uribe and reproduces a law-firm denial. The underlying complaint, any individual response and final case outcomes were not obtained.

Individual involvement documented · News reporting names this person in a complaint; allegations are not findings. The civil dismissal does not resolve the separate criminal complaint.

Empresarios mineros presentan querella por prevaricación · 25 September 2025 report, complaint and law-firm response
Evidence gaps · 3
  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.
  • Exact role dates and cutoff continuity need dated corroboration.
  • The original criminal complaint, response by named individuals and final criminal/civil outcomes remain unverified.

Full background report

Zeffron (Zeff) Reeves

Managing Director

Career chronology

  • Earlier career; exact dates not established: Prior employers as stated in official or reviewed professional profile — Geologist with 25+ years across resources; former MD of Metallum with Chile development/operating projects and prior Brazil project leadership.. Board and Management (Zeff Reeves profile; career/role section)

Education and qualifications

Issuer-reported qualifications

Disclosed September 2021; award and membership dates unverified · issuer reported · low materiality

Culpeo’s 2021 announcement states Reeves holds a Bachelor of Applied Geology with honours, a Curtin University MBA, and membership of the Australian Institute of Geoscientists.

Attribution: Individual involvement documented. These are issuer-reported qualifications and membership; graduation dates and independent institution or register confirmation remain unverified.

Relevance: Relevant to the geological and corporate experience required in his role.

Culpeo Minerals first day of trade (p.2, Zeffron Reeves biography)

Personal achievements

Relevant professional experience

Earlier career; exact dates not established in reviewed profile · issuer reported · medium materiality

Geologist with 25+ years across resources; former MD of Metallum with Chile development/operating projects and prior Brazil project leadership.

Attribution: Individual involvement documented. The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Relevance: Provides role-relevant experience; profile claims are issuer-reported and not a substitute for independent delivery evidence.

Board and Management (Zeff Reeves profile; career/role section)

Litigation and enforcement

Wanaco litigation included a dismissal and a later criminal complaint

2021–2026; later case outcomes unverified · alleged · high materiality

Tesoro reported dismissal of the initial Wanaco civil case in August 2025; its June 2026 half-year report states Wanaco appealed and ancillary proceedings remained. Separately, a September 2025 news report says a criminal complaint named Reeves and Uribe and reproduces a law-firm denial. The underlying complaint, any individual response and final case outcomes were not obtained.

Attribution: Individual involvement documented. News reporting names this person in a complaint; allegations are not findings. The civil dismissal does not resolve the separate criminal complaint.

Relevance: Material governance and legal exposure in the executive’s Chilean project and partner relations; distinguish the first-instance civil win from unresolved appeals/ancillary cases and the separate criminal complaint.

Half-year financial report, 30 June 2026 (Note 7, pp.29–30); Empresarios mineros presentan querella por prevaricación (25 September 2025 report, complaint and law-firm response)

Suitability for the current role

Role fit and evidence limits

Assessment at cutoff 2026-10-31 · analyst inference · medium materiality

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Attribution: Responsibility not applicable. This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Relevance: Connects prior experience to the role’s execution and oversight needs.

Board and Management (Zeff Reeves profile; career/role section)

Evidence gaps

  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.

  • Exact role dates and cutoff continuity need dated corroboration.

  • The original criminal complaint, response by named individuals and final criminal/civil outcomes remain unverified.

Linton Putland

Executive Director - Mining and Development

Current
Full background report for Linton Putland
Personal SuccessIssuer Reported · Medium materiality

Relevant professional experience

35+ years in operations, JVs and corporate management; senior roles at IAMGOLD, Aurion, Delta and Pancontinental; mining consultancy principal.

Individual involvement documented · The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Board and Management · Linton Putland profile; career/role section
Role FitAnalyst Inference · Medium materiality

Role fit and evidence limits

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Responsibility not applicable · This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Board and Management · Linton Putland profile; career/role section
Evidence gaps · 2
  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.
  • Exact role dates and cutoff continuity need dated corroboration.

