Expert Witness Services

Expert Witness Services for Mining and Engineering

Groff Engineering provides expert witness and litigation support services for mining, mineral valuation, and engineering-related matters.

We deliver independent, technically sound opinions to support attorneys, clients, and courts in complex disputes.

What Does an Engineering Expert Witness Do?

An expert witness provides professional opinions based on specialized knowledge, experience, and analysis.

In mining and engineering cases, this often includes:

• Evaluating technical reports and data
• Reviewing mineral resource and reserve estimates
• Assessing industry standards and compliance
• Providing written expert reports
• Delivering deposition and trial testimony

Our role is to present clear, defensible conclusions grounded in accepted engineering practices.

Areas of Expert Witness Experience

Groff Engineering supports cases involving:

Mineral Reserves and Resource Estimates

• Review of reserve estimates
• Evaluation of Competent Person work
• Assessment of reporting compliance

Mineral Valuation and Royalties

• Disputes involving mineral asset valuation
• Royalty calculation and interpretation
• Appraisal methodology review

Mining Operations and Engineering

• Mine planning and production analysis
• Operational performance and feasibility
• Cost estimation and financial assumptions

Due Diligence and Transactions

• Review of technical due diligence reports
• Evaluation of representations in acquisitions
• Identification of technical and financial risks

Independent, Defensible Expert Opinions

Our expert witness services emphasize:

• Objective, unbiased analysis
• Clear documentation of assumptions and methods
• Alignment with industry standards and best practices
• Reports designed to withstand legal scrutiny

We understand the importance of credibility, clarity, and technical accuracy in legal proceedings.

Litigation Support Services

We work alongside legal teams to provide:

• Expert reports
• Technical analysis and data review
• Deposition preparation and testimony
• Trial support

Our goal is to help attorneys and clients understand complex technical issues and present them effectively.

Why Choose Groff Engineering?

• Licensed Professional Engineer in multiple jurisdictions
• Certified Minerals Appraiser (CMA)
• Expertise in reserve reporting (JORC, NI 43-101, S-K 1300)
• Experience in valuation, due diligence, and mine engineering
• Clear, defensible communication of technical findings

Applications of Expert Witness Services

Our services are commonly used in:

• Litigation and arbitration
• Contract and royalty disputes
• Mining asset valuation disputes
• Condemnation cases