Mineral Reserves

Mineral Reserve Reporting & Technical Services

Groff Engineering provides mineral reserve reporting and technical consulting services in accordance with internationally recognized standards. Our work supports mining companies, investors, and lenders who require accurate, defensible reserve estimates.

What is a Mineral Reserve?

A mineral reserve represents the economically mineable portion of a mineral resource, demonstrated through feasibility analysis and supported by engineering, economic, and regulatory considerations.

Reserve estimates are designed to reflect what can realistically be mined, not hypothetical outcomes.

CRIRSCO- and SEC-Compliant Reserve Reporting

Brian Groff is a Competent Person qualified to prepare mineral reserve estimates under both international and U.S. regulatory frameworks, including:

  • JORC (Australasian Code)
  • NI 43-101 (Canada)
  • PERC (Europe)
  • SAMREC (South Africa)
  • SEC Regulation S-K 1300 (United States)

These standards ensure:

  • Transparency in public disclosure
  • Consistency across jurisdictions
  • confidence for investors, lenders, and regulators through clear, transparent reporting.

S-K 1300 governs how mineral resources and reserves are reported by companies listed with the U.S. Securities and Exchange Commission (SEC), requiring qualified professionals, robust technical studies, and full disclosure of assumptions.

Groff Engineering also contributes to industry standards through participation in the Society for Mining, Metallurgy & Exploration (SME) Resource and Reserves Committee.

Accurate and Defensible Reserve Estimates

We approach reserve reporting with a focus on real-world mineability and financial feasibility.

Our methodology emphasizes:

  • Conservative, evidence-based assumptions
  • Compliance with CRIRSCO and S-K 1300 reporting requirements
  • Practical mine planning considerations

Our reports are designed to withstand review by:

  • Investors
  • Regulatory agencies
  • Lenders’ Technical Advisors (LTA)

In multiple cases, our reserve work has been independently reviewed and accepted by lender technical teams, demonstrating a high level of confidence.

Exploration & Geological Services

In addition to reserve reporting, Groff Engineering supports exploration and due diligence programs, including:

  • Exploration drilling management
  • Core drilling coordination
  • Core logging and geological analysis
  • Laboratory testing oversight

These services provide the technical foundation needed for reliable resource and reserve estimation.

Applications of Mineral Reserve Reporting

Our mineral reserve services are commonly used for:

  • Feasibility studies
  • SEC filings under S-K 1300
  • Project financing and lending
  • Investor disclosures
  • Mergers and acquisitions
  • Regulatory compliance

Why Choose Groff Engineering?

  • Qualified Competent Person under CRIRSCO and S-K 1300
  • Experience with international and U.S. reporting frameworks
  • Active contributor to SME reporting guidelines
  • Proven track record with lender-reviewed reports
  • Integrated engineering and geological expertise