Full background report

Linton Putland

Executive Director - Mining and Development

Career chronology

  • Earlier career; exact dates not established: Prior employers as stated in official or reviewed professional profile — 35+ years in operations, JVs and corporate management; senior roles at IAMGOLD, Aurion, Delta and Pancontinental; mining consultancy principal.. Board and Management (Linton Putland profile; career/role section)

Education and qualifications

Education and professional credentials

Credential history; dates not disclosed in reviewed source · issuer reported · low materiality

Tesoro’s 2023 notice says Putland holds a Bachelor of Engineering in mining and a Master of Science in mineral economics from the Western Australian School of Mines, and is an AusIMM member and AICD graduate member.

Attribution: Individual involvement documented. These are issuer-reported qualifications and memberships; dates and independent institution or register confirmation remain unverified.

Relevance: Relevant to the technical, finance or governance responsibilities described in the current role.

2023 notice of annual general meeting (printed p.7, Qualifications and other material directorships)

Personal achievements

Relevant professional experience

Earlier career; exact dates not established in reviewed profile · issuer reported · medium materiality

35+ years in operations, JVs and corporate management; senior roles at IAMGOLD, Aurion, Delta and Pancontinental; mining consultancy principal.

Attribution: Individual involvement documented. The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Relevance: Provides role-relevant experience; profile claims are issuer-reported and not a substitute for independent delivery evidence.

Board and Management (Linton Putland profile; career/role section)

Suitability for the current role

Role fit and evidence limits

Assessment at cutoff 2026-10-31 · analyst inference · medium materiality

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Attribution: Responsibility not applicable. This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Relevance: Connects prior experience to the role’s execution and oversight needs.

Board and Management (Linton Putland profile; career/role section)

Evidence gaps

  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.

  • Exact role dates and cutoff continuity need dated corroboration.

Emma Curnow

Chief Financial Officer

Current
Full background report for Emma Curnow
Personal SuccessIssuer Reported · Medium materiality

Relevant professional experience

Senior finance roles at Inca Minerals, Norwest Energy, Paringa Resources and Chariot Oil & Gas; corporate advisory experience.

Individual involvement documented · The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Board and Management · Emma Curnow profile; career/role section
Role FitAnalyst Inference · Medium materiality

Role fit and evidence limits

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Responsibility not applicable · This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Board and Management · Emma Curnow profile; career/role section
Evidence gaps · 3
  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.
  • Exact role dates and cutoff continuity need dated corroboration.
  • Paringa role start and departure dates, and whether the role overlapped its U.S. subsidiary’s 2020 Chapter 11 proceedings, remain unverified; no responsibility for those proceedings is established.

Full background report

Emma Curnow

Chief Financial Officer

Career chronology

  • Earlier career; exact dates not established: Prior employers as stated in official or reviewed professional profile — Senior finance roles at Inca Minerals, Norwest Energy, Paringa Resources and Chariot Oil & Gas; corporate advisory experience.. Board and Management (Emma Curnow profile; career/role section)

  • Recorded in the 2013 annual report; start and end dates unverified: Paringa Resources Limited — Financial Controller. Annual report for year ended 30 June 2013 (remuneration report, other key management personnel)

Education and qualifications

Education and professional credentials

Credential history; dates not disclosed in reviewed source · issuer reported · low materiality

Chartered Accountant; Bachelor of Commerce, University of Western Australia; Governance Institute member.

Attribution: Individual involvement documented. The profile identifies the stated qualifications; graduation dates and independent register verification were not located.

Relevance: Relevant to the technical, finance or governance responsibilities described in the current role.

Board and Management (Emma Curnow profile; career/role section)

Personal achievements

Relevant professional experience

Earlier career; exact dates not established in reviewed profile · issuer reported · medium materiality

Senior finance roles at Inca Minerals, Norwest Energy, Paringa Resources and Chariot Oil & Gas; corporate advisory experience.

