Top 5 disclosure deficiencies of NI 43-101 technical report

In practice, disclosure issues do not only affect compliance. They also influence how a project is trusted, reviewed, and valued by investors, lenders, and technical peers.

Why disclosure quality matters in practice

Disclosure is not simply a regulatory requirement. It directly influences how a project is perceived, evaluated, and financed. Investors, lenders, and technical reviewers rely on NI 43-101 reports to understand not only what is known, but also what is uncertain.

When disclosure is incomplete or inconsistent, it creates ambiguity. That ambiguity often leads to additional due diligence, delayed decisions, or reduced confidence—even when the underlying project may be technically sound.

Where disclosure deficiencies typically appear

In practice, disclosure issues are rarely isolated. They tend to appear across multiple sections of a technical report, often reflecting gaps in integration between disciplines or insufficient review before publication.

The most common areas where deficiencies arise include assumptions, methodology, risk disclosure, and consistency across sections.

Unclear or unsupported assumptions

One of the most frequent issues is the presentation of assumptions without sufficient explanation. This includes economic parameters, metallurgical recoveries, mine design inputs, and market assumptions.

Without clear justification, readers cannot assess whether these assumptions are reasonable. This weakens the credibility of the conclusions derived from them.

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Inadequate disclosure of modifying factors

Modifying factors are central to the transition from mineral resources to mineral reserves. However, reports often fail to clearly explain how these factors have been applied or what constraints they introduce.

In practice, this makes it difficult to understand whether the project is realistically developable under the stated conditions.

Weak treatment of project risks

Risk disclosure is frequently underdeveloped. Reports may acknowledge risks but fail to explain their potential impact, likelihood, or mitigation strategies.

This is particularly important in feasibility-stage work, where decisions are being made based on assumptions that may still carry uncertainty.

Methodology not clearly explained

Technical methodologies—whether related to resource estimation, metallurgical testing, or mine planning—must be described clearly enough for a competent reader to understand how results were obtained.

When methodology is vague or incomplete, it raises questions about the reliability of the outputs.

Inconsistency across report sections

Another common issue is inconsistency between different sections of the report. For example, assumptions used in financial modelling may not align with those presented in mine planning or metallurgy.

These inconsistencies are often a sign of insufficient integration or review and can significantly reduce confidence in the report.

Over-reliance on historical information

Historical data can be valuable, but it must be clearly validated and its limitations explicitly disclosed. In practice, some reports rely on legacy data without adequately explaining its reliability or relevance to the current project.

This creates uncertainty around the foundation of the technical work.

Why these issues matter for feasibility studies

Many disclosure deficiencies originate from underlying feasibility work. Weak integration between geology, mining, processing, and economics often translates into weak disclosure.

As projects move from scoping toward bankable level, expectations for clarity and consistency increase significantly. For a deeper understanding of this progression, see our article on From Scoping to Bankable Feasibility Studies.

Cost assumptions also play a key role in disclosure quality. If cost inputs are unclear or poorly supported, financial conclusions become difficult to trust. For more detail, refer to our Feasibility Study Cost Breakdown for Mining Projects.

How disclosure expectations are evolving

Recent discussions around NI 43-101 suggest a continued shift toward greater transparency, clearer accountability, and improved communication of uncertainty.

For a forward-looking perspective, see our article on Proposed NI 43-101 Changes and What They Mean in Practice.

How to improve disclosure quality in practice

Improving disclosure is not only about writing—it is about strengthening the technical foundation of the report. In practice, this means:

• Clearly documenting assumptions and their basis
• Ensuring consistency across all technical disciplines
• Explicitly describing methodologies and limitations
• Providing realistic and transparent risk assessments
• Conducting independent technical review before publication

These steps improve not only compliance, but also the credibility and usefulness of the report.

Conclusion: better disclosure supports better decisions

NI 43-101 disclosure deficiencies are not just technical issues—they are business issues. They influence how projects are understood, trusted, and ultimately financed.

Strong disclosure allows technical work to support decision-making effectively. Weak disclosure introduces uncertainty, even where the project itself may be sound. For the broader context of how feasibility studies support project development, return to our essential guide to mining feasibility studies.

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Frequently Asked Questions (FAQ)

What are NI 43-101 disclosure deficiencies?

They are gaps or weaknesses in how technical information is presented in a report, including unclear assumptions, incomplete methodology, or insufficient risk disclosure.

Why do disclosure deficiencies matter?

They reduce investor confidence, complicate due diligence, and can delay or weaken project financing decisions.

Where do most disclosure issues originate?

Most originate from weak integration between technical disciplines or insufficient validation of assumptions during feasibility study work.

How can disclosure quality be improved?

By strengthening technical integration, clearly documenting assumptions, improving consistency across sections, and conducting independent review before publication.

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Need support with technical reporting or review?

Gosselin Mining supports exploration and mining companies with technical studies, mineral resource work, and independent review aligned with international reporting standards.

If you want to strengthen disclosure quality or review an existing report, contact us to discuss your project.