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When numbers disappear: an unusual event in the exploration market
Corporate announcements in the commodities market are almost always positive: new drilling results, resource increases, partnership agreements. That makes it all the more striking when a junior explorer quietly removes its own resource estimates from its website and publicly states that those figures were never published in an official press release. The episode shows how thin the information base in the small-cap mining sector can be, and why investors need to look carefully at where a resource figure actually comes from when reviewing company websites.
What separates an internally prepared resource estimate from an externally verified technical report? And why does that distinction directly affect how a junior explorer gets valued?
NI 43-101: what the standard actually requires
In Canada, NI 43-101 (National Instrument 43-101) is the binding standard for public disclosure of mineral resources and reserves, including on the TSX Venture Exchange. The standard requires that all publicly disclosed resource estimates be prepared or reviewed by a Qualified Person (QP): an independent, certified geologist or engineer who bears personal responsibility for the accuracy of the data.
Resources classified under this standard fall into three categories:
- Inferred Resources: lowest confidence, based on limited data
- Indicated Resources: moderate confidence, sufficient for feasibility studies
- Measured Resources: highest confidence, requiring dense sampling
Only once economic viability is demonstrated do these resources become Reserves, either Probable or Proven. Resources and reserves are technically distinct concepts and cannot be used interchangeably.
Internal estimates: useful internally, problematic externally
Many junior companies develop their own resource models as part of internal project planning. A geology team calculates, based on historical drilling data, how much mineral might be present in a given area. These figures help management set priorities and plan budgets, and they give investors a rough order of magnitude during roadshows. None of that is inherently wrong.
It becomes a problem when such internal calculations appear on the publicly accessible company website, even without a formal press release. Prospective investors or journalists can easily mistake these figures for disclosures with regulatory backing. Without a clear disclaimer — “This estimate has not been reviewed by an independent QP” — investors may price a stock on a basis that has never been independently verified.
The Qualified Person is no formality. They bear personal liability for the accuracy of their statements, and that accountability is what gives the NI 43-101 process its weight. A number posted on a website carries none of that.
What the withdrawal of resource figures triggers in the market
When a junior explorer withdraws resource estimates, the share price comes under pressure because the figures previously used as a valuation basis no longer exist. Confidence in other company disclosures suffers. Institutional investors, who routinely require QP-certified reports, lose interest, making financing rounds considerably harder.
| Level | Potential market reaction |
|---|---|
| Share valuation | Decline, as the resource figures previously used as a valuation basis are removed |
| Credibility | Increased skepticism toward other company disclosures |
| Capital access | More difficult financing rounds, as institutional investors require QP-certified reports |
| Due diligence burden | Greater scrutiny from analysts and potential partners |
A pattern that comes up repeatedly in acquisition processes: a buyer asks for a QP report for the first time, and the newly calculated resources come in well below the figures the company had been citing for years. Those older numbers were often based on drilling programs from the 1970s, run under methods that no longer meet current standards. The project loses value not because of poor geology, but because no one had previously asked on what basis the numbers rested.
The same applies to terms like “preliminary” or “historical,” which occasionally surface at investor conferences. To newcomers, they sound harmless. In practice, they signal that the cited figures have no regulatory foundation. Anyone unfamiliar with these distinctions ends up valuing a company on a basis that does not hold up under scrutiny.
What investors can check when evaluating junior miners
Every disclosed resource figure should be traced back to its source. In practice: Is there an NI 43-101-compliant technical report for the project filed on SEDAR+? Is an independent Qualified Person named as responsible for the estimate? Are the data current, or are they historical figures not yet verified using modern methods? If these questions go unanswered, treat the disclosed resource figures as unconfirmed.
If a company’s public documents provide no answers here, that is not a neutral signal. The withdrawal of resource figures, rare as it is, at least shows some honesty: the company acknowledges an error rather than continuing to rely on numbers no one has signed off on. A QP-verified estimate of 500,000 ounces of gold is worth more for any investment decision than an internal calculation of five million ounces for which no one bears personal responsibility.
Key terms for getting started with resource valuation
- NI 43-101
- Canadian regulatory standard (National Instrument 43-101) for public disclosure of mineral resources and reserves. Mandatory for all mining companies listed on Canadian stock exchanges.
- Qualified Person (QP)
- An independent, certified professional (geologist or engineer) who, under NI 43-101, bears personal liability for the accuracy of a resource estimate. Without a QP review, there is no regulatorily recognized resource.
- Inferred / Indicated / Measured Resources
- The three confidence classifications for mineral resources under NI 43-101, running from lowest (Inferred) to highest (Measured) data density and reliability. Resources are not reserves.
- Probable / Proven Reserves
- Reserves refer to the economically extractable portion of a deposit. They require demonstrated economic feasibility and must not be equated with resources.
- SEDAR+
- Canada’s System for Electronic Document Analysis and Retrieval. All NI 43-101-compliant technical reports are publicly accessible and verifiable here.
- Historical resource estimate
- Resource figures prepared using outdated methods or without NI 43-101 compliance. They may not be communicated as current, regulatorily recognized resources without explicit disclosure and re-verification.
- Due diligence
- A systematic review of a company or project before an investment decision. In the mining sector, this means above all verifying technical reports, resource classifications, and the qualifications of the professionals involved.
⚠️ Important notice: This article is for informational and educational purposes only. It does not constitute investment advice, a recommendation, or a solicitation to buy or sell any security. Investments in small-cap exploration and mining companies carry a high risk, including the potential total loss of capital. Before making any investment decision, consult a registered financial advisor and conduct your own analysis. Boersen Post Team is not responsible for decisions taken based on the content published here.