Attribution: Individual involvement documented. The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Relevance: Provides role-relevant experience; profile claims are issuer-reported and not a substitute for independent delivery evidence.

Board and Management (Emma Curnow profile; career/role section)

Suitability for the current role

Role fit and evidence limits

Assessment at cutoff 2026-10-31 · analyst inference · medium materiality

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Attribution: Responsibility not applicable. This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Relevance: Connects prior experience to the role’s execution and oversight needs.

Board and Management (Emma Curnow profile; career/role section)

Evidence gaps

  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.

  • Exact role dates and cutoff continuity need dated corroboration.

  • Paringa role start and departure dates, and whether the role overlapped its U.S. subsidiary’s 2020 Chapter 11 proceedings, remain unverified; no responsibility for those proceedings is established.

Tim Williams

Chief Development Officer

Current
Full background report for Tim Williams
Personal SuccessIssuer Reported · Medium materiality

Relevant professional experience

Senior/COO roles with Rio Alto, Rio2 and Marathon Gold; profile says he led development of multiple gold mines from concept to operation.

Individual involvement documented · The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Board and Management · Tim Williams profile; career/role section
Role FitAnalyst Inference · Medium materiality

Role fit and evidence limits

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Responsibility not applicable · This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Board and Management · Tim Williams profile; career/role section
Company SuccessDocumented · Medium materiality

Valentine development and later first gold

Marathon appointed Williams COO in 2020 and announced a replacement effective 1 October 2023, while saying he would provide consulting support. Equinox reported Valentine’s first gold on 14 September 2025.

Role overlaps event; causation unproven · Williams held the COO role during early project development; the reported first pour occurred after his replacement. The duration of subsequent consulting and his individual contribution to that milestone are unverified.

Marathon Gold announces management appointments · management appointment and planned consulting
Equinox Gold delivers first gold at Valentine · first gold announcement, 15 September 2025
Evidence gaps · 3
  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.
  • Exact role dates and cutoff continuity need dated corroboration.
  • Valentine consulting duration, individual contribution to the 2025 first gold, and project outcomes during his exact tenure remain unverified.

Full background report

Tim Williams

Chief Development Officer

Career chronology

  • Earlier career; exact dates not established: Prior employers as stated in official or reviewed professional profile — Senior/COO roles with Rio Alto, Rio2 and Marathon Gold; profile says he led development of multiple gold mines from concept to operation.. Board and Management (Tim Williams profile; career/role section)

  • Appointed July 2020; replacement COO effective 1 October 2023; planned consulting thereafter: Marathon Gold Corporation — Chief Operating Officer. Marathon Gold appoints Tim Williams chief operating officer (appointment announcement, July 2020); Marathon Gold announces management appointments (management announcement, 13 September 2023)

Education and qualifications

Education and professional credentials

Credential history; dates not disclosed in reviewed source · issuer reported · low materiality

BEng Science in Mine Geology; Graduate Diploma Mining Engineering; master’s in Mining Geomechanics, WASM/Curtin.

Attribution: Individual involvement documented. The profile identifies the stated qualifications; graduation dates and independent register verification were not located.

Relevance: Relevant to the technical, finance or governance responsibilities described in the current role.

Board and Management (Tim Williams profile; career/role section)

Personal achievements

Relevant professional experience

Earlier career; exact dates not established in reviewed profile · issuer reported · medium materiality

Senior/COO roles with Rio Alto, Rio2 and Marathon Gold; profile says he led development of multiple gold mines from concept to operation.

Attribution: Individual involvement documented. The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Relevance: Provides role-relevant experience; profile claims are issuer-reported and not a substitute for independent delivery evidence.

Board and Management (Tim Williams profile; career/role section)

Contributions and company outcomes

Valentine development and later first gold

2020–September 2025 · documented · medium materiality

Marathon appointed Williams COO in 2020 and announced a replacement effective 1 October 2023, while saying he would provide consulting support. Equinox reported Valentine’s first gold on 14 September 2025.

Attribution: Role overlaps event; causation unproven. Williams held the COO role during early project development; the reported first pour occurred after his replacement. The duration of subsequent consulting and his individual contribution to that milestone are unverified.

Relevance: A dated project-development track record provides context for his current development role.

Marathon Gold appoints Tim Williams chief operating officer (appointment announcement); Marathon Gold announces management appointments (management appointment and planned consulting); Equinox Gold delivers first gold at Valentine (first gold announcement, 15 September 2025)

Suitability for the current role

Role fit and evidence limits

Assessment at cutoff 2026-10-31 · analyst inference · medium materiality

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Attribution: Responsibility not applicable. This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Relevance: Connects prior experience to the role’s execution and oversight needs.

Board and Management (Tim Williams profile; career/role section)

Evidence gaps

  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.

  • Exact role dates and cutoff continuity need dated corroboration.

  • Valentine consulting duration, individual contribution to the 2025 first gold, and project outcomes during his exact tenure remain unverified.

Sergio Uribe

Country Manager Chile

Current
Full background report for Sergio Uribe
Personal SuccessIssuer Reported · Medium materiality

Relevant professional experience

Former Commercial Manager at Metallum Chile, GM at Acorn Mining Chile and Country Manager at Cleveland Mining Chile; exposure to mining lifecycle and Pilbara development team.

Individual involvement documented · The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Board and Management · Sergio Uribe profile; career/role section
Role FitAnalyst Inference · Medium materiality

Role fit and evidence limits

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Responsibility not applicable · This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Board and Management · Sergio Uribe profile; career/role section
LegalAlleged · High materiality

Wanaco litigation included a dismissal and a later criminal complaint

Tesoro reported dismissal of the initial Wanaco civil case in August 2025; its June 2026 half-year report states Wanaco appealed and ancillary proceedings remained. Separately, a September 2025 news report says a criminal complaint named Reeves and Uribe and reproduces a law-firm denial. The underlying complaint, any individual response and final case outcomes were not obtained.

Individual involvement documented · News reporting names this person in a complaint; allegations are not findings. The civil dismissal does not resolve the separate criminal complaint.

Empresarios mineros presentan querella por prevaricación · 25 September 2025 report, complaint and law-firm response
Evidence gaps · 3
  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.
  • Exact role dates and cutoff continuity need dated corroboration.
  • The original criminal complaint, response by named individuals and final criminal/civil outcomes remain unverified.

Full background report

Sergio Uribe

Country Manager Chile

Career chronology

  • Earlier career; exact dates not established: Prior employers as stated in official or reviewed professional profile — Former Commercial Manager at Metallum Chile, GM at Acorn Mining Chile and Country Manager at Cleveland Mining Chile; exposure to mining lifecycle and Pilbara development team.. Board and Management (Sergio Uribe profile; career/role section)

Education and qualifications

Education and professional credentials

Credential history; dates not disclosed in reviewed source · issuer reported · low materiality

Business Management degree, Universidad del Desarrollo.

Attribution: Individual involvement documented. The profile identifies the stated qualifications; graduation dates and independent register verification were not located.

Relevance: Relevant to the technical, finance or governance responsibilities described in the current role.

Board and Management (Sergio Uribe profile; career/role section)

Personal achievements

Relevant professional experience

Earlier career; exact dates not established in reviewed profile · issuer reported · medium materiality

Former Commercial Manager at Metallum Chile, GM at Acorn Mining Chile and Country Manager at Cleveland Mining Chile; exposure to mining lifecycle and Pilbara development team.

Attribution: Individual involvement documented. The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Relevance: Provides role-relevant experience; profile claims are issuer-reported and not a substitute for independent delivery evidence.

Board and Management (Sergio Uribe profile; career/role section)

Litigation and enforcement

Wanaco litigation included a dismissal and a later criminal complaint

2021–2026; later case outcomes unverified · alleged · high materiality

Tesoro reported dismissal of the initial Wanaco civil case in August 2025; its June 2026 half-year report states Wanaco appealed and ancillary proceedings remained. Separately, a September 2025 news report says a criminal complaint named Reeves and Uribe and reproduces a law-firm denial. The underlying complaint, any individual response and final case outcomes were not obtained.

Attribution: Individual involvement documented. News reporting names this person in a complaint; allegations are not findings. The civil dismissal does not resolve the separate criminal complaint.

Relevance: Material governance and legal exposure in the executive’s Chilean project and partner relations; distinguish the first-instance civil win from unresolved appeals/ancillary cases and the separate criminal complaint.

Half-year financial report, 30 June 2026 (Note 7, pp.29–30); Empresarios mineros presentan querella por prevaricación (25 September 2025 report, complaint and law-firm response)

Suitability for the current role

Role fit and evidence limits

Assessment at cutoff 2026-10-31 · analyst inference · medium materiality

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Attribution: Responsibility not applicable. This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Relevance: Connects prior experience to the role’s execution and oversight needs.

Board and Management (Sergio Uribe profile; career/role section)

Evidence gaps

  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.

  • Exact role dates and cutoff continuity need dated corroboration.

  • The original criminal complaint, response by named individuals and final criminal/civil outcomes remain unverified.

Sarah Wilson

Company Secretary

Current
Full background report for Sarah Wilson
Personal SuccessIssuer Reported · Medium materiality

Relevant professional experience

The 2025 appointment announcement reports more than 12 years of corporate advisory and governance experience.

Individual involvement documented · The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Change of company secretary · p.1, appointment and professional experience
Role FitAnalyst Inference · Medium materiality

Role fit and evidence limits

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Responsibility not applicable · This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Change of company secretary · p.1, appointment and professional experience
Evidence gaps · 3
  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.
  • Exact role dates and cutoff continuity need dated corroboration.
  • Tesoro’s site contains two same-name secretary biographies and its 2024 resignation and 2025 appointment do not independently establish whether the two officeholders are the same person. The certificate and membership shown in the older biography are withheld until identity and credentials are verified.

Full background report

Sarah Wilson

Company Secretary

Career chronology

  • Earlier career; exact dates not established: Prior employers as stated in official or reviewed professional profile — Issuer-reported corporate advisory and governance experience; earlier positions and dates need identity reconciliation.. Change of company secretary (p.1, professional experience)

Personal achievements

Relevant professional experience

Earlier career; exact dates not established in reviewed profile · issuer reported · medium materiality

The 2025 appointment announcement reports more than 12 years of corporate advisory and governance experience.

Attribution: Individual involvement documented. The cited profile describes the person’s roles and involvement; outcome attribution is limited to what it explicitly states.

Relevance: Provides role-relevant experience; profile claims are issuer-reported and not a substitute for independent delivery evidence.

Change of company secretary (p.1, appointment and professional experience)

Suitability for the current role

Role fit and evidence limits

Assessment at cutoff 2026-10-31 · analyst inference · medium materiality

The issuer-reported career has potential relevance to the current role; prior outcomes and individual contribution need independent verification.

Attribution: Responsibility not applicable. This is an analytical inference from the cited career profile and the company’s stated stage; it does not claim personal causation of company outcomes.

Relevance: Connects prior experience to the role’s execution and oversight needs.

Change of company secretary (p.1, appointment and professional experience)

Evidence gaps

  • This is partial screening; independent career, qualifications, former-employer, legal, safety, fraud, environmental and governance checks remain incomplete.

  • Exact role dates and cutoff continuity need dated corroboration.

  • Tesoro’s site contains two same-name secretary biographies and its 2024 resignation and 2025 appointment do not independently establish whether the two officeholders are the same person. The certificate and membership shown in the older biography are withheld until identity and credentials are verified